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You don't need ground with CANBus; and on top of that a good BMS has isolated CAN especially when dealing with HV batteries. The sungrow is a sensitive inverter protocol wise. A wrong setup there can cause resets etc.

66/16 = 4.1 looks perfect to me.

Send me a link where i buy LifePo4 cheaper then secondlife EV batteries? Anyway we deviate a bit about the original question. I think LV/HV should depend on total system size etc. For smaller installations i think LV is perfect. Edit: I already made most of the BMS for my EV planning is now to...

Its about building my own BMS, so didn't bought yet the inverter. I want to use HV inverter with EV battery.

Question people; How do i know if my inverter supports this V1.3 protocol? Which product from pylontech uses V1.3? Does the voltage has anything todo with it?