This summer we’ve installed a Victron system in our home. The setup is as followed:
- 3 phase system with Victron Multiplus 5000va version.
- 2x 15kw JK bms box with Eve 280amp batteries.
- Lynx Distribution and battery box to attach the batteries to the victron.
- 4kw solar panels attached to the victron AC in.
- 1 powermeter at the net connection.
- CerboGX
Both bms’s are connected to the CerboGX with the right protocol.
BMS type is JK-PB hardware 15 with firmware version 41. BMS settings are the same as offgrid garage.
The JK bms’s are known for the bad current measurement. This can be seen when there is no sun for a few days. The SoC drops rapidly to 0 while there is still sufficient energy in the battery.
To solve this, I set the battery monitor to Ve-bus. Sorry I currently don’t have a picture of the charging voltage.
The issue now is that the batteries won’t charge fully. Charging stops around cell voltage of 3.35V and stays there for days. The voltage of the victron DC side is somewhere around 55V but the batteries tell me its around 53.6.
The only solution to let the batteries charge 100% is to set the battery monitor back to bms. But this is not the desired solution because the SoC of the bms is not accurate enough.
ESS is enabled and DVCC as well:
I’m asking for help how to solve this problem? I want the Multiplus to determine the SoC and let the bms handle the charging part. Perhaps a Lynx Shunt would do the job?
Strange thing is that the VE-bus has a different voltage then the bms pack voltage… what i don’t understand.
My theory would be that the VE-bus voltage is already 55,2V and therefore it would not charge anymore.
My battery parameters:
