Thank you Chris, really appreciate your help. I made the cable and selected the Pylontech option - it appeared to work, but then I have the MPPT kicking out every few minutes. Pylontech BMS is the wrong protocol to use. Tried LIB BMS but then get the Error 61. Will check the forum some more to see if there is a posted BMS protocol in the Axpert King2 that will work with the Greenrich battery.