I'm running a SOLAX XHybrid SK-SU3700 inverter and have pins 1&2 (CAN-H, CAN-L) at the inverter linking to pins 4&5 (CAN-H, CAN-L) at the battery (RJ45 plug in A-CAN port of master battery and that seems to be working (no BMS Lost message on inverter) - I got this info from Pylontech after myself having cabling problems. Oddity though is that the Battery capacity reported by the Inveter drops quickly from 100% (over 30mins) to stabilise at 50% for the majority of the battery capacity life (as observed by the lights on the front of the batteries) and then slowly drops to around 45%....