I have an MPPT 100/50, BMV712, 600W of Solar and 400Ah of batteries. The ‘always on’ draw of the batteries is between 1.6 and 2A. I was on shore power for a few days, where the batteries were kept at 14.2 by the non-Victron charger in my RV. I’m home now, and the RV is in storage, where I usually see 100% recovery by about 11AM, thanks to the Southern California sun, and solar production that keeps the batteries at 99/100% until nightfall.
From the VRM graphs, it looks like the batteries are showing 14.2V, and dropping the MPPT to float mode before the battery SOC hits 100%. Is there something I need to do to recalibrate or reset the system so that it fully charges the batteries? Thanks!
As batteries age the tail current can change a bit and change the way things work. The tail current often increases as they age so you may need to increase the tail current in the SmartShunt.
Assuming you do not have lithium batteries and BMS control, with a a GX device there is a way to make sure float does not start until.after synchronisation. Enable DVCC and n the DVCC menu enable SVS and SCS and choose the SmartShunt as the source so that the solar controller uses the SmartShunt voltage and current for better control accuracy. Then set the solar controller in expert settings to a fixed absorption time of 4 hours and an tail current as the absorption exit criteria and set the exit tail current lower than you use on the SmartShunt. Lets say for example with 400Ah of batteries, the tail current in the shunt is set to 2%, so 2/100*400 = 8A, then set the tail current in the solar controller to 7A.