Lithium batteries discharged and turned off 2 nights simultaneously and the connected Multiplus 12/800 stopped working. I wasn't able to turn it on using remote console so tried with physical switches but no luck.
Tried disconnecting and connecting the battery back - nothing changed.
There are no alarms or notifications - Status 'unknown' on the remote console.
There is no AC input - I live on a canal boat with solar as the main source of power.