Check my flag mate. I'm in Oz too.aww5490
It's an interesting thought.
The barttery in question is the engine start battery. This motorhome has a battery charger which when plugged into AC mains power charges up the 'House' and 'Engine' battery(ies).
I am charging up the engine battery now--its 14.4V--but hasn't finished the charge cycle.
Then we will see whether:
i) Flat battery caused transmission/glow plug/air bag problems
ii) Test 'House' batter charger not working
iii) Alternator/wiring issues
I did buy a small solar panel some years ago (about the size of 2 large dinner plates) from. an auto store and organised to put it on the dash and plug it into a cigarette lighter plug direct to the battery but I could never seem to get it to work properly as a backup when I was out bush and nowhere near power and my generator was out of fuel or not working.
I think it's time for less 'playing' and more attention to my systems management!
My MH - Avida - does NOT charge the start battery when the MH is plugged in to 240V power. Might be worth a check on yours. I installed a Ctek low amp charger inside the MH and connected it via a 240V switch inside the MH. Then, when MH connected to 240V, the Ctek charged the start battery. Works well.
Connecting a solar panel via the ciggy lighter would only work if the ciggy lighter wiring was changed to be directly connected to the start battery AT ALL TIMES, not just when ign turned on. Hope that helps.
Ian.