Originally Posted by

**jaggedben**
Strictly speaking, unless you're still on the 2011 NEC or older, it's the inverter output that counts and not the breaker size. But is correct that 40A is the limit (after multiplying by 125%.) 120% of 200 is 240. 240-200=40. [I'm assuming the panel's main breaker is 200A, although you didn't say that.]

If you're nameplate total inverter output is 39A, then your backfeed calc is 39A*1.25=48.75A. So you are not compliant.

One solution might be to do a load calculation and downsize the main breaker to 175A. Then 240-175=65 and you have enough 'headroom.'

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