150/60 controller
I have absorption trigger voltage set to 56.0 volts. It usually switches into absorption at around 56.12-56.18
I’ve had three OVP events in the last 10 days and looking at my Victron history on all of those days the high voltage was around 56.35.
I thought I remembered reading somewhere that the charge controller will wait for 1 minute after the absorption voltage is reached before switching from both to absorption OR if a threshold above the absorption voltage is reached that will also trigger switching.
Does anyone know why the controller would not be switching to absorption at the normal voltage (56.15ish)?
Margin of error. Possibly .
Check if your connections are still ok though.
But in normal operation it has to raise the voltage potential above target. If you battery is tripping, possibly it is balancing too slowly. So OVP on one (or two cells) is being triggered in the battery, not a pack voltage problem
You can lower the voltage by 0.2v and then see from there.
You would also see voltage overshoot when the battery disconnects itself.
Thanks . Yes hopefully I can be home sometime soon to actually observe these events. Definitely one of the challenges of off-grid! And trying to live a working life.
Do you know where I could read about the Victron algorithm and how the charge controller decides when to go into absorption? Is it a factor of how quickly the overall voltage is rising?
Yes I am having issues with one cell - high voltage out of balance
No algorithm is explained. Just a charge curve.
It switches to absorption once the target voltage is met after a certain period of time from what i can see in the charts.
What is the c rating for charging on your battery? Is it possible you are exceeding the nominal charge amos recommended?