I have a pool sub-panel with four #6 AWG running in 1" schedule 40 PVC conduit in ground under the pavers. We are planning on adding some solar panels above pool equipment. I was thinking, instead of tearing up all of our pavers to lay new conduit, to run those four #8 over the same conduit.
My question is, Can I run four #6 and four #8 stranded THWN Wire over 1 inch schedule 40 PVC conduit?
I can run the ground wire to the pool sub-panels bus bar and that will eliminate an extra #8 wire over conduit. Would that work? BTW. the pool sub is 40A circuit but it runs #6 wire over 70'. I was trying to use conduit calculator mentioned in the link but it's no longer available. I was thinking of back-feeding the solar to the pool sub (it's 100 amp rated) but I'm facing an issue when (pure sine inverter 8000W) generator is on and it will turn on the solar which is not what I want. My main solar array is interconnected on the service side and shut down when there is power outage. What I want, is to run that little array back to the solar junction box where it would be monitored and manage just like the other panels.
Now that I think about it, I can probably getaway with #10 or even #12 wire for the solar as it's only 4 panels 330w each but microinverters are rated at 240w 240V.