HI everyone,
I have 2x 12V Rolls 5000 flooded batteries 337Ah, 250/100 MPPT and Multiplus II 24/3000
Once upon a time when I had no inverter, my charging settings in the MPPT were working flawlessly, as I was using “Adaptive” mode charging and tail current option, set to 8Amps. The charging always kept running until the tail current is reached in Absorption mode and the SG, which I monitor regularly was at perfect levels according to batts’ temperature.
So far so good, but since I installed the Multiplus and cerbo, the charging, governed by the controller when the Multi is OFF (I do and want to keep it off most of the time) had begun to do wierd things, like:
- During Bulk state (no “External control”, but Bulk, i.e. the charger is “in charge”) it behaves normal, reaches the Absorption voltage and goes into Absorption state - fine.
- Absorption state however terminates a few minutes after going into that state when the current is 20A or more, far far away from the set tail current in the MPPT.
I tried removing the tail current option - no change. I set “Fixed time” for the absorption mode and set the time to 6 hours - no change again! The charger goes into Float mode a few minutes after Absorption has started. Even the shunt is telling the batteries are 85 or 90% charged, but the controller doesn’t care - it goes and stays in Float.
What could be the issue with this denial of the controller to stay in Absorption state?
Thank you!
Ivan