Multiple strings, multiple roofs, and ac combiner boxes

[bryankloos]

What is the standard approach for an an install with two roofs, and multiple strings and ac combiner boxes?

Array 1: 40 panels. 3 strings. Enphases micro inverters. West roof. Solodeck under the array
Array 2: 21 panels. 2 strings. Enphases micro inverters. East roof. Solodeck under the array

I want to have no exposed conduit hence the two solo decks. Once in the attic, what is the approach for combining the two single leads from each roof, another combiner box and then single run down to the service?

Thanks

Bryan

[Mike90250]

Each install is going to be different. your issue will be getting the total size of the arrays to be allowed into your main power panel.

[bryankloos]

I'm using line side tap to connect.
I'm more curious about how/where to combine the two sub arrays.
From my understanding the larger array with three strings needs to have breakers at the combiner.
I'd like to keep all breakers accessible in the attic at the roof penetrations. Seems easiest would be to use 2 solo decks and then bring the two sub arrays together in a 5 string ac combiner in the attic. From there run a single line to the service panel/disco/meter etc.

I'd like to keep combiner breakers accessible from the inside of the attic and not the roof.

[ncs55]

You could simply penetrate the roofs and have all of the circuits enter an AC sub panel somewhere accessible after the solodecks with breakers. Midnite Solar has a few options for what you are looking for as well. Installers out here are putting a 240V switch in a weatherproof box at the arrays for use as a disconnecting means for each branch circuit to meet our code requirements. Lightning arrestors would also be a good idea. http://www.midnitesolar.com/productP...Name=Combiners - AC Micro Inverter (Example - Enphase)&productCat_ID=48&sortOrder=4&act=p