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Thank you. Yes, I'll do the numbers and I think you are correct that a 2s2p would be a better way to go for each charge controller.

I'm planning to install two rows of four 455W solar panels. Each row of four in series. I figure I'll need to run two separate charge controllers. One for each string of four due the high voltage. Is there any reason that both charge controllers can not be connected to the main bus bar at...