Hi everyone,
I'm encountering an issue with my 2Q BMS: when the configured end-of-charge voltage is reached, the BMS doesn't lower the voltage accordingly. As a result, my Victron system doesn't switch to float mode. The BMS simply sets the Charge Current Limit (CCL) to 0A.
Has anyone experienced this before or have an idea what might be causing the problem?
@Franz if amps are 0amp, charger should not charge. If charger stop charging voltage will be drop slowly.
If voltage drop slowly, CVL is lowered as well.
I also don't like this behaviour.
In some installation I have problem with this also, with some brand chargers, charger follow only CVL, and charger is not able to follow CCL.
Therefore the system stays to long at higher voltage.
Can you describe, research which chargers keep the voltage high in your case?
It would be nice if REC introduce a setting which behaviour a customer like.
If battery is full, I like that CVL and CCL is lowered directly. It seams now only CCL is lowered and CVL follow a bit later.
Hi Ben,
My setup includes just one charge controller and three MultiPlus-II units, all from Victron. The system is configured in ESS mode with surplus feed-in enabled. I’m guessing that’s why the voltage doesn’t drop. Since for the system to detect a surplus, the voltage has to be higher than the battery voltage.
I’ll double-check that once I reconfigure the system, and see if the voltage drops as expected in that case.
Thanks for the info!
@Franz appreciated if you post an update from your findings.
Hi everyone,
I've been monitoring this behavior and noticed the following:
The BMS only switches to float mode once the set float voltage is reached or drops below that threshold. With a Victron system, however, this never happens because Victron always maintains the charge voltage at the configured CVL—even when the CCL is zero.
To work around this, I built a custom solution in Node-RED that automatically lowers the CVL once the battery reaches 100% state of charge and a defined time period has passed.
