A bug in firmware V15.17 on the JK Inverter BMS can cause your battery to be Force Charged if the 'wrong' CAN protocol us set. I say 'wrong' protocol, but there is a Deye CAN protocol, however if you use this for communication to a ‪@sunsynk‬ (Deye) Inverter, this 'Force Charge' will happen.

If the 001: Deye Low Voltage Hybrid Inverter CAN Protocol is selected in the BMS, this will enable the Request Force Charge function on the Inverter, and your battery will be charged from the grid (if no solar power is available) and won't be allowed to discharge under normal conditions. If grid failure occurs, battery power will be used as normal.

It seems like for everything to function as normal, the 002: PYLONLowvoltageV1.2 CAN protocol needs to be selected.

Make sure you do all of your own testing when making changes as not all functions have been checked / tested using Firmware 15.17.

I am using Hardware Version 15 of the JK Inverter BMS.

Firmware Version 15.11 did not have this 'Force Charge' problem, but it seemed to have an issue when multiple batteries (BMS's) are used in parallel, the SOC would not be aggregated and reported to the Inverter correctly.

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