NEC 2017,705.12(B)(2)(3)(C)

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jaggedben

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Location
Northern California
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Solar and Energy Storage Installer
This is actually a Sunpower Sunvault Storage System with a hub plus. My question is whether I’m limited on the sum of the non-back up breakers left in MSP to 125? ...
I believe the answer is yes, you're limited to 125A. You can't use the 120% rule because the solar+battery output is more than 56A. Unless the Sunvault is a listed Power Control System that can limit the total output to 56A, which I'm not aware of.

Other options might be to downsize the MSP main breaker to 175A, or to downsize the breaker going to the Hub+.
 
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