We have just bought a rather youthful for us (10 year old) narrowboat, with lots of new fangled equipment that we're not used to, including a Sterling invertor.
We have 4 domestic batteries, all of which are undercharged, currently showing 12 volts on the invertor, less on the panel thing with all the switches. This is after about 10 hours cruising over 2 days. When we visited before purchasing, fridge, webasto etc were all working fine, but things had been left switched on in the months before we actually got on board and now the fridge switches itself off, I assume due to lack of power, and I am unable to chill the wine.
We currently have access to a shoreline, but the invertor keeps switching itself off because it shows that the starter motor battery is overcharged at 16 volts.
We've tried isolating the starter motor battery but it still knew that it was there and switched off again. We've tried starting the engine and switching it off again several times to try to lose some of the charge but it didn't make much difference.
Any ideas how we get it to charge the domestic batteries from the shoreline? When we were cruising, it didn't seem to mind about the starter battery, the invertor stayed switched on and was charging the domestic batteries, we just ran out of time to charge them up fully.
Any suggestions welcome, thank you.