DanieT Posted November 26, 2020 Share Posted November 26, 2020 I recently had a complete solar system installed at my house in Pretoria. 12 X 410W Canaidian panels, Goodwe GW5048D-ES inverter, 2 X Blue Nova BN52V-100-5.2k batteries. Sadly the installer never came back. The system works but is currently set to BackUp mode, so the batteries don't discharge. The PV Master overview shows: BMS status: Battery Communication Fail. Battery Selected: Self Define The goodwe Manual indicate: CAN-H on Pin 4 CAN-L on Pin 5 Blue Nova Manual indicate: CAN-H on Pin 7 CAN-L on Pin 8 The Communication cable is plug in at BMS and CAN is open. Is there anybody here that could help with the protocall setup to fix the BMS communication? Quote Link to comment Share on other sites More sharing options...
Mad Mike Posted November 29, 2020 Share Posted November 29, 2020 @DanieT I suspect that the nova blue batteries aren’t on the compatible list for the Goodwe (the list is very short unfortunately). If my assumption is correct then your installer left the system in the “best” working condition. the Goodwe plays nice with the battery when it can “talk” to it. In the general mode you will experience situations where the battery % will be very errantic and the inverter will for instance go from a 90% reading and drop vertically to 10% when discharging. You may see the same behavior when charging. my personal experience has been that to get round this problem I have had to oversize my DIY battery. But even then after 2-3 days of rain I will still hit that wall and the inverter will dip and then shutdown ignoring the 30% cutoff I set in the Goodwe battery setting. in short it is possible to use the general mode but your expectations and wiring may have to change to accommodate the new normal behavior of your system. hope my rumbling answer has helped. Happy to share specific experience if you are going to change your settings... Quote Link to comment Share on other sites More sharing options...
DanieT Posted November 30, 2020 Author Share Posted November 30, 2020 Mike, Goodwe BMS indicate CAN_H on pin 4 and CAN_L on pin 5. Blue Nova CAN Bus indicate CAN_H on pin 7 and CAN_L on pin 8 The BMS was set to Back-up mode in PV Master. So I belive there is no communication. The coms cable is currently plugged into the Goodwe BMS port. Quote Link to comment Share on other sites More sharing options...
FixAMess Posted November 30, 2020 Share Posted November 30, 2020 Don't you need to rewire the cable between the BMS and Inverter so the pins align correctly? Quote Link to comment Share on other sites More sharing options...
DanieT Posted November 30, 2020 Author Share Posted November 30, 2020 Yes, I believe so. It could be made up. From what I understood, neither Goodwe nor Blue Nova supplies an adapter / changeover cable to rectify the problem. To me that should be an off the shelf accessory. Quote Link to comment Share on other sites More sharing options...
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