sub panel wire/breaker question
The 12 panels are in 4 strings currently 80' from other equipment and feed the Flexmax 80 at 90-100 VDC, run in 8/2 with ground UF_B, That then goes to the 804 AH GB Industrial battery a few feet away. At the new house I have built a south south summer shade soffitt above the 8' high direct gain window wall which is designed to carry another future string of PV should we ever require. I have installed a 100 amp sub panel at the new house, planned to feed it from a 60 amp breaker in the first panel and supply it with 6/2 UF-B with ground. Since the Inverter we have can only supply 3500 kv, I believe that wiring (6/2) will be adequate, 3500/120vac=29 amps. If we should however decide to add the extra string, and its own CC I might wish to consider a second inverter, In that case would the 6/2 be inadequate? I cannot find any heavier guage in UF-B so what should I do? I only want to did that ditch one last time! Inspections are not an issue out here BTW, and I have tried several times to connect with professional installers in the region and no one seems to be willing to go near a home built system. I suppose they have their own trust issues about giving paid advice. Don't blame them.
Off grid, all solar, passive and active ( winter wood heat supplements) solar DHW, no backup.
Array 1-- 12 Sunpower 250, Outback FM 100
Array 2-- 12 Sunpower 250, Outback FM 100
Well array 780w, 6 Kyocera 130 w with Grundfos sqflex 11 and cu200 to elevated storage, ( 2- 330 g tanks,) no battery storage at well
6 24 volt Battle Born Lithiums
Outback FlexpowerTWO, VFX 3524a