Electrical Planning & Diagram for Permit

[jmoles]

I'd love to get some feedback on my current electrical planning & permit diagram.

Plans are for (30) 400w solar panels with (15) AP Power DS-3 microinverters. A 30 amp breaker can take up to 9 DS-3 micro inverters.

I'd derate the main breaker to 175 and putting in (2) 30 amp breakers.

Do I need to put the (2) 30 amp breakers in the diagram and show the wiring for each breaker from the junction box to the MSP?

Attached is the diagram I currently have.

 

[solar-mike]

1.- The symbol in the modules/micros show a single module per micro, I'd recommend changing that to a dual module micro symbol.

2.- The junction box should just make the transition of PV Wire to THWN.
3.- A 125A subpanel with 3 x 20A Breaker (one for each string) is required.*
4.- If you want to perform the Derate (and a 50A breaker tie-in)you will require electrical load calcs and add them to your permit package. (Review with your AHJ if the Line side tap is not an option)

*You can use 2 strings (1 with 18 mods & 9 micros - 1 with 12 mods & 6 micros) with 30A and 20A Breakers instead of 3 strings to minimize wire count and conduit runs.