JK BMS + Multi RS Solar protocol issue

Q&A and troubleshooting
, ,
1
  • Jkong inverter BMS (latest firmware)
  • Victron Multi RS solar (latest firmware)

As I connect the battery to Multi RS via CAN (switch GX to the Can-bus BMS LV protocol) - all standard indicators like load, and PV disappear.

photo_2024-11-18_18-34-28
photo_2024-11-18_18-34-281280×960 153 KB

photo_2024-11-18_18-34-28 (2)
photo_2024-11-18_18-34-28 (2)1280×960 149 KB

The battery’s SOC (State of Charge) shows correctly, but it doesn’t synchronize with the inverter and GX (the inverter maintains its own values - visible on the inverter’s display).

When I switch back to the Lynx Ion BMS protocol, the indicators return, but the connection with the Jk BMS disappears…
Using a type A cable (genuine Victron).

photo_2024-11-18_18-34-27
photo_2024-11-18_18-34-271280×960 162 KB

The problem, I think, lies in the fact that it connects via VeCan (unlike the Multiplus, which uses VeBus). And when you change the protocol, it starts to recognize the BMS but loses sight of everything else. I wonder if this can be resolved somehow?

2

It can be an underlying (temporary) problem with CAN ports on the Cerbo MK2, which is mentioned on this community in several places now.

Still, I will follow with interest this, because I already have a Multi RS Solar and I was thinking in getting a battery with JKBMS…