{"id":4354,"date":"2026-08-24T14:36:47","date_gmt":"2026-08-24T06:36:47","guid":{"rendered":"https:\/\/cnkuangya.com\/?p=4354"},"modified":"2026-08-24T14:36:53","modified_gmt":"2026-08-24T06:36:53","slug":"dc-spd-selection-guide","status":"publish","type":"post","link":"https:\/\/cnkuangya.com\/fr\/blog\/dc-spd-selection-guide\/","title":{"rendered":"Comment choisir la tension nominale correcte d'un parafoudre CC pour les syst\u00e8mes photovolta\u00efques"},"content":{"rendered":"<h2 class=\"wp-block-heading\">Guide pratique pour choisir des parafoudres CC de 600V, 1000V et 1500V<\/h2>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Introduction<\/h2>\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>La s\u00e9lection du parafoudre CC<\/strong> est l'une des \u00e9tapes les plus importantes dans la conception d'un syst\u00e8me de protection solaire photovolta\u00efque (PV) fiable. Choisir la tension nominale correcte d'un parafoudre CC (SPD CC) garantit une performance de protection fiable et une stabilit\u00e9 du syst\u00e8me \u00e0 long terme.<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">De nombreux utilisateurs se concentrent principalement sur le courant de d\u00e9charge nominal (kA) lors du choix d'un parafoudre, mais la tension nominale est tout aussi critique. Le parafoudre CC s\u00e9lectionn\u00e9 doit \u00eatre capable de supporter la tension maximale possible g\u00e9n\u00e9r\u00e9e par le syst\u00e8me photovolta\u00efque dans des conditions de fonctionnement normales.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Un parafoudre avec une tension nominale insuffisante peut subir une d\u00e9gradation pr\u00e9matur\u00e9e ou une d\u00e9faillance, tandis qu'un parafoudre avec une tension nominale inutilement \u00e9lev\u00e9e pourrait ne pas offrir le niveau de protection le plus optimis\u00e9 pour l'application.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pour les syst\u00e8mes photovolta\u00efques, le param\u00e8tre de tension cl\u00e9 est <strong>Ucpv (Tension maximale de fonctionnement continu pour les syst\u00e8mes photovolta\u00efques)<\/strong>. Une s\u00e9lection correcte n\u00e9cessite de comprendre la tension maximale du syst\u00e8me photovolta\u00efque, la tension en circuit ouvert (Voc) des modules et les effets de la temp\u00e9rature.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ce guide explique comment s\u00e9lectionner la tension nominale correcte du parafoudre CC pour les syst\u00e8mes solaires photovolta\u00efques, y compris pour les applications courantes de 600V CC, 1000V CC et 1500V CC.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Principaux enseignements<\/h1>\n\n\n\n<ul class=\"wp-block-list\">\n<li>La s\u00e9lection de la tension du parafoudre CC doit \u00eatre bas\u00e9e sur la tension maximale du syst\u00e8me photovolta\u00efque, et non uniquement sur la tension de l'onduleur.<\/li>\n\n\n\n<li>Ucpv est le param\u00e8tre cl\u00e9 pour la s\u00e9lection des tensions nominales des parafoudres CC photovolta\u00efques.<\/li>\n\n\n\n<li>Le calcul de la tension du syst\u00e8me photovolta\u00efque doit prendre en compte la Voc des modules et les facteurs de correction de temp\u00e9rature.<\/li>\n\n\n\n<li>Les parafoudres 1000V CC et 1500V CC sont con\u00e7us pour diff\u00e9rents niveaux de tension de syst\u00e8me photovolta\u00efque.<\/li>\n\n\n\n<li>La s\u00e9lection correcte du parafoudre \u00e9quilibre la tension nominale, le niveau de protection (Up) et les exigences du syst\u00e8me.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Que signifie la tension nominale d'un parafoudre DC ?<\/h1>\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\/08\/dc-spd-internal-components-structure-1024x576.jpg\" alt=\"Internal structure of a DC surge protective device\" class=\"wp-image-4356\" srcset=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/dc-spd-internal-components-structure-1024x576.jpg 1024w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/dc-spd-internal-components-structure-300x169.jpg 300w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/dc-spd-internal-components-structure-768x432.jpg 768w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/dc-spd-internal-components-structure-1536x864.jpg 1536w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/dc-spd-internal-components-structure-18x10.jpg 18w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/dc-spd-internal-components-structure-600x338.jpg 600w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/dc-spd-internal-components-structure.jpg 1672w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Principaux composants internes d'un parafoudre DC utilis\u00e9 pour la protection photovolta\u00efque<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">La tension nominale d'un parafoudre DC indique la tension continue maximale que le parafoudre peut supporter en permanence sans activer sa fonction de protection.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pour comprendre comment les parafoudres DC r\u00e9agissent lors d'\u00e9v\u00e9nements de surtension, consultez notre guide sur <strong><a href=\"https:\/\/cnkuangya.com\/fr\/blog\/how-dc-spd-works-operating-principles-components-engineers-guide\/\">le fonctionnement d'un parafoudre DC<\/a><\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pour les applications photovolta\u00efques, le param\u00e8tre de tension le plus important est :<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Ucpv \u2014 Tension maximale de fonctionnement continu pour les syst\u00e8mes PV<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Ucpv d\u00e9finit la tension maximale qui peut \u00eatre appliqu\u00e9e en continu au parafoudre pendant le fonctionnement normal du syst\u00e8me PV.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La valeur Ucpv s\u00e9lectionn\u00e9e doit \u00eatre :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u00c9gale ou sup\u00e9rieure \u00e0 la tension maximale du syst\u00e8me photovolta\u00efque<\/li>\n\n\n\n<li>Adapt\u00e9e \u00e0 la configuration du syst\u00e8me photovolta\u00efque<\/li>\n\n\n\n<li>Compatible avec le niveau de protection requis<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Par exemple :<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Caract\u00e9ristiques du parafoudre CC<\/th><th>Application courante<\/th><\/tr><\/thead><tbody><tr><td>Parafoudre CC 600V<\/td><td>Syst\u00e8mes photovolta\u00efques de petite taille<\/td><\/tr><tr><td>Parafoudre CC 1000V<\/td><td>Syst\u00e8mes photovolta\u00efques commerciaux et industriels<\/td><\/tr><tr><td>Parafoudre CC 1500V<\/td><td>Projets solaires \u00e0 grande \u00e9chelle et utilitaires<\/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\/08\/ucpv-selection-solar-pv-system-voltag-1024x683.jpg\" alt=\"Ucpv selection for solar PV DC SPD voltage rating\" class=\"wp-image-4357\" srcset=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/ucpv-selection-solar-pv-system-voltag-1024x683.jpg 1024w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/ucpv-selection-solar-pv-system-voltag-300x200.jpg 300w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/ucpv-selection-solar-pv-system-voltag-768x512.jpg 768w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/ucpv-selection-solar-pv-system-voltag-18x12.jpg 18w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/ucpv-selection-solar-pv-system-voltag-600x400.jpg 600w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/ucpv-selection-solar-pv-system-voltag.jpg 1536w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">La tension Ucpv doit \u00eatre s\u00e9lectionn\u00e9e en fonction de la tension maximale du syst\u00e8me photovolta\u00efque.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">S\u00e9lection du parafoudre CC bas\u00e9e sur la tension du syst\u00e8me photovolta\u00efque<\/h2>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">La s\u00e9lection du parafoudre CC d\u00e9pend de la tension maximale du syst\u00e8me photovolta\u00efque, des caract\u00e9ristiques des modules, des conditions de temp\u00e9rature et des exigences d'installation. La s\u00e9lection de la tension nominale correcte est la premi\u00e8re \u00e9tape avant de choisir le mod\u00e8le final de parafoudre.<\/p>\n<\/blockquote>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">Les principaux facteurs influen\u00e7ant la s\u00e9lection du parafoudre CC comprennent :<\/p>\n<\/blockquote>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Tension maximale du syst\u00e8me photovolta\u00efque<\/li>\n\n\n\n<li>Tension en circuit ouvert du module (Voc)<\/li>\n\n\n\n<li>Facteur de correction de temp\u00e9rature<\/li>\n\n\n\n<li>Niveau de protection requis (Up)<\/li>\n\n\n\n<li>Environnement d'installation<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">S\u00e9lection du parafoudre CC : Pourquoi la tension nominale est importante<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Choisir une tension nominale inadapt\u00e9e peut affecter la fiabilit\u00e9 du syst\u00e8me et les performances de protection.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"819\" src=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/dc-spd-selection-process-flowchart-1024x819.jpg\" alt=\"DC SPD selection process for solar PV systems\" class=\"wp-image-4358\" srcset=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/dc-spd-selection-process-flowchart-1024x819.jpg 1024w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/dc-spd-selection-process-flowchart-300x240.jpg 300w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/dc-spd-selection-process-flowchart-768x615.jpg 768w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/dc-spd-selection-process-flowchart-15x12.jpg 15w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/dc-spd-selection-process-flowchart-600x480.jpg 600w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/dc-spd-selection-process-flowchart.jpg 1402w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Une approche syst\u00e9matique pour s\u00e9lectionner la tension nominale correcte du parafoudre CC.<\/figcaption><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">S\u00e9lection d'un parafoudre avec une tension nominale trop faible<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Exemple :<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Un syst\u00e8me photovolta\u00efque a une tension maximale proche de 1200V DC, mais un parafoudre 1000V DC est install\u00e9.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Probl\u00e8mes potentiels :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Le parafoudre peut fonctionner au-del\u00e0 de sa plage de tension pr\u00e9vue.<\/li>\n\n\n\n<li>Les composants internes peuvent se d\u00e9grader plus rapidement.<\/li>\n\n\n\n<li>La fiabilit\u00e9 de la protection peut \u00eatre r\u00e9duite.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">La tension nominale du parafoudre ne doit jamais \u00eatre inf\u00e9rieure \u00e0 la tension maximale calcul\u00e9e du syst\u00e8me photovolta\u00efque.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">S\u00e9lection d'un parafoudre avec une tension nominale excessivement \u00e9lev\u00e9e<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Exemple :<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Un syst\u00e8me photovolta\u00efque de 600 V utilise un parafoudre CC de 1500 V.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Bien que le parafoudre puisse supporter la tension, il peut ne pas toujours offrir la protection la plus optimis\u00e9e.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Un parafoudre avec une tension nominale plus \u00e9lev\u00e9e peut pr\u00e9senter :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Un niveau de protection en tension (Up) plus \u00e9lev\u00e9<\/li>\n\n\n\n<li>Une marge de protection plus faible pour les \u00e9quipements sensibles<\/li>\n\n\n\n<li>Un co\u00fbt de produit plus \u00e9lev\u00e9<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">L'objectif n'est pas de s\u00e9lectionner la tension nominale la plus \u00e9lev\u00e9e, mais la tension nominale correcte.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Comprendre Ucpv, Uc et Up<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Lors de la s\u00e9lection d'un parafoudre CC, plusieurs param\u00e8tres de tension sont couramment utilis\u00e9s.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Ucpv (Tension maximale de fonctionnement continu pour les syst\u00e8mes photovolta\u00efques)<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Ucpv est le param\u00e8tre le plus important pour la s\u00e9lection d'un parafoudre CC photovolta\u00efque.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Il repr\u00e9sente la tension maximale que le parafoudre peut supporter en continu dans un syst\u00e8me photovolta\u00efque.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La valeur Ucpv s\u00e9lectionn\u00e9e doit \u00eatre sup\u00e9rieure \u00e0 la tension maximale possible du syst\u00e8me photovolta\u00efque.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Uc (tension maximale de fonctionnement continu)<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Uc est couramment utilis\u00e9 pour les parafoudres g\u00e9n\u00e9raux.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pour les applications sp\u00e9cifiques au photovolta\u00efque, Ucpv est normalement le param\u00e8tre cl\u00e9 car les syst\u00e8mes photovolta\u00efques pr\u00e9sentent des caract\u00e9ristiques de tension continue uniques.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Up (niveau de protection de la tension)<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Up repr\u00e9sente la tension maximale pouvant appara\u00eetre aux bornes de l'\u00e9quipement prot\u00e9g\u00e9 lors d'un \u00e9v\u00e9nement de surtension.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Un Up plus faible signifie g\u00e9n\u00e9ralement une meilleure performance de protection.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Lors de la s\u00e9lection d'un parafoudre, il convient de prendre en compte \u00e0 la fois Ucpv et Up.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Comment calculer la tension maximale du syst\u00e8me photovolta\u00efque<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">La tension maximale du syst\u00e8me photovolta\u00efque doit \u00eatre calcul\u00e9e sur la base de :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Nombre de modules photovolta\u00efques connect\u00e9s en s\u00e9rie<\/li>\n\n\n\n<li>Tension en circuit ouvert du module (Voc)<\/li>\n\n\n\n<li>Facteur de correction de temp\u00e9rature<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">La formule de calcul est :<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Tension PV maximale = Nombre de modules en s\u00e9rie \u00d7 Voc du module \u00d7 Facteur de correction de temp\u00e9rature<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">O\u00f9 ?<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Param\u00e8tres<\/th><th>Description<\/th><\/tr><\/thead><tbody><tr><td>Nombre de modules en s\u00e9rie<\/td><td>Nombre total de modules photovolta\u00efques connect\u00e9s en s\u00e9rie dans une cha\u00eene<\/td><\/tr><tr><td>Voc<\/td><td>Tension en circuit ouvert d'un module photovolta\u00efque<\/td><\/tr><tr><td>Facteur de correction de la temp\u00e9rature<\/td><td>Facteur d'ajustement de tension prenant en compte les conditions de basse temp\u00e9rature<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Exemple de calcul<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Une cha\u00eene photovolta\u00efque contient :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Nombre de modules connect\u00e9s en s\u00e9rie : <strong>24<\/strong><\/li>\n\n\n\n<li>Tension en circuit ouvert du module (Voc) : <strong>45V<\/strong><\/li>\n\n\n\n<li>Facteur de correction de temp\u00e9rature : <strong>1.10<\/strong><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Calcul :<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>24 \u00d7 45V \u00d7 1,10 = 1188V<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La tension maximale du syst\u00e8me photovolta\u00efque est :<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>1188 V CC<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Par cons\u00e9quent, un <strong>Parafoudre CC 1500V<\/strong> doit \u00eatre s\u00e9lectionn\u00e9 pour fournir une marge de tension suffisante.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Le calcul de la tension est la premi\u00e8re \u00e9tape de la s\u00e9lection d'un parafoudre CC. Pour une approche de dimensionnement compl\u00e8te incluant les calibres de courant et les exigences de protection, veuillez consulter notre guide sur <strong><a href=\"https:\/\/cnkuangya.com\/fr\/blog\/how-to-size-a-dc-spd-for-a-solar-pv-array\/\">comment dimensionner un parafoudre CC pour une installation photovolta\u00efque<\/a><\/strong>.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Note importante<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">La tension nominale du parafoudre CC s\u00e9lectionn\u00e9 ne doit pas \u00eatre inf\u00e9rieure \u00e0 la tension maximale calcul\u00e9e du syst\u00e8me photovolta\u00efque.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pour les applications photovolta\u00efques, le param\u00e8tre du parafoudre <strong>Ucpv<\/strong> doit \u00eatre \u00e9gal ou sup\u00e9rieur \u00e0 la tension photovolta\u00efque maximale calcul\u00e9e.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"819\" src=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/pv-system-voltage-calculation-dc-spd-selection-1024x819.jpg\" alt=\"PV system voltage calculation for DC SPD selection\" class=\"wp-image-4359\" srcset=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/pv-system-voltage-calculation-dc-spd-selection-1024x819.jpg 1024w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/pv-system-voltage-calculation-dc-spd-selection-300x240.jpg 300w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/pv-system-voltage-calculation-dc-spd-selection-768x615.jpg 768w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/pv-system-voltage-calculation-dc-spd-selection-15x12.jpg 15w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/pv-system-voltage-calculation-dc-spd-selection-600x480.jpg 600w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/pv-system-voltage-calculation-dc-spd-selection.jpg 1402w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Le calcul de la tension photovolta\u00efque maximale permet de d\u00e9terminer le calibre correct du parafoudre CC.<\/figcaption><\/figure>\n\n\n\n<h1 class=\"wp-block-heading\">Calculateur de s\u00e9lection de tension pour parafoudre CC<\/h1>\n\n\n\n<div class=\"spd-calculator\">\n\n<h2>Calculateur de tension pour parafoudre CC photovolta\u00efque solaire<\/h2>\n\n<p>\nCalculate the recommended DC SPD voltage rating based on your PV system parameters.\n<\/p>\n\n\n<label>\nNumber of PV Modules in Series\n<\/label>\n\n<input id=\"modules\" type=\"number\" placeholder=\"Example: 24\">\n\n\n<label>\nModule Open Circuit Voltage (Voc) (V)\n<\/label>\n\n<input id=\"voc\" type=\"number\" placeholder=\"Example: 45\">\n\n\n<label>\nFacteur de correction de la temp\u00e9rature\n<\/label>\n\n<input id=\"factor\" type=\"number\" value=\"1.10\" step=\"0.01\">\n\n\n<button onclick=\"calculateSPD()\">\nCalculate Recommended DC SPD\n<\/button>\n\n\n<div id=\"result\" class=\"result-box\">\n<\/div>\n\n\n<\/div>\n\n\n<style>\n\n.spd-calculator{\n\nmax-width:600px;\npadding:30px;\nborder:1px solid #ddd;\nborder-radius:10px;\nbackground:#fafafa;\nfont-family:Arial, sans-serif;\n\n}\n\n\n.spd-calculator h2{\n\nmargin-bottom:15px;\n\n}\n\n\n.spd-calculator label{\n\ndisplay:block;\nmargin-top:15px;\nfont-weight:600;\n\n}\n\n\n.spd-calculator input{\n\nwidth:100%;\npadding:12px;\nmargin-top:8px;\nborder:1px solid #ccc;\nborder-radius:5px;\nfont-size:16px;\n\n}\n\n\n.spd-calculator button{\n\nmargin-top:25px;\npadding:14px 20px;\nbackground:#d71920;\ncolor:white;\nborder:none;\nborder-radius:5px;\nfont-size:16px;\ncursor:pointer;\n\n}\n\n\n.spd-calculator button:hover{\n\nopacity:0.85;\n\n}\n\n\n.result-box{\n\nmargin-top:25px;\npadding:20px;\nbackground:white;\nborder-left:4px solid #d71920;\nfont-size:16px;\nline-height:1.7;\n\n}\n\n\n<\/style>\n\n\n\n<script>\n\nfunction calculateSPD(){\n\n\nlet modules =\nparseFloat(document.getElementById(\"modules\").value);\n\n\nlet voc =\nparseFloat(document.getElementById(\"voc\").value);\n\n\nlet factor =\nparseFloat(document.getElementById(\"factor\").value);\n\n\n\nif(!modules || !voc || !factor){\n\ndocument.getElementById(\"result\").innerHTML =\n\"Please enter all required values.\";\n\nreturn;\n\n}\n\n\n\nlet voltage =\nmodules * voc * factor;\n\n\n\nlet recommendation=\"\";\n\n\nif(voltage <=600){\n\nrecommendation =\n\"600V DC SPD\";\n\n}\n\nelse if(voltage <=1000){\n\nrecommendation =\n\"1000V DC SPD\";\n\n}\n\nelse if(voltage <=1500){\n\nrecommendation =\n\"1500V DC SPD\";\n\n}\n\nelse{\n\nrecommendation =\n\"Please consult an engineer for higher voltage applications.\";\n\n}\n\n\n\ndocument.getElementById(\"result\").innerHTML =\n\n\"<strong>Maximum PV Voltage:<\/strong> \"\n+ voltage.toFixed(0)\n+ \" V DC\"\n+\n\n\"<br><br><strong>Recommended DC SPD Voltage:<\/strong> \"\n+ recommendation;\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\">600V DC SPD vs 1000V DC SPD vs 1500V DC SPD<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Voltage rating is only one factor in DC SPD selection. The SPD type should also be selected according to the surge environment. Learn more about <strong><a href=\"https:\/\/cnkuangya.com\/fr\/blog\/type-1-vs-type-2-spd-for-solar\/\">Type 1, Type 2 and Type 1+2 DC SPD selection<\/a><\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Different PV system designs require different voltage-rated SPDs.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"819\" src=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/600V-DC-SPD-vs-1000V-DC-SPD-vs-1500V-DC-SPD-1024x819.jpg\" alt=\"600V 1000V and 1500V DC SPD comparison for solar PV systems\" class=\"wp-image-4360\" srcset=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/600V-DC-SPD-vs-1000V-DC-SPD-vs-1500V-DC-SPD-1024x819.jpg 1024w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/600V-DC-SPD-vs-1000V-DC-SPD-vs-1500V-DC-SPD-300x240.jpg 300w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/600V-DC-SPD-vs-1000V-DC-SPD-vs-1500V-DC-SPD-768x615.jpg 768w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/600V-DC-SPD-vs-1000V-DC-SPD-vs-1500V-DC-SPD-15x12.jpg 15w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/600V-DC-SPD-vs-1000V-DC-SPD-vs-1500V-DC-SPD-600x480.jpg 600w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/600V-DC-SPD-vs-1000V-DC-SPD-vs-1500V-DC-SPD.jpg 1402w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Different PV applications require different DC SPD voltage ratings.<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>SPD Voltage Rating<\/th><th>Applications courantes<\/th><th>Typical Systems<\/th><\/tr><\/thead><tbody><tr><td>Parafoudre CC 600V<\/td><td>Small PV installations<\/td><td>Residential rooftop systems<\/td><\/tr><tr><td>Parafoudre CC 1000V<\/td><td>Medium and large PV systems<\/td><td>Commercial and industrial projects<\/td><\/tr><tr><td>Parafoudre CC 1500V<\/td><td>Large-scale PV systems<\/td><td>Utility solar farms<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The correct selection depends on the calculated maximum PV voltage, not only the project size.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Real Application Examples<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Example 1: Commercial Rooftop PV System<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">System information:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>PV modules in series: 22<\/li>\n\n\n\n<li>Module Voc: 42V<\/li>\n\n\n\n<li>Temperature correction factor: 1.10<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Calcul :<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">22 \u00d7 42V \u00d7 1.10<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">= <strong>1016V DC<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Recommended selection:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Parafoudre CC 1500V<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Raison :<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">After temperature correction, the PV voltage exceeds 1000V.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Example 2: Industrial Solar Project<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">System information:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>PV modules in series: 18<\/li>\n\n\n\n<li>Module Voc: 45V<\/li>\n\n\n\n<li>Temperature correction factor: 1.10<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Calcul :<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">18 \u00d7 45V \u00d7 1.10<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">= <strong>891V DC<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Recommended selection:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Parafoudre CC 1000V<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Raison :<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The calculated PV voltage is below 1000V.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Common Mistakes When Selecting DC SPD Voltage<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">1. Selecting SPD Based Only on Inverter Voltage<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The inverter input range does not always represent the maximum PV array voltage.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">SPD selection should be based on PV string voltage.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">2. Ignoring Module Voc<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Using Vmp instead of Voc may underestimate the maximum PV voltage.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">3. Choosing Higher Voltage Without Checking Up<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A higher voltage-rated SPD may not always provide better equipment protection.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The Up value should meet the protection requirements of the system.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">4. Ignoring Temperature Effects<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">PV module voltage increases at low temperatures.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Temperature correction should be considered during system design.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Questions fr\u00e9quemment pos\u00e9es<\/h1>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">What voltage DC SPD do I need for a 1000V solar system?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A DC SPD with a suitable Ucpv rating should be selected based on the actual maximum PV system voltage. The calculated PV voltage should always remain below the SPD voltage rating.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Can I use a 1500V DC SPD on a 1000V solar system?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A 1500V DC SPD may be used in some applications, but the protection level (Up), system requirements and cost should also be considered.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Is a higher DC SPD voltage rating always better?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">No. The SPD voltage rating should match the PV system requirements. A higher voltage rating does not automatically provide better protection.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">How do I calculate PV system voltage for SPD selection?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Calculate the maximum PV voltage using:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Number of series modules \u00d7 Module Voc \u00d7 Temperature correction factor.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">What is Ucpv in a DC SPD?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Ucpv is the maximum continuous operating voltage that a photovoltaic SPD can withstand during normal operation.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">What standard applies to photovoltaic DC SPD?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Photovoltaic surge protective devices are mainly covered by:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><a href=\"https:\/\/webstore.iec.ch\/en\/publication\/26931\" rel=\"noopener\">IEC 61643-31<\/a>: Low-voltage surge protective devices \u2013 Requirements and test methods for SPDs for photovoltaic installations<\/strong>.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Technical References<\/h1>\n\n\n\n<ul class=\"wp-block-list\">\n<li>IEC 61643-31: Surge protective devices connected to photovoltaic installations<\/li>\n\n\n\n<li>IEC 62548: Photovoltaic arrays \u2014 Design requirements<\/li>\n\n\n\n<li>IEC 60364-5-53: Low-voltage electrical installations protection requirements<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"819\" src=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/kuangya-dc-spd-solar-protection-solution-1024x819.jpg\" alt=\"KUANGYA DC SPD solution for solar PV protection\" class=\"wp-image-4361\" srcset=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/kuangya-dc-spd-solar-protection-solution-1024x819.jpg 1024w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/kuangya-dc-spd-solar-protection-solution-300x240.jpg 300w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/kuangya-dc-spd-solar-protection-solution-768x615.jpg 768w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/kuangya-dc-spd-solar-protection-solution-15x12.jpg 15w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/kuangya-dc-spd-solar-protection-solution-600x480.jpg 600w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/kuangya-dc-spd-solar-protection-solution.jpg 1402w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">KUANGYA provides DC SPD solutions for solar photovoltaic applications.<\/figcaption><\/figure>\n\n\n\n<h1 class=\"wp-block-heading\">Conclusion<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Selecting the correct DC SPD voltage rating is essential for reliable solar PV system protection.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The correct choice depends on:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Tension maximale du syst\u00e8me photovolta\u00efque<\/li>\n\n\n\n<li>Module Voc<\/li>\n\n\n\n<li>Temperature conditions<\/li>\n\n\n\n<li>Required protection level<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">For common photovoltaic applications:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Small PV systems often use 600V DC SPD<\/li>\n\n\n\n<li>Commercial PV systems commonly use 1000V DC SPD<\/li>\n\n\n\n<li>Utility-scale PV systems commonly use 1500V DC SPD<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">KUANGYA provides <a href=\"https:\/\/cnkuangya.com\/fr\/dc-spd\/\">DC SPD solutions<\/a> for solar photovoltaic applications, including 600V, 1000V and 1500V DC models with OEM customization support.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Ressources connexes<\/h1>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/cnkuangya.com\/fr\/blog\/how-dc-spd-works-operating-principles-components-engineers-guide\/\">How a DC SPD Works: Operating Principles, Components and Engineer Guide<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/cnkuangya.com\/fr\/blog\/type-1-vs-type-2-spd-for-solar\/\">Type 1 vs Type 2 vs Type 1+2 DC SPD for Solar PV<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/cnkuangya.com\/fr\/blog\/how-to-size-a-dc-spd-for-a-solar-pv-array\/\">Comment dimensionner un SPD DC pour un groupe solaire PV<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/cnkuangya.com\/fr\/blog\/dc-spd-for-solar-installations-in-spain\/\">Parafoudre CC pour installations solaires en Espagne : guide en 10 \u00e9tapes<\/a><\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>A Practical Guide to Choosing 600V, 1000V and 1500V DC Surge Protective Devices Introduction DC SPD selection is one of the most important steps in designing a reliable solar photovoltaic (PV) protection system. Selecting the correct voltage rating of a DC Surge Protective Device (DC SPD) ensures reliable protection performance and long-term system stability. Many [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":4355,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[35],"tags":[],"class_list":["post-4354","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\/4354","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=4354"}],"version-history":[{"count":1,"href":"https:\/\/cnkuangya.com\/fr\/wp-json\/wp\/v2\/posts\/4354\/revisions"}],"predecessor-version":[{"id":4362,"href":"https:\/\/cnkuangya.com\/fr\/wp-json\/wp\/v2\/posts\/4354\/revisions\/4362"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cnkuangya.com\/fr\/wp-json\/wp\/v2\/media\/4355"}],"wp:attachment":[{"href":"https:\/\/cnkuangya.com\/fr\/wp-json\/wp\/v2\/media?parent=4354"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cnkuangya.com\/fr\/wp-json\/wp\/v2\/categories?post=4354"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cnkuangya.com\/fr\/wp-json\/wp\/v2\/tags?post=4354"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}