Quick Answer
To determine the right size for a surge protector, multiply the total wattage of the solar array by a safety factor of 2 or more, considering the desired level of protection against voltage spikes and lightning strikes.
Calculating Surge Capacity
When sizing a surge protector for a solar array, it’s essential to consider the total power output of the system. A typical off-grid solar array can range from 2 kW to 10 kW or more, depending on the system’s design and intended use. To calculate the surge capacity, multiply the total wattage of the solar array by a safety factor of 2 or more. For example, a 5 kW solar array should have a minimum of 10 kW surge capacity to account for voltage spikes and lightning strikes.
Choosing the Right Surge Protector
When selecting a surge protector, look for devices with high surge capacity ratings and a high level of protection against voltage spikes (typically 2000-3000 volts or higher). The device should also have a low let-through voltage (LTV) rating, which indicates the maximum voltage that can pass through the device during a surge event. A lower LTV rating (e.g., 1.5 kV or lower) is generally safer for sensitive electronic equipment.
Installation and Maintenance
When installing a surge protector, ensure it is properly grounded and connected to the solar array and electrical panel. Regular maintenance is essential to ensure the surge protector continues to function as intended. Check the device’s voltage and current ratings regularly, and replace the surge protector as needed to maintain optimal performance and protection.
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