Hello,
First time poster here, but I've been using the Victron MPPT units for a while.
I recently bought a second hand Multiplus 12/3000/120 unit (230v version) The guy demonstrated it and it seemed to work fine.
I had a sparky cut an extension cord in half and wire 1 tail into the AC in and the other to AC out1. It sat on my test workbench with no load, but powered on. (No battery connected).
During this time I managed to get the firmware updated (to support Victron Connect on my phone). I could view the unit via the MK3 adaptor but not change anything (I think it's a limit of the older firmware/chips). I also hooked a Raspberry Pi running Venus OS onto it using a MK3 adaptor and reporting into VRM - everything seemed to be going well.
After a few days the unit tripped the circuit at home.
Now when I try and switch the unit on the MAINS light flashes (approx 4-5 times) as part of th boot process. As soon as the "Float" light switches on the unit trips the circuit.
Any thoughts or feedback on what the issue could be?
Should I hook at (fused) battery to the unit?