AlWil

OK. It looks like I got it working: I had to make a custom cable using the pin outs provided by Pylontech and posted in the thread above. I am using the bms port on the inverter and the rs485 port on the battery. I am using protocol L02 on the Growatt.

I have just installed 3 pylontech us3000c and a Growatt spf 5000 es. With the settings I see here and elsewhere (using lithium battery setting and either protocol 02 or protocol 52) I get fault 20, and 4, consistently when using the li setting in setting 5. My dipswitches read 1000 (upside down because they are installed that way) I have tried using the can port and the rs485 port. No change. I even called Growatt (us) customer service and, get this, they told me that the proper setting for my batteries is us2 and then to manually set charge values in settings 19,20,21! I would like to use the proper lithium protocol and communicate with the bms. I can make a new cable if that is what is needed. Can someone help get this going?