In reply to carrot_boy (North East Wales MC):
> Hope someone can help me...
> Option 3 - Wire two batteries in Series to give 24v power, linked to heater...job done - but would the batteries produce sufficient power for the start up? If not, with some funky wiring, could I set it up so that the Engine is on for start up, and then the continual running can be done off the batteries?
connect in series when the heater is in use,
and connect in parallel when you need to charge the batteries.
I suppose you could have it set-up in series the whole time and just take it in turns which battery you charge at a time