So What Is the 120% Solar Rule? The 120% rule is quite straightforward: it dictates that the combined amperage of your solar power and grid electricity cannot exceed 120% of your main service panel's rated capacity.
Connecting more solar panels than an inverter can handle may lead to overloading, inefficiency, and potential damage to the system. If the inverter exceeds its capacity, it enters a "clipping" mode, which limits additional power during peak sunlight hours, thus reducing overall.
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