A Multiplus Compact was charging Victron Lithium Batteries perfectly for 2 years connected to a VE Bus BMS and an Octo GX. Recently the Multiplus looked like it was charging perfectly in Bulk mode but almost no current was passing, (perhaps 3A for a few minutes). A new Multiplus 2 was installed and the behaviour is identical. When the BMS and the Octo GX are disconnected and the Multiplus is programmed to not use a BMS then the charger works perfectly. We suspected the BMS and replaced it but still the same. Also replaced the UTP cables from the BMS to the Multi.
At a loss now as to what can possibly be wrong. Why won’t a Multiplus charge when the BMS is connected but will charge perfectly when it’s not.
