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I am missing one of the cables for my Growatt 5000 needed for a parallel setup. Signature Solar is out of them, and they can't seem to tell me if it is a straight through db9 rs 232 serial cable, because if I knew, I would just get one elsewhere instead of waiting for them to get...

I've been using the Growatt SPF 5000 ES-US 48 volt inverter since around November of 2021. It's done some strange things lately. It is connected to the Utility. I have 5 of the LifePo4 batteries. I have 2 strings of 2800 watts (14 x 200 watts in series) of panels in parallel. The output...