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2019 solar prep was with 10 gauge wiring. The max current you can put through 10 gauge wire is 30A. I have four 200W panels wired 2S2P. This puts 42vdc @ 18A into my Victron 100/30 MPPT.
Yes I'm way over paneled for a 100/30. My next upgrade will be a 150/85 MPPT.
If I was doing it all again I would have installed unistrut rails, Renogy tilt mounting brackets and a 150/85.
Think about future expansion in your plans.
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