Trying to understand whether this is normal or not. As I’ve watched the low-temp charging cutoff from the BMS within my (3) BigBattery lithium batteries engage, I’ve noticed the voltage as reported in the BMS-712 and Cerbo GX drop from 13.2 to 12.6 instantly. SOC stayed the same at around 90% and the small load on the batteries continued uninterrupted.
When this happened, there was nothing charging the batteries as it was the middle of the night so the MPPT 150/70 was off, I wasn’t running the engine with the twin Orions, and the Multiplus 3000 was off. The only thing going on was about a 1.8a load on the 12v system when the (idle) charging side was disconnected. Is this normal? Even if it is, I’d like to better understand why disconnecting the charging circuit at the batteries would cause such a large drop in voltage even when no charging was taking place. Thanks!