{"id":4397,"date":"2026-09-01T15:39:50","date_gmt":"2026-09-01T07:39:50","guid":{"rendered":"https:\/\/cnkuangya.com\/?p=4397"},"modified":"2026-09-01T15:59:10","modified_gmt":"2026-09-01T07:59:10","slug":"solar-inverter-built-in-spd","status":"publish","type":"post","link":"https:\/\/cnkuangya.com\/fr\/blog\/solar-inverter-built-in-spd\/","title":{"rendered":"L'onduleur solaire dispose d'un parafoudre CC int\u00e9gr\u00e9 : avez-vous toujours besoin d'un parafoudre externe ?"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Un parafoudre int\u00e9gr\u00e9 \u00e0 un onduleur solaire peut offrir une protection importante contre les surtensions, mais la mention \u201c parafoudre CC de type II \u201d sur la fiche technique ne signifie pas automatiquement que l'ensemble du syst\u00e8me photovolta\u00efque est prot\u00e9g\u00e9.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Parfois, la sp\u00e9cification indique m\u00eame :<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Parafoudre CC et CA de type II int\u00e9gr\u00e9<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Au premier abord, la conclusion semble \u00e9vidente :<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u201c L'onduleur dispose d\u00e9j\u00e0 d'une protection contre les surtensions. Pourquoi devrais-je installer un autre parafoudre ? \u201d<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Ensuite, vous examinez un coffret de jonction photovolta\u00efque et y trouvez un autre parafoudre CC.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ou bien un installateur vous indique qu'un parafoudre suppl\u00e9mentaire doit \u00eatre install\u00e9 \u00e0 proximit\u00e9 du champ photovolta\u00efque.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La question devient maintenant confuse.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Deux parafoudres (SPD) effectuent-ils la m\u00eame fonction ?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Le parafoudre externe est-il inutile ?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ou bien le parafoudre int\u00e9gr\u00e9 \u00e0 l'onduleur ne prot\u00e8ge-t-il qu'une partie du syst\u00e8me photovolta\u00efque ?<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">R\u00e9ponse rapide<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Un parafoudre CC int\u00e9gr\u00e9 ne signifie pas automatiquement qu'aucun parafoudre externe n'est n\u00e9cessaire.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La r\u00e9ponse r\u00e9elle d\u00e9pend de :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>quel type de parafoudre est r\u00e9ellement int\u00e9gr\u00e9 dans l'onduleur ;<\/li>\n\n\n\n<li>s'il est install\u00e9 du c\u00f4t\u00e9 CC, du c\u00f4t\u00e9 CA, ou des deux c\u00f4t\u00e9s ;<\/li>\n\n\n\n<li>la distance entre le champ photovolta\u00efque et l'onduleur ;<\/li>\n\n\n\n<li>si un coffret de jonction photovolta\u00efque est utilis\u00e9 ;<\/li>\n\n\n\n<li>si le b\u00e2timent est \u00e9quip\u00e9 d'un syst\u00e8me de protection contre la foudre externe ;<\/li>\n\n\n\n<li>si la distance de s\u00e9paration requise peut \u00eatre maintenue ;<\/li>\n\n\n\n<li>et ce que sp\u00e9cifient le fabricant de l'onduleur et les exigences applicables au projet.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">La question cl\u00e9 n'est donc pas :<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>\u201c Mon onduleur est-il \u00e9quip\u00e9 d'un parafoudre (SPD) ? \u201d<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Une meilleure question est :<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>\u201cO\u00f9 se trouve le parafoudre (SPD), quelle partie du syst\u00e8me prot\u00e8ge-t-il et que se passe-t-il avant qu'une surtension n'atteigne ce point ?\u201d<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Ce changement de perspective rend ce sujet beaucoup plus facile \u00e0 comprendre.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Parafoudre int\u00e9gr\u00e9 : ce qu'il vous indique \u2014 et ce qu'il ne vous dit pas<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Lors de la lecture de la fiche technique d'un onduleur, les termes <strong>\u201c parafoudre int\u00e9gr\u00e9 \u201d<\/strong> fournissent des informations utiles, mais ne vous disent pas tout ce que vous devez savoir.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>La sp\u00e9cification de l'onduleur indique<\/th><th>Ce que vous savez<\/th><th>Ce qu'il reste \u00e0 v\u00e9rifier<\/th><\/tr><\/thead><tbody><tr><td>DC Type 2 SPD<\/td><td>Une protection contre les surtensions de type 2 est pr\u00e9sente c\u00f4t\u00e9 courant continu (DC) PV<\/td><td>Emplacement, calibres, longueur de c\u00e2ble, syst\u00e8me de protection contre la foudre (LPS) externe et n\u00e9cessit\u00e9 d'un point de protection suppl\u00e9mentaire<\/td><\/tr><tr><td>AC Type 2 SPD<\/td><td>Une protection contre les surtensions est pr\u00e9sente c\u00f4t\u00e9 courant alternatif (AC) de l'onduleur<\/td><td>Cela ne confirme pas la protection c\u00f4t\u00e9 courant continu (DC)<\/td><\/tr><tr><td>Parafoudre (SPD) de type 2 pour DC + AC<\/td><td>Les c\u00f4t\u00e9s DC et AC disposent tous deux d'une protection contre les surtensions au niveau de l'onduleur<\/td><td>Les longs trac\u00e9s de c\u00e2bles et autres points d'installation doivent encore \u00eatre \u00e9valu\u00e9s<\/td><\/tr><tr><td>Parafoudre CC type 1+2<\/td><td>La protection CC dispose d'une capacit\u00e9 de protection contre la foudre et les surtensions adapt\u00e9e au type d\u00e9clar\u00e9<\/td><td>L'emplacement et le concept complet de protection contre la foudre restent essentiels<\/td><\/tr><tr><td>\u201c Protection contre les surtensions \u201d uniquement<\/td><td>Une fonction de protection contre les surtensions est revendiqu\u00e9e<\/td><td>Le type r\u00e9el de parafoudre, son c\u00f4t\u00e9 d'installation, ses caract\u00e9ristiques nominales et sa rempla\u00e7abilit\u00e9 peuvent rester flous<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Voici la premi\u00e8re le\u00e7on pratique :<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Voir \u201c SPD \u201d dans la fiche technique d'un onduleur n'est que la premi\u00e8re \u00e9tape. V\u00e9rifiez le type de parafoudre, s'il est install\u00e9 c\u00f4t\u00e9 CC ou CA, ainsi que ses sp\u00e9cifications techniques r\u00e9elles.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<div class=\"kuangya-spd-quiz\" id=\"kuangya-spd-label-quiz\">\n\n  <div class=\"kuangya-spd-quiz-header\">\n    <h2>Examen rapide de l'\u00e9tiquette d'un parafoudre (SPD) en 30 secondes<\/h2>\n    <p>\n      Avant d'aborder les parafoudres int\u00e9gr\u00e9s aux onduleurs, examinons rapidement l'\u00e9tiquette d'un parafoudre CC r\u00e9el.\n    <\/p>\n  <\/div>\n\n  <div class=\"kuangya-spd-quiz-wrap\">\n\n    <!-- Real KUANGYA SPD Image -->\n    <div class=\"kuangya-spd-quiz-image\">\n      <img\n        src=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/kuangya-dc-spd-type2-1000v-label.jpg\"\n        alt=\"KUANGYA Type 2 DC SPD 1000V label showing Uc In Imax and Up\"\n        width=\"600\"\n        height=\"816\"\n        loading=\"lazy\"\n        decoding=\"async\"\n      >\n      <p class=\"quiz-image-caption\">\n        Pouvez-vous identifier les valeurs cl\u00e9s sur ce parafoudre DC Type 2 KUANGYA 1000V authentique ?\n      <\/p>\n    <\/div>\n\n\n    <!-- Quiz Questions -->\n    <div class=\"kuangya-spd-quiz-content\">\n\n      <!-- Question 1 -->\n      <div class=\"quiz-card\">\n        <h3>\n          1. Quelle valeur indique la tension maximale de r\u00e9gime permanent de ce parafoudre DC ?\n        <\/h3>\n\n        <div class=\"quiz-options\">\n          <button type=\"button\" data-correct=\"false\">Up : 3,5 kV<\/button>\n          <button type=\"button\" data-correct=\"true\">Uc : 1000 Vdc<\/button>\n          <button type=\"button\" data-correct=\"false\">Imax : 40kA<\/button>\n          <button type=\"button\" data-correct=\"false\">In : 20kA<\/button>\n        <\/div>\n\n        <div class=\"quiz-feedback\" aria-live=\"polite\">\n          <strong>R\u00e9ponse correcte : Uc : 1000 Vdc<\/strong>\n          <p>\n            Uc indique la tension maximale de r\u00e9gime permanent que ce parafoudre est con\u00e7u pour supporter.\n          <\/p>\n        <\/div>\n      <\/div>\n\n\n      <!-- Question 2 -->\n      <div class=\"quiz-card\">\n        <h3>\n          2. Quelle valeur indique le courant de d\u00e9charge maximal de ce parafoudre de Type 2 ?\n        <\/h3>\n\n        <div class=\"quiz-options\">\n          <button type=\"button\" data-correct=\"false\">Uc : 1000 Vdc<\/button>\n          <button type=\"button\" data-correct=\"false\">Up : 3,5 kV<\/button>\n          <button type=\"button\" data-correct=\"true\">Imax : 40kA<\/button>\n          <button type=\"button\" data-correct=\"false\">EN\/IEC 61643-11<\/button>\n        <\/div>\n\n        <div class=\"quiz-feedback\" aria-live=\"polite\">\n          <strong>R\u00e9ponse correcte : Imax : 40kA<\/strong>\n          <p>\n            Imax est le courant de d\u00e9charge maximal que le parafoudre de type 2 peut supporter dans ses conditions d'essai sp\u00e9cifi\u00e9es.\n          <\/p>\n        <\/div>\n      <\/div>\n\n\n      <!-- Question 3 -->\n      <div class=\"quiz-card\">\n        <h3>\n          Quelle valeur indique le niveau de protection en tension ?\n        <\/h3>\n\n        <div class=\"quiz-options\">\n          <button type=\"button\" data-correct=\"false\">In : 20kA<\/button>\n          <button type=\"button\" data-correct=\"true\">Up : 3,5 kV<\/button>\n          <button type=\"button\" data-correct=\"false\">Uc : 1000 Vdc<\/button>\n          <button type=\"button\" data-correct=\"false\">KYPV\/1000<\/button>\n        <\/div>\n\n        <div class=\"quiz-feedback\" aria-live=\"polite\">\n          <strong>R\u00e9ponse correcte : Up : 3,5kV<\/strong>\n          <p>\n            Up est le niveau de protection en tension. Il indique le niveau de tension qui peut subsister aux bornes du parafoudre pendant qu'il limite une surtension.\n          <\/p>\n        <\/div>\n      <\/div>\n\n\n      <!-- Internal Link to Previous Article -->\n      <div class=\"quiz-footer-box\">\n        <p>\n          <strong>Vous avez un doute sur ces marquages ?<\/strong>\n        <\/p>\n\n        <p>\n          Notre guide pr\u00e9c\u00e9dent explique plus en d\u00e9tail les valeurs Uc, In, Imax, Up et les autres valeurs indiqu\u00e9es sur les \u00e9tiquettes des parafoudres CC.\n        <\/p>\n\n        <a\n          class=\"quiz-readmore\"\n          href=\"https:\/\/cnkuangya.com\/fr\/blog\/dc-spd-specifications\/\"\n        >\n          Comment lire l'\u00e9tiquette d'un parafoudre CC : explications sur la Classe II, Ucpv, In, Imax, Up et Iscpv \u2192\n        <\/a>\n      <\/div>\n\n\n      <!-- Reset -->\n      <div class=\"quiz-reset-wrap\">\n        <button type=\"button\" class=\"quiz-reset-btn\">\n          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     if (button.dataset.correct !== 'true') {\n          button.classList.add('wrong');\n        }\n\n\n        feedback.style.display = 'block';\n\n      });\n\n    });\n\n  });\n\n\n  const resetButton = quiz.querySelector('.quiz-reset-btn');\n\n  if (resetButton) {\n\n    resetButton.addEventListener('click', function () {\n\n      cards.forEach(function (card) {\n\n        card.classList.remove('answered');\n\n        const buttons = card.querySelectorAll('.quiz-options button');\n        const feedback = card.querySelector('.quiz-feedback');\n\n        buttons.forEach(function (button) {\n          button.classList.remove('correct', 'wrong', 'disabled');\n        });\n\n        feedback.style.display = 'none';\n\n      });\n\n    });\n\n  }\n\n})();\n<\/script>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Que prot\u00e8ge r\u00e9ellement un parafoudre int\u00e9gr\u00e9 \u00e0 un onduleur solaire ?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Un parafoudre CC int\u00e9gr\u00e9 signifie normalement que la protection contre les surtensions a \u00e9t\u00e9 int\u00e9gr\u00e9e du c\u00f4t\u00e9 entr\u00e9e CC de l'onduleur.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Mais les conceptions des onduleurs ne sont pas toutes identiques.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Certains fabricants installent une protection de Type 2 en standard.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Certains produits disposent d'une protection \u00e0 la fois c\u00f4t\u00e9 CC et c\u00f4t\u00e9 CA.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Certains mod\u00e8les commerciaux utilisent une protection de Type 1+2 c\u00f4t\u00e9 CC.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Certaines plateformes d'onduleurs permettent de commander le parafoudre (SPD) pr\u00e9install\u00e9 ou de l'ajouter ult\u00e9rieurement.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cela signifie que vous devez toujours v\u00e9rifier le <strong>mod\u00e8le exact de l'onduleur<\/strong>, plut\u00f4t que de supposer que chaque onduleur d'un m\u00eame fabricant utilise le m\u00eame dispositif de protection.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Un manuel ou une fiche technique d'onduleur utile devrait vous aider \u00e0 identifier plusieurs \u00e9l\u00e9ments :<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Le parafoudre est-il situ\u00e9 c\u00f4t\u00e9 courant continu (DC) ou c\u00f4t\u00e9 courant alternatif (AC) ?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">C'est fondamental.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Le champ photovolta\u00efque alimente l'onduleur par le c\u00f4t\u00e9 courant continu (DC).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">L'onduleur se connecte au syst\u00e8me de distribution par le c\u00f4t\u00e9 CA.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Un parafoudre CA ne devient pas simplement une protection c\u00f4t\u00e9 CC parce qu'il est install\u00e9 \u00e0 l'int\u00e9rieur du m\u00eame bo\u00eetier d'onduleur.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Quel type de parafoudre est install\u00e9 ?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Cherchez :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Type 1<\/li>\n\n\n\n<li>Type 2<\/li>\n\n\n\n<li>Type 1+2<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Vous n'\u00eates pas s\u00fbr de la diff\u00e9rence entre ces types ? Consultez notre<a href=\"https:\/\/cnkuangya.com\/fr\/blog\/type-1-vs-type-2-spd-for-solar\/\"> Comparaison des parafoudres CC de type 1, type 2 et type 1+2<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ne remplacez pas cette question par :<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u201c Lequel a la valeur kA la plus \u00e9lev\u00e9e ? \u201d<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Le type de parafoudre indique quelque chose de diff\u00e9rent de la valeur du courant de d\u00e9charge.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Le parafoudre est-il rempla\u00e7able ?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Ceci est particuli\u00e8rement important pour la maintenance.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Certains parafoudres int\u00e9gr\u00e9s utilisent des modules ou des cartouches rempla\u00e7ables. D'autres n\u00e9cessitent des proc\u00e9dures de maintenance sp\u00e9cifiques.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Fronius, par exemple, indique dans sa documentation Verto que lorsque le parafoudre a fonctionn\u00e9, son indicateur m\u00e9canique passe du vert au rouge et le parafoudre d\u00e9clench\u00e9 doit \u00eatre remplac\u00e9 pour maintenir une fonction de protection compl\u00e8te.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Donc <strong>\u201c Int\u00e9gr\u00e9 \u201d ne signifie pas \u201c sans entretien pour toujours \u201d.\u201d<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/built-in-spd-inside-solar-inverter-1024x576.jpg\" alt=\"Built-in DC and AC SPD locations inside a solar inverter\" class=\"wp-image-4400\" srcset=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/built-in-spd-inside-solar-inverter-1024x576.jpg 1024w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/built-in-spd-inside-solar-inverter-300x169.jpg 300w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/built-in-spd-inside-solar-inverter-768x432.jpg 768w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/built-in-spd-inside-solar-inverter-1536x864.jpg 1536w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/built-in-spd-inside-solar-inverter-18x10.jpg 18w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/built-in-spd-inside-solar-inverter-600x338.jpg 600w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/built-in-spd-inside-solar-inverter.jpg 1672w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Les parafoudres int\u00e9gr\u00e9s prot\u00e8gent des chemins \u00e9lectriques sp\u00e9cifiques \u00e0 l'int\u00e9rieur ou \u00e0 proximit\u00e9 de l'onduleur.<\/figcaption><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Les onduleurs r\u00e9els montrent pourquoi le \u201c parafoudre int\u00e9gr\u00e9 \u201d n'est pas une configuration standard unique.<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Plut\u00f4t que d'inventer des sp\u00e9cifications d'onduleurs hypoth\u00e9tiques, examinons plusieurs produits r\u00e9els et leur documentation officielle publi\u00e9e.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Exemples d'onduleurs en conditions r\u00e9elles<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Real inverter<\/th><th>Published surge-protection configuration<\/th><th>What it teaches us<\/th><\/tr><\/thead><tbody><tr><td>Sungrow SG3.0RS-L<\/td><td>Parafoudre CC et CA de type II int\u00e9gr\u00e9<\/td><td>A residential inverter may integrate Type 2 protection on both sides<\/td><\/tr><tr><td>Sungrow SG30CX-P2 \/ SG50CX-P2<\/td><td>DC Type I+II \/ AC Type II<\/td><td>A larger inverter may use different SPD types on the DC and AC sides<\/td><\/tr><tr><td>Huawei SUN2000-150K-MG0<\/td><td>DC Type II \/ AC Type II surge arresters<\/td><td>Even high-power string inverters can include Type 2 protection internally<\/td><\/tr><tr><td><a href=\"https:\/\/manuals.fronius.com\/html\/4204260175\/en.html\" rel=\"noopener\">Fronius Symo<\/a><\/td><td>DC SPD options can be pre-installed or retrofitted; Type 1+2 and Type 2 versions are available depending on device and operating mode<\/td><td>\u201cBuilt-in SPD\u201d may be configurable rather than identical across all units<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">These examples are useful because they show something that a generic statement like <strong>\u201cmodern inverters have SPD\u201d<\/strong> cannot explain.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Different real inverters use different protection concepts.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For example, Sungrow&#8217;s current SG3.0RS-L product information specifies <strong>built-in Type II DC &amp; AC SPD<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But Sungrow&#8217;s SG30CX-P2 and SG50CX-P2 datasheet lists <strong>DC Type I+II \/ AC Type II<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The conclusion is simple:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>\u201cMy inverter has an SPD\u201d is only the beginning of the conversation.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Check three things next:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>What type is it?<\/strong><br><strong>DC side or AC side?<\/strong><br><strong>Where is it installed?<\/strong><\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Why SPD Location Can Matter More Than SPD Quantity<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">A common way to think about surge protection is:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">One SPD = protected<br>Two SPDs = more protected<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">That is not a good design principle.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Two SPDs installed at the wrong places do not automatically create better protection than one correctly positioned and coordinated system.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The better question is:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Where is the surge protective device in relation to the equipment and cable route that need protection?<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Consider these two simplified systems.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">System A<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>PV array \u2192 4 m DC cable \u2192 inverter with built-in Type 2 SPD<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">System B<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>PV array \u2192 35 m DC cable \u2192 building entry \u2192 inverter with built-in Type 2 SPD<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The inverter may be exactly the same.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The built-in SPD may also be exactly the same.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But the installation is not the same.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In System B, a much longer outdoor DC cable exists between the PV array and the inverter.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That changes the surge-protection problem.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/solar-pv-spd-4m-vs-35m-cable-distance-1024x576.jpg\" alt=\"Comparison of 4 m and 35 m PV cable distances for SPD placement\" class=\"wp-image-4401\" srcset=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/solar-pv-spd-4m-vs-35m-cable-distance-1024x576.jpg 1024w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/solar-pv-spd-4m-vs-35m-cable-distance-300x169.jpg 300w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/solar-pv-spd-4m-vs-35m-cable-distance-768x432.jpg 768w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/solar-pv-spd-4m-vs-35m-cable-distance-1536x864.jpg 1536w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/solar-pv-spd-4m-vs-35m-cable-distance-18x10.jpg 18w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/solar-pv-spd-4m-vs-35m-cable-distance-600x338.jpg 600w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/solar-pv-spd-4m-vs-35m-cable-distance.jpg 1672w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">The same inverter SPD can lead to different protection considerations when the PV cable route becomes much longer.<\/figcaption><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Why Does Cable Distance Matter?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">PV systems often contain long conductors exposed across rooftops, facades, open ground or industrial buildings.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">During nearby lightning activity, electromagnetic effects can induce transient overvoltages into those conductors.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A surge does not have to arrive only from the utility grid.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This means that long PV cable routes must be considered as part of the protection concept.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If the only SPD is located inside the inverter, that protective point is located at one end of the cable.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It does not physically move closer to the PV modules because the inverter manufacturer integrated it into the enclosure.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is why published PV surge-protection guidance considers not only <strong>what SPD is used<\/strong>, but also <strong>where it is installed<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.phoenixcontact.com\/en-pc\/products\/surge-protection\/surge-protection-for-photovoltaic-systems?\" rel=\"noopener\">Phoenix Contact&#8217;s current PV guidance<\/a> identifies the DC side of the inverter as an additional protection location when the cable length to the PV panels is <strong>10 m or more<\/strong>, and also identifies another protection position near the PV panels or building entrance.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Its technical guidance also states that if the cable length between PV panels and inverter exceeds 10 m, an additional protection device should be installed at the other end of the cable near the PV panels.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.dehn-international.com\/en\/master-lightning-and-surge-protection-rooftop-pv-systems\" rel=\"noopener\">DEHN publishes similar rooftop PV guidance<\/a>, stating that if more than 10 m of cable exists between the PV system and inverter, a further arrester is required in the roof area for the arrangement it describes.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/long-pv-dc-cable-induced-surge-1024x576.jpg\" alt=\"Nearby lightning inducing transient overvoltage in a long PV DC cable\" class=\"wp-image-4402\" srcset=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/long-pv-dc-cable-induced-surge-1024x576.jpg 1024w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/long-pv-dc-cable-induced-surge-300x169.jpg 300w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/long-pv-dc-cable-induced-surge-768x432.jpg 768w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/long-pv-dc-cable-induced-surge-1536x864.jpg 1536w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/long-pv-dc-cable-induced-surge-18x10.jpg 18w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/long-pv-dc-cable-induced-surge-600x338.jpg 600w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/long-pv-dc-cable-induced-surge.jpg 1672w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Long outdoor PV conductors can be exposed to transient overvoltages induced by nearby lightning activity.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Does That Mean 10.1 m Always Requires Two SPDs Everywhere?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Non.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is where technical articles often become misleading.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Vous devez <strong>pas<\/strong> take \u201c10 m\u201d and turn it into a universal sentence such as:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u201cEvery PV system longer than 10 meters must always have exactly two Type 2 SPDs.\u201d<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">The actual design still depends on:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>applicable standards;<\/li>\n\n\n\n<li>local electrical requirements;<\/li>\n\n\n\n<li>external lightning protection;<\/li>\n\n\n\n<li>separation distance;<\/li>\n\n\n\n<li>system architecture;<\/li>\n\n\n\n<li>manufacturer instructions;<\/li>\n\n\n\n<li>and project specifications.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The useful lesson is simpler:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Around this distance, cable length stops being something you should ignore and becomes an important design consideration.<\/strong><\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">A Practical Distance Table<\/h1>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Installation situation<\/th><th>What you should check<\/th><\/tr><\/thead><tbody><tr><td>PV array is close to the inverter<\/td><td>Check the built-in SPD, inverter instructions and applicable project requirements<\/td><\/tr><tr><td>Long c\u00e2ble CC entre le champ photovolta\u00efque et l'onduleur<\/td><td>Evaluate protection locations at both ends of the cable route<\/td><\/tr><tr><td>Remote PV combiner box<\/td><td>Check whether it already contains a DC SPD<\/td><\/tr><tr><td>Cable enters a building far from inverter<\/td><td>Evaluate the building-entry protection point<\/td><\/tr><tr><td>External lightning protection is present<\/td><td>Check separation distance and whether Type 1 protection is required<\/td><\/tr><tr><td>Separation distance cannot be maintained<\/td><td>Do not assume another Type 2 SPD is automatically the correct answer<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The important point is that <strong>distance affects location decisions<\/strong>, not merely product quantity.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">What About a PV Combiner Box?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">A <a href=\"https:\/\/cnkuangya.com\/fr\/blog\/solar-pv-electrical-protection\/\">bo\u00eete de raccordement<\/a> is another reason why you should inspect the whole PV system before ordering another SPD.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Imagine a project where the inverter datasheet says:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Built-in DC Type 2 SPD<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A buyer may then request another external Type 2 SPD because they assume the array side has no protection.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But the project&#8217;s combiner box may already include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>string fuses;<\/li>\n\n\n\n<li>DC isolator;<\/li>\n\n\n\n<li>DC SPD;<\/li>\n\n\n\n<li>monitoring;<\/li>\n\n\n\n<li>and other protective components.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">In that situation, surge protection may already exist at more than one point.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">So before buying another SPD, ask:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>\u201cIs there already an SPD inside the combiner box?\u201d<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">This sounds obvious, but in real purchasing work, different components are often quoted by different suppliers.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The inverter may come from one manufacturer.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The combiner box comes from another.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The electrical protection devices come from a third.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A buyer looking only at individual product datasheets can easily lose sight of the complete single-line diagram.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/pv-combiner-box-external-dc-spd-1024x683.jpg\" alt=\"PV combiner box with DC SPD fuse holders and isolator\" class=\"wp-image-4403\" srcset=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/pv-combiner-box-external-dc-spd-1024x683.jpg 1024w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/pv-combiner-box-external-dc-spd-300x200.jpg 300w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/pv-combiner-box-external-dc-spd-768x512.jpg 768w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/pv-combiner-box-external-dc-spd-18x12.jpg 18w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/pv-combiner-box-external-dc-spd-600x400.jpg 600w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/pv-combiner-box-external-dc-spd.jpg 1536w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Before adding another SPD, check whether the PV combiner box already contains surge protection.<\/figcaption><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">External Lightning Protection Changes the Answer<\/h1>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/pv-external-lightning-protection-separation-distance-1024x683.jpg\" alt=\"Solar PV system with external lightning protection and separation distance\" class=\"wp-image-4404\" srcset=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/pv-external-lightning-protection-separation-distance-1024x683.jpg 1024w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/pv-external-lightning-protection-separation-distance-300x200.jpg 300w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/pv-external-lightning-protection-separation-distance-768x512.jpg 768w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/pv-external-lightning-protection-separation-distance-18x12.jpg 18w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/pv-external-lightning-protection-separation-distance-600x400.jpg 600w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/pv-external-lightning-protection-separation-distance.jpg 1536w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">External lightning protection and separation distance can change the required SPD type and placement.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Now consider a building with an external lightning protection system.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This can include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>air terminals;<\/li>\n\n\n\n<li>lightning conductors;<\/li>\n\n\n\n<li>down conductors;<\/li>\n\n\n\n<li>bonding;<\/li>\n\n\n\n<li>and an earthing system designed as part of a lightning protection concept.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">At this point, the question:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u201cDo I need one more Type 2 SPD?\u201d<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">may be too simple.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">One critical factor is whether the required <strong>separation distance<\/strong> between the PV installation and the external lightning protection system can be maintained.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Phoenix Contact&#8217;s current PV guidance distinguishes between systems:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>without external lightning protection;<\/li>\n\n\n\n<li>with external lightning protection where separation distance is maintained;<\/li>\n\n\n\n<li>and with external lightning protection where separation distance is not maintained.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">For the DC side, its published selection table shows Type 2 protection where separation distance is maintained, while Type 1 protection is specified for the relevant protection positions when separation distance is not maintained.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">So if your building has external lightning protection, do not simply ask:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u201cShould I add another SPD?\u201d<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Demandez :<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>\u201cWhat lightning protection concept applies to this building, and can the required separation distance be maintained?\u201d<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">That question is much more useful.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Built-In SPD vs External SPD<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">It is easy to assume that one must be better than the other.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That is not really the point.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Built-In SPD<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Advantages can include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>protection very close to inverter electronics;<\/li>\n\n\n\n<li>compact integration;<\/li>\n\n\n\n<li>shorter internal connections;<\/li>\n\n\n\n<li>easier equipment packaging;<\/li>\n\n\n\n<li>and, depending on the inverter design, monitoring or replaceable modules.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Its main limitation is obvious:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>its location is fixed inside or directly at the inverter.<\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">External SPD<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">An external SPD can be installed where the system design requires another protection point.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Typical locations include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>PV combiner box;<\/li>\n\n\n\n<li>near the PV array;<\/li>\n\n\n\n<li>building entrance;<\/li>\n\n\n\n<li>external DC protection box;<\/li>\n\n\n\n<li>near the inverter;<\/li>\n\n\n\n<li>AC distribution board.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">So instead of asking:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>\u201cIs an external SPD better than the inverter&#8217;s built-in SPD?\u201d<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">ask:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>\u201cWhich protection locations does this installation require, and which of those locations are already covered?\u201d<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">That is the more professional question.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/built-in-spd-vs-external-spd-solar-pv-1024x683.png\" alt=\"Built-in inverter SPD compared with external DC SPD in a PV system\" class=\"wp-image-4405\" srcset=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/built-in-spd-vs-external-spd-solar-pv-1024x683.png 1024w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/built-in-spd-vs-external-spd-solar-pv-300x200.png 300w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/built-in-spd-vs-external-spd-solar-pv-768x512.png 768w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/built-in-spd-vs-external-spd-solar-pv-18x12.png 18w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/built-in-spd-vs-external-spd-solar-pv-600x400.png 600w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/built-in-spd-vs-external-spd-solar-pv.png 1536w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Built-in and external SPDs can protect different locations within the same PV system.<\/figcaption><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">A Real Manufacturer Example: Why the SPD Is Part of a Larger Protection Concept<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Fronius describes the SPD in its Verto documentation as contributing to the protection of PV system components <strong>as part of an overall lightning protection concept<\/strong>. It also specifies maintenance behavior: when the SPD has operated, the mechanical status indication changes from green to red and the device should be replaced to maintain protection.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is an important practical idea.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The inverter&#8217;s SPD is not a magical shield around the entire PV installation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It is <strong>one protective component inside a larger electrical protection concept<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That concept includes:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>surge protection;<\/li>\n\n\n\n<li>earthing;<\/li>\n\n\n\n<li>equipotential bonding;<\/li>\n\n\n\n<li>conductor routing;<\/li>\n\n\n\n<li>lightning protection where applicable;<\/li>\n\n\n\n<li>overcurrent protection;<\/li>\n\n\n\n<li>correct installation;<\/li>\n\n\n\n<li>and maintenance.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This is why the answer cannot come from one specification line alone.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Three Installation Scenarios<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">The following are <strong>illustrative installation scenarios<\/strong>, not claimed customer projects. They are designed to show how the same inverter specification can lead to different questions.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Scenario A: Small Residential Rooftop<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Le syst\u00e8me :<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>residential rooftop PV;<\/li>\n\n\n\n<li>string inverter;<\/li>\n\n\n\n<li>built-in DC Type 2 SPD;<\/li>\n\n\n\n<li>PV array approximately 5 m from inverter;<\/li>\n\n\n\n<li>no external lightning protection system;<\/li>\n\n\n\n<li>no remote combiner box.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">In this situation, it would be wrong to automatically say:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u201cYou definitely need another external Type 2 SPD.\u201d<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Instead, check:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>the inverter manual;<\/li>\n\n\n\n<li>the built-in SPD specification;<\/li>\n\n\n\n<li>local requirements;<\/li>\n\n\n\n<li>earthing;<\/li>\n\n\n\n<li>actual cable routing;<\/li>\n\n\n\n<li>and whether another SPD is already present elsewhere.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A short and simple installation is very different from a large commercial rooftop.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Scenario B: Commercial Rooftop with a 35 m DC Cable Route<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Le syst\u00e8me :<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>large PV array;<\/li>\n\n\n\n<li>remote combiner box;<\/li>\n\n\n\n<li>inverter room inside the building;<\/li>\n\n\n\n<li>approximately 35 m DC cable route;<\/li>\n\n\n\n<li>inverter includes DC Type 2 protection.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Now the situation is different.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The built-in SPD provides protection at the inverter end.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But there is a long DC route between the array and inverter.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is precisely the type of installation where published manufacturer guidance about <strong>additional protection locations on long cable runs<\/strong> becomes relevant.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The correct question becomes:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u201cIs coordinated surge protection also required near the array or combiner box?\u201d<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Not:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u201cDoes the inverter have an SPD?\u201d<\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Scenario C: Rooftop PV with External Lightning Protection<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Le syst\u00e8me :<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>commercial building;<\/li>\n\n\n\n<li>external lightning protection system;<\/li>\n\n\n\n<li>rooftop PV;<\/li>\n\n\n\n<li>inverter includes DC Type 2 protection.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Before deciding whether to add another Type 2 SPD, you need another piece of information:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Can the required separation distance be maintained?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If it cannot, the required protection concept may involve Type 1 protection at relevant locations rather than simply duplicating Type 2 devices. Phoenix Contact&#8217;s published PV guidance explicitly distinguishes these conditions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The presence of a built-in Type 2 SPD therefore does not answer the whole lightning-protection question.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Does AC Type 2 SPD Protect the PV DC Side?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Non.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is one of the easiest misunderstandings to avoid.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A modern inverter may have:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>DC SPD: Type II<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">et<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>AC SPD: Type II<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">because the DC and AC sides are separate electrical paths.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The PV array reaches the inverter through DC conductors.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The grid or AC distribution system connects through the inverter AC side.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Surges can reach equipment through different paths.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Real inverter datasheets demonstrate this separation clearly.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For example, Sungrow&#8217;s SG30CX-P2 \/ SG50CX-P2 specification lists the DC and AC surge protection separately: <strong>DC Type I+II \/ AC Type II<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That would make little sense if one SPD automatically protected both sides.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">There Is Another Path People Forget: Communication Lines<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Power cables are not the only conductors connected to modern PV systems.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">An inverter may also use:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>RS-485;<\/li>\n\n\n\n<li>Ethernet;<\/li>\n\n\n\n<li>weather station connections;<\/li>\n\n\n\n<li>digital inputs;<\/li>\n\n\n\n<li>monitoring cables;<\/li>\n\n\n\n<li>control signals;<\/li>\n\n\n\n<li>power-management communication.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/solar-inverter-dc-ac-communication-surge-paths-1024x576.jpg\" alt=\"DC AC and communication surge paths connected to a solar inverter\" class=\"wp-image-4406\" srcset=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/solar-inverter-dc-ac-communication-surge-paths-1024x576.jpg 1024w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/solar-inverter-dc-ac-communication-surge-paths-300x169.jpg 300w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/solar-inverter-dc-ac-communication-surge-paths-768x432.jpg 768w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/solar-inverter-dc-ac-communication-surge-paths-1536x864.jpg 1536w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/solar-inverter-dc-ac-communication-surge-paths-18x10.jpg 18w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/solar-inverter-dc-ac-communication-surge-paths-600x338.jpg 600w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/solar-inverter-dc-ac-communication-surge-paths.jpg 1672w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Surges can reach inverter electronics through DC, AC and communication circuits.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Phoenix Contact specifically points out that overvoltages can also enter inverter electronics through network or control interfaces and recommends considering surge protection for communication interfaces such as Ethernet, RS-485 and weather-station connections.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is a useful reminder:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>\u201cMy DC and AC sides both have SPDs\u201d still does not necessarily mean every electrical path entering sensitive equipment has been considered.<\/strong><\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Common Misunderstandings<\/h1>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Common assumption<\/th><th>Better way to think about it<\/th><\/tr><\/thead><tbody><tr><td>My inverter has a built-in SPD, so the whole PV system is protected<\/td><td>Check the entire cable route and all relevant protection locations<\/td><\/tr><tr><td>My inverter has an AC SPD, so the PV side is protected<\/td><td>DC and AC sides must be evaluated separately<\/td><\/tr><tr><td>Two SPDs are always better than one<\/td><td>Position and coordination matter more than simply increasing quantity<\/td><\/tr><tr><td>A higher kA rating always means a better SPD<\/td><td>Type, voltage rating, protection level and application also matter<\/td><\/tr><tr><td>Type 1+2 is automatically better for every system<\/td><td>The correct SPD type depends on the installation and lightning exposure<\/td><\/tr><tr><td>Built-in SPD means I never need to inspect it<\/td><td>Integrated SPDs can still reach end of life and require replacement<\/td><\/tr><tr><td>Cable distance does not matter because the inverter has an SPD<\/td><td>Long cable routes can create a need to evaluate an additional protection point<\/td><\/tr><tr><td>\u201cSurge protection\u201d in a datasheet tells me everything<\/td><td>Always verify side, SPD type and actual technical specification<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Can I Simply Add More SPDs to Be Safe?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Pas n\u00e9cessairement.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Surge protection should be <strong>coordinated<\/strong>, not accumulated randomly.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Installing another SPD without considering:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>SPD type;<\/li>\n\n\n\n<li>voltage;<\/li>\n\n\n\n<li>installation point;<\/li>\n\n\n\n<li>conductor routing;<\/li>\n\n\n\n<li>earthing;<\/li>\n\n\n\n<li>protection level;<\/li>\n\n\n\n<li>distance;<\/li>\n\n\n\n<li>upstream and downstream devices;<\/li>\n\n\n\n<li>and manufacturer instructions<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">does not automatically improve the installation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Imagine putting two Type 2 SPDs next to each other inside the same cabinet when the actual problem is a 40 m cable route from a remote PV array.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">You have increased the number of SPDs.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But you may not have solved the real problem.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is why good design starts with the system layout.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Do Not Forget SPD Wiring<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Even a correctly selected SPD can lose effectiveness if its installation is poor.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">During a surge event, connection conductors are not electrically \u201cinvisible.\u201d<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Long or unnecessarily looped conductors add inductive voltage.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This means two systems can use exactly the same SPD but achieve different real protection performance.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Installation A<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">SPD located close to the protected equipment with short, direct conductors.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Installation B<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Same SPD, but connected through long looping conductors inside the cabinet.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The product label is identical.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The installation is not.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is why selecting a device only by looking at:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>1000 V<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>20 kA<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>40 kA<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">is incomplete.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The SPD and its installation must work together.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Before Buying Another SPD: Check These 7 Things<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">This is the checklist worth saving.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>V\u00e9rifier<\/th><th>Information you need<\/th><th>Pourquoi c'est important<\/th><\/tr><\/thead><tbody><tr><td><strong>1. Exact inverter model<\/strong><\/td><td>Brand + complete model number<\/td><td>Different models from the same manufacturer may use different SPD arrangements<\/td><\/tr><tr><td><strong>2. Built-in SPD location<\/strong><\/td><td>DC, AC or both<\/td><td>Tells you which electrical path already has protection<\/td><\/tr><tr><td><strong>3. SPD type<\/strong><\/td><td>Type 1, Type 2 or Type 1+2<\/td><td>Helps determine its intended role in the protection concept<\/td><\/tr><tr><td><strong>4. PV-to-inverter cable distance<\/strong><\/td><td>Actual cable route in meters<\/td><td>Long cable runs may require another protection location to be evaluated<\/td><\/tr><tr><td><strong>5. Combiner box configuration<\/strong><\/td><td>Is an SPD already inside?<\/td><td>Prevents unnecessary duplication<\/td><\/tr><tr><td><strong>6. External lightning protection<\/strong><\/td><td>Yes \/ No + separation condition<\/td><td>Can significantly change the required SPD type and location<\/td><\/tr><tr><td><strong>7. Manufacturer\/project requirements<\/strong><\/td><td>Inverter manual, single-line diagram and project specification<\/td><td>Final selection must match the actual installation<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/solar-inverter-spd-7-point-checklist-1024x683.jpg\" alt=\"Seven-point checklist before adding an external SPD to a solar inverter\" class=\"wp-image-4407\" srcset=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/solar-inverter-spd-7-point-checklist-1024x683.jpg 1024w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/solar-inverter-spd-7-point-checklist-300x200.jpg 300w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/solar-inverter-spd-7-point-checklist-768x512.jpg 768w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/solar-inverter-spd-7-point-checklist-18x12.jpg 18w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/solar-inverter-spd-7-point-checklist-600x400.jpg 600w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/09\/solar-inverter-spd-7-point-checklist.jpg 1536w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Check the inverter, SPD type, cable distance, combiner box and lightning protection before adding another SPD.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">If you can provide these seven pieces of information, an installer or SPD supplier can give you a much more useful answer.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">A Simple Decision Flow<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Step 1 \u2014 Does the inverter have a clearly specified DC SPD?<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Non<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Evaluate DC-side surge protection for the PV installation.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Oui<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Continue to Step 2.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Step 2 \u2014 What type is it?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Check:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Type 1<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Type 2<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">ou<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Type 1+2<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Do not guess from the size of the inverter.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Use the actual datasheet.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Step 3 \u2014 Where is it installed?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">If it is built into the inverter, you have a protection point at the inverter.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Now look at the rest of the DC cable route.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Step 4 \u2014 How far is the PV array from the inverter?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">If the cable route is short, check the inverter instructions and applicable installation requirements before adding another device.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If the cable route is long, evaluate whether another coordinated protection point is required closer to the PV array or combiner box.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Published PV guidance from Phoenix Contact and DEHN specifically treats longer cable distances as a reason to consider protection at additional locations.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Step 5 \u2014 Is external lightning protection installed?<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Non<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Continue with the applicable surge-protection design for the PV installation.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Oui<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Check whether the required separation distance can be maintained.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If it cannot, Type 1 protection may become relevant at the applicable installation points.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Step 6 \u2014 Is another SPD already installed?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Check:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>PV combiner box;<\/li>\n\n\n\n<li>array-side protection enclosure;<\/li>\n\n\n\n<li>inverter DC protection box;<\/li>\n\n\n\n<li>main distribution;<\/li>\n\n\n\n<li>AC distribution;<\/li>\n\n\n\n<li>building entry point.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Do not add products based on assumptions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Check the actual system.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Real Example: Same Manufacturer, Different Answer<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">This is perhaps the easiest way to understand why checking the exact model matters.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Consider two real Sungrow inverter families.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><a href=\"https:\/\/en.sungrowpower.com\/productDetail\/4064\/string-inverter-sg3-0rs-l?\" rel=\"noopener\">Sungrow SG3.0RS-L<\/a><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The current official product page states:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Built-in Type II DC &amp; AC SPD.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Now consider:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Sungrow SG30CX-P2 \/ SG50CX-P2<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The official datasheet specifies:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>DC Type I+II \/ AC Type II.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Both products are Sungrow inverters.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Both include surge protection.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But the published DC SPD configuration is not the same.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That alone shows why questions such as:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u201cDoes a Sungrow inverter already have an SPD?\u201d<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">are too broad.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The correct question is:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>\u201cWhich Sungrow model, and what does its datasheet specify?\u201d<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">The same principle applies to other manufacturers.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">What Information Should You Send an SPD Supplier?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">If you are a purchaser, distributor or project buyer, you do not need to design the complete lightning protection system yourself.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But sending the correct information can dramatically improve the quality of the recommendation you receive.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Instead of sending:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u201cNeed 1000V 40kA SPD. Please quote.\u201d<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">send:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">PV system information<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/cnkuangya.com\/fr\/blog\/dc-spd-selection-guide\/\">Tension maximale du syst\u00e8me photovolta\u00efque<\/a><\/li>\n\n\n\n<li>Maximum string Voc if available<\/li>\n\n\n\n<li>Inverter brand and model<\/li>\n\n\n\n<li>Built-in SPD specification<\/li>\n\n\n\n<li>Approximate PV-to-inverter cable distance<\/li>\n\n\n\n<li>Combiner box information<\/li>\n\n\n\n<li>External lightning protection: yes\/no<\/li>\n\n\n\n<li>Required SPD installation position<\/li>\n\n\n\n<li>Quantit\u00e9<\/li>\n\n\n\n<li>Applicable standard or project requirement<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Why is this better?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Because:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>1000V + 40kA<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">does not tell the supplier whether the SPD is intended:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>near the inverter;<\/li>\n\n\n\n<li>in a combiner box;<\/li>\n\n\n\n<li>near the array;<\/li>\n\n\n\n<li>in a system with external lightning protection;<\/li>\n\n\n\n<li>or as part of a Type 1+2 protection concept.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A specification is useful only when it is connected to an application.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">FAQ<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">1. My inverter already has a DC Type 2 SPD. Do I always need another external SPD?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Non.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The correct decision depends on the complete installation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cable distance, SPD location, combiner-box configuration, external lightning protection, separation distance and manufacturer requirements should all be considered.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Do not automatically add another SPD, but do not automatically remove external protection simply because the inverter includes one.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">2. If the inverter and PV array are more than 10 m apart, do I always need exactly two SPDs?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Do not treat the number as an isolated universal rule.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">However, 10 m is an important design threshold in published PV surge-protection guidance.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Phoenix Contact identifies additional DC-side protection locations where the distance between the inverter and PV panels is 10 m or more, while DEHN likewise identifies additional protection on longer cable routes in its rooftop PV guidance.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Use the distance as a reason to evaluate the system\u2014not as a substitute for engineering judgment or applicable requirements.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">3. Does an AC Type 2 SPD inside the inverter protect the DC side?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Non.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">AC and PV DC are separate electrical paths.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Check the datasheet specifically for <strong>DC SPD<\/strong>, <strong>PV SPD<\/strong>, or the manufacturer&#8217;s equivalent terminology.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">4. Is Type 1+2 always better than Type 2?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Not simply because it sounds like a higher number.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Type 1+2 and Type 2 are intended for different surge and lightning-protection conditions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For example, Phoenix Contact&#8217;s PV guidance differentiates SPD type according to whether external lightning protection is present and whether separation distance is maintained.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Select the appropriate type for the installation rather than choosing by label alone.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">5. If my combiner box already has an SPD, do I still need the inverter&#8217;s built-in SPD?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Possibly.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The two devices may be protecting different points along a longer cable route.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is exactly why you should evaluate the <strong>distance and location relationship<\/strong> rather than asking which one of the two devices is unnecessary.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">6. Can a built-in inverter SPD fail?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Oui.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">SPDs are protective components and can reach end of life after electrical stress.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Fronius, for example, documents a mechanical status indication that changes from green to red when its SPD is triggered and states that the SPD should then be replaced to maintain protection.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Always follow the inverter manufacturer&#8217;s inspection and replacement instructions.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">7. What if the inverter datasheet only says \u201csurge protection\u201d?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Look deeper into the technical documentation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Try to confirm:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>DC or AC side;<\/li>\n\n\n\n<li>SPD type;<\/li>\n\n\n\n<li>relevant voltage rating;<\/li>\n\n\n\n<li>discharge characteristics;<\/li>\n\n\n\n<li>replaceability;<\/li>\n\n\n\n<li>and whether the function is standard or optional.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Do not assume that every use of the phrase <strong>\u201csurge protection\u201d<\/strong> describes the same device.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">The Most Important Lesson: Stop Looking Only at the Inverter<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">It is natural to focus on the inverter.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It is one of the most valuable and technically complex components in a PV system.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But a solar installation is larger than the inverter.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Think about the complete path:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Modules photovolta\u00efques<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2193<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>DC string cables<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2193<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>combiner or protection equipment<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2193<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>long DC cable route<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2193<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>inverter DC input<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2193<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>inverter<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2193<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>AC output<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2193<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>distribution system<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">and possibly:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Ethernet \/ RS-485 \/ monitoring \/ control lines<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A solar inverter built-in SPD sits at one protection point within this larger system. It should therefore be evaluated together with the PV cables, combiner equipment, AC side and other relevant protection locations.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That is why the best question is not:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>\u201cHow many SPDs do I have?\u201d<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">It is:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>\u201cWhere can transient overvoltage enter this system, and where should it be limited before it reaches sensitive equipment?\u201d<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Once you start thinking this way, the confusing question of <strong>\u201cinternal SPD versus external SPD\u201d<\/strong> becomes much easier.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">They are not necessarily competitors.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">They may be parts of the same coordinated protection concept.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Final Takeaway<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Seeing:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u201cDC SPD Type II Built-In\u201d<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">on an inverter datasheet is useful information.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But it is not the end of your surge-protection assessment.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Before deciding whether an external SPD is necessary, check four things first:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. What SPD is actually built into the inverter?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">DC, AC, Type 1, Type 2 or Type 1+2?<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2. Where is it?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A built-in SPD provides a protection point at the inverter. Consider what exists between that point and the PV array.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3. How long is the cable route?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Cable distance can change whether another protection location needs to be evaluated.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">4. Is external lightning protection involved?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">If yes, the lightning protection concept and separation distance become important.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If you can answer these four questions, you are already making a much better decision than someone who simply reads:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u201cBuilt-in SPD\u201d<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">and stops there.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">And if terms such as <strong>Ucpv, In, Imax, Up and Iscpv<\/strong> still look confusing, learn how to read the SPD label before comparing different devices.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Related Guide: <a href=\"https:\/\/cnkuangya.com\/fr\/blog\/dc-spd-specifications\/\">How to Read a DC SPD Label: Class II, Ucpv, In, Imax, Up &amp; Iscpv Explained<\/a><\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Need Help Checking a PV SPD Application?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">KUANGYA manufactures <a href=\"https:\/\/cnkuangya.com\/fr\/dc-spd\/\">surge protective devices for photovoltaic DC applications<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If you are unsure which SPD configuration fits your project, you can provide:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>PV system voltage;<\/li>\n\n\n\n<li>inverter brand and model;<\/li>\n\n\n\n<li>existing built-in SPD information;<\/li>\n\n\n\n<li>cable distance;<\/li>\n\n\n\n<li>intended installation position;<\/li>\n\n\n\n<li>required SPD type, if specified;<\/li>\n\n\n\n<li>and project quantity.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This allows the application to be checked before selecting a specification based only on voltage and kA values.<\/p>","protected":false},"excerpt":{"rendered":"<p>A solar inverter built-in SPD can provide important surge protection, but seeing \u201cDC Type II SPD\u201d on the datasheet does not automatically mean the entire PV system is protected. Sometimes the specification even says: Built-in Type II DC &amp; AC SPD At first, the conclusion seems obvious: \u201cThe inverter already has surge protection. Why would [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":4399,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[35],"tags":[],"class_list":["post-4397","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"blocksy_meta":[],"_links":{"self":[{"href":"https:\/\/cnkuangya.com\/fr\/wp-json\/wp\/v2\/posts\/4397","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cnkuangya.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cnkuangya.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cnkuangya.com\/fr\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/cnkuangya.com\/fr\/wp-json\/wp\/v2\/comments?post=4397"}],"version-history":[{"count":3,"href":"https:\/\/cnkuangya.com\/fr\/wp-json\/wp\/v2\/posts\/4397\/revisions"}],"predecessor-version":[{"id":4411,"href":"https:\/\/cnkuangya.com\/fr\/wp-json\/wp\/v2\/posts\/4397\/revisions\/4411"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cnkuangya.com\/fr\/wp-json\/wp\/v2\/media\/4399"}],"wp:attachment":[{"href":"https:\/\/cnkuangya.com\/fr\/wp-json\/wp\/v2\/media?parent=4397"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cnkuangya.com\/fr\/wp-json\/wp\/v2\/categories?post=4397"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cnkuangya.com\/fr\/wp-json\/wp\/v2\/tags?post=4397"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}