We are using a setup with 2 batteries 12V parallel, total of 210 Ah. It is fed by the alternator of course and via a Multiplus 800/35 when on shore power. On the system is a BMV-702 and it works very, very good when not using shore power. SOC is very accurate etc. But when in the harbour and switching on the Multiplus, SOC keeps decreasing. Load current of the Multiplus is much higher than the users (only a fridge) so it is not possible that batteries get empty.
I’ve checked the battery-settings in the BMV and also the Shunt and everything seems ok. Software BMV is also up to date.
Anyone got an idea?