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Suggested string layout for my install?

Bitslizer

Member
Jun 16, 2021
235
80
IL
Total newbie. Ordered Tesla Solar Panel + 2 PW, hopefully going through the final redesign before submitting for permit

Western Burb of Chicago, just about EAST-WEST aligned roof. Due to local rules, inverter are size limited (cant get larger) so I'm stuck with a Tesla 7.6+3.8 for a total of 6 strings possible.

Front of house face east and back face west. For looks and to better match generation to use I'm opting to put most of my panels WEST (although PVwatts say I get "slightly" better output on the east side) Attached is my proposal back to Tesla, they had most of the panel facing east, and not enough setback for local code anyway. Total 46 panels for 15.64, which max out the 7.6+3.8= 11.4kw X 1.4x max DC/AC oversize = 15.96kw for Tesla inverter. I'm currently on flat rate net metering 1:1 credit, TOU is being piloted but not fully rolled out, so I can see if it will be financially attractive to switch to TOU in the future with mostly west facing panels

What do you guys think will be the best String configuration? Will I be able to talk to the install crew to wired them up the way I want?

I'm thinking to split both inverters' strings for both east and west, to best minimize clipping.
ie if the 3.8 take 15 panels in 2 strings facing west it would be 5.1w clipped to 3.8kw MOST of the afternoon
(the 3.8 can only take max 15 panels anyway so at least 1 inverter HAS to do a east west split anyhow)

Idea 1 2 string east, 4 string west,
7.6
String 1 East - 9 Panels - East 3.06kw
S2W-7P
S3W-7P
S4W-8P - Subtotal west 7.48kw

3.8
S1E-7P - 2.38
S2W-8W -2.72

Idea 2 3 east, 3 west
7.6
S1E-5
S2E-5 - East 3.4
S3W-10
S4W-11 - West 7.14

3.8
S1E-6 2.04
S2W-9 3.06


I'm thinking Idea 2 would be better as the 7.6 has a smaller west facing loading.

If you guys have other ideas/proposal, I'm all ears. Thanks in advance!
 

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