Quick Answer
The size of a solar array affects surge protection needs because larger arrays have a higher risk of lightning strikes, which can cause electrical surges that damage equipment. As the array size increases, so does the risk of electrical discharges. Surge protection devices must be sized accordingly to prevent equipment failure.
Larger Arrays Require More Surge Protection
When designing a surge protection system for a solar array, it’s essential to consider the array’s size and corresponding risk of lightning strikes. A larger array may require additional surge protectors to handle the increased electrical discharge potential. For example, a 10 kW array may require a 20 kA surge protector, whereas a 5 kW array could use a 10 kA protector.
Surge Protection Device Sizing
To determine the required surge protection device (SPD) rating, you need to calculate the short-circuit current (Isc) of your solar array. This is typically done using a solar array short-circuit current calculator or by consulting the manufacturer’s specifications. For instance, a 10 kW solar array with a maximum short-circuit current of 50 A might require a surge protector rated for 50 kA or higher.
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