Quick Answer
To choose lightning protection for solar panels, select a system that meets or exceeds the IEC 61643-1 standard, which ensures protection against direct and indirect lightning strikes. Consider the solar array's size, location, and environmental conditions when selecting a system. Look for systems with a high surge current rating.
Choosing the Right Surge Arrester
When selecting a lightning protection system for a solar combiner box, it’s essential to choose a surge arrester that can handle the maximum voltage and current ratings of the system. A typical surge arrester for a solar combiner box should have a voltage rating of 1000V AC or higher and a surge current rating of at least 10 kA. For example, a 1000V arrester with a 10 kA current rating can protect a solar combiner box with a maximum power rating of 30 kW.
Considering the Installation Location
The installation location of the surge arrester and solar combiner box is crucial in determining the effectiveness of the lightning protection system. Ensure that the surge arrester is installed in a location that is easily accessible and protected from the elements. The solar combiner box should also be installed in a location that is protected from direct lightning strikes, such as a roof or a freestanding structure.
Selecting the Right Installation Method
The installation method of the surge arrester and solar combiner box is also critical in ensuring the effectiveness of the lightning protection system. The surge arrester should be installed in accordance with the manufacturer’s instructions and the relevant national and international standards. The solar combiner box should also be installed with proper grounding and bonding to ensure that any electrical surges are directed to the ground and not to the solar array or other equipment.
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