Solar Backfeed Breaker Size
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To calculate the fuse size required between the string and the inverter s dc input you take 9 12 x 1 56 14 7 and round up to the next trade size of 15a.
Solar backfeed breaker size. If a 200 a busbar has a 200 a main breaker the code allows adding a up to a 40 a backfeed breaker. Select the breaker size that can carry the current with common breaker sizes being 30 amps 40 amps or 50 amps. We sometimes see people adding a 60 or 80 a breaker instead. Now these are often included with some inverters but it s a good idea to check.
The sizing of back feed breakers is another point of difficulty. Then looking at that photo again you can see i have a 30a 2 pole breaker at the other end for my solar inverter. Understand that corresponds to 32a of pv current maximum. The nec allows adding a back feed breaker so that the current supply is up to 120 of the rating of the bus bar.
Nec705 12 b 2 3 b states that where there are two power sources the grid and the solar inverter the sum of their breakers cannot equal more than 120 of the busbar rating of the breaker box. However if we add our pv breakers into a sub panel that is dedicated to only the pv breakers we can land the sub panel into a 40a breaker in the main panel board 10 4a 21a 31 4a x 1 25 39 25a.
