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Wondering how to know if an SPD is bad? The status indicator is usually the first place to check, but it cannot tell you everything about the condition of a surge protective device. A surge protective device (SPD) can continue…

You open the solar distribution box, look at the surge protective device, and see a green indicator. The SPD green indicator looks normal, but does that mean the system is actually protected? Everything looks normal. So does that mean the…

SPD distance from inverter is an important part of solar PV surge protection design, especially when the SPD is installed in a combiner box or near the PV array. You have installed a DC surge protective device in the PV…

A solar inverter built-in SPD can provide important surge protection, but seeing “DC Type II SPD” on the datasheet does not automatically mean the entire PV system is protected. Sometimes the specification even says: Built-in Type II DC & AC…

A DC surge protective device may look simple from the outside, but the markings printed on its label contain important information about where the SPD can be used and how it performs. Consider this example from a 1000V DC solar…

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…

When comparing Type 1 vs Type 2 SPD for solar applications, Type 1, Type 2 and Type 1+2 SPDs should not be treated as three quality levels of the same product. They are intended for different surge conditions. In many…

Solar photovoltaic systems are exposed to transient overvoltages caused by nearby lightning activity, switching operations, and disturbances transmitted through connected electrical circuits. These events may damage inverters, monitoring equipment, combiner boxes, and other sensitive components. Choosing the correct DC SPD…

A 250A DC MCCB for 48V ESS can be a suitable choice for some battery energy storage systems, but the labels “48V” and “250A” alone are not enough to confirm compatibility. Before selecting the breaker, you must verify the inverter’s…

Quick answer: A 48V energy storage system may be classified as low voltage, but it can carry hundreds of amperes. A correctly selected 48V DC circuit breaker helps protect battery cables, busbars and inverter input circuits against overcurrent and short-circuit…