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Solar technician inspecting solar panels on a rooftop, illustrating the 20% rule for solar system sizing and installation.

What Is the 20% Rule for Solar?

The 20% rule for solar is shorthand for the 120% rule in the National Electrical Code. It limits how much solar can connect to your home’s main electrical panel through a standard breaker. On a typical 200 amp panel, that usually leaves room for a 40 amp solar breaker. It

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