I have 3 MultiPlus-II 48/3000/35 in ESS grid-tie configuration with external control mode.
They are controlled with external bms and 2-wire bms configuration.
Relays switch AUX1 and AUX2 depending on allow charge/disable discharge. When relays are open charge/discharge is stopped.
This works great for "Allow charge". When AUX1 is tripped - it will stop all charging. (battery almost full)
But att the other end of battery state of charge. If Battery is almost empty AUX2 is tripped. Disable discharge (and of course charge is enabled). Grid set point is -20 at all times.
When AUX2 is tripped, the MultiPluses starts to charge att maximum capacity. They just don't stop discharge, they force them self into max charge.
If both AUX1 and 2 is tripped charge and discharge not allowed - it will stop charge and discharge.
1. AUX1 and AUX2 tripped = all activity stops
2. AUX1 is tripped= charge stops
3 AUX2 is tripped = discharge stops - BUT FULL charging starts
Is this a bug in the MultiPlus-II? Or have I missed some configuration setting?