I have a BMV-712 that is used to monitor the state of charge of a 100Ah LiFePO4 battery. I can see it measuring the load (e.g. I have a fridge pulling 65W) and the SoC begins to drop from 100%. However, when the load switches off (e.g. the fridge reaching temperature), the BMV-712 returns to 100% - it does not retain the prior value (i.e. 97%). That is, it is not accumulating at all. There is no active charging of the battery at this time.
Has anyone experienced this? Is there a way to fix it? Without this the product is useless.