Hi Guys
So ive got a victron bmv712. Running my canopy battery.
Have a bcdc redarc grounded on system grounds along with all loads.
Battery is lifepo4 150ah.
Yesterday i drew 33ah over night and 76% Soc assuming it would take a other 33ah to top back up. Had in sun for about 1hr and SOC was 100%?
How is this the case?
All wiring has been looked at thinking maybe something in settings might fix or voltage on bcdc an issue?
Help.
Thanks guys
The BMV-712 synchronizes and calculates the SOC based on several factors; battery voltage, tail current, Peukert factor and so on. You might need to adjust these parameters. See section 2.2 Synchronizing the BMV in the manual.
I think that you have the sync parameters set too 'relaxed' for a solar setup - so the BMV auto resets to 100% SOC before the time when it is truely recharged to 100%.
Increase the 'charged voltage' setting to ~0.2v to 0.4v under the MPPT 'absorption voltage'. Also decrease the tail current % to ~2.5%, but also make sure that the MPPT settings charge the battery sufficiently to satisfy these thresholds.
The other parameters related to SOC tracking also seem to be incorrect for lithium.
Also take look at these BMV setup videos;
