Brand new Victron Multi plus Charger/Inverter 16A . When +12v cable applied "Low voltage lt " comes on and stays on irrespective of programming. Battery voltage : 12.5 v. The unit does not charge and when Inverter is selected it does not invert . Depowering and reprogramming dip switches has been tried several times . Some "clicking" can be heard in the unit when main switch is changed over- Off-Inverter- Charging .