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Hi, I like your project and had been meaning to provide some feedback for a while now on my use and experience. Up until yesterday I had connected this up to my JK-B2A20S20P BMS and 2 Growatt SPF5000ES inverters. Inverter setting 5 to "LI" and setting 36 to "52". I'm now using a slightly...

From what I understand of the manual, do not parallel the PV strings. You can have one string attached (6 x 550W) to one inverter. In your case 2 strings (3 x 550W) one to each inverter will probably not work as the VoC will be less than 150V. Inverter needs 150VoC to startup.