When I was first inspecting PV I was told that the total of the PV breaker + the main breaker could not equal more than 120% of the bus rating of the panel

I have one now where they have a 200 amp bus, derating the main to 175 and installing a 70 amp PV breaker and I said that was not allowed. His argument is that he only has 63 amps of solar back feed.

Opinions.

I have one now where they have a 200 amp bus, derating the main to 175 and installing a 70 amp PV breaker and I said that was not allowed. His argument is that he only has 63 amps of solar back feed.

Opinions.

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