I’ve got a Victron Multiplus 12/1600/70-16 inside my boat. It’s connected to a 12v/280Ah LiFePo4 battery, which has an BT BMS. It has been working in the past, since a few days, it won’t charge.
As AC-in, I’ve tried 2 230v sources: a 3.4 kw Diesel generator, and a (portable) inverter that can provide up to 1kw, connected to a 36v battery pack. Got no access to actual shore power.
Some settings I remember having set (not in my boat atm):
-Weak AC-in.
-Set to Lithium batteries.
-Prioritize other power sources.
-Accepting default/wide range of voltages.
-AC-in limited to 4 amps (for testing purposes only, because of the inverter).
-Power Assist on.
-Obviously, charging on.
-Newest firmware (was on v 5.08) (didn’t reset settings!)
In the main screen, I do see that the Inverter is receiving AC-in power. Hz and voltage are also well within spec. When looking at the details, it says it’s going to switch to the grid, but never does… With just a 230v light 12w light connected, I do see the light flicker when it tries to switch to the grid, and I hear the inverter click. But it instantly goes back to inverter mode. For testing purposes, I also have set the inverter to charger-only. After about 5 minutes, it will say “fault”, but NOTHING ELSE. Totally useless, can’t find/get error codes. Battery is bellow 50% (confirmed trough the Bluetooth BMS/external app), IIRC, 13.15v last time I tried charging. When the inverter/charger is set to turn on (both inverter and charger options enabled), I do get a windmill icon. When I click that icon, I get the option to do bulk charge till 100% full. When I click OK, I get 3 upwards arrows for about half a second/I hear the multiplus click. But it doesn’t start to charge.
It has worked before, nothing has changed in my setup cable-wise.
The inverter side works totally fine, and is easily able to provide constant power to my 900 watts angle grinder. So no poor connections there. Temps in the engine/electrical area are cold, but not freezing.