Alternator charging leisure battery

Just fit a VanBitz Battery Master.  Simples!

Definitely do not run your engine.  It would do very little to help, other than cause damage to your engine and annoyance to others.

Never... why would there be the need?

Only run your engine when you need to move the vehicle, Onepjg.

When you were a caravanner, you would probably have moaned about your neighbour running his MH engine. It is not necessary and will put next door to no charge in your battery.

I think there are two questions wrapped up in one there and probably running the engine is not the answer to either. You need to work out how your system works viz a viz what charges what. Some motorhomes don't charge the cab battery whilst on mains but other do. I was under the impression that my 2019 Bailey did not charge the cab battery whilst on mains but the service engineer at White Arches said that around 2019 they did change the system. You have quite large solar panel so that should keep the leisure battery in good condition depending on load. If the solar panel is connected to the cab battery it usually is only set at 10% with the bulk going to the leisure battery, although the ratio can be changed. As LLM suggested a Battery Master is a fit and forget little device that pushes any excess charge from the leisure battery, however its being charged, through to the cab battery to keep it in good condition. 

David

Thanks DK for such a comprehensive answer. I read on MotorhomeFun someone saying that they ran their MH engine each day for 15 mins to top up vehicle battery. I couldn’t see how that would be effective, so wanted to ask others.

My understanding is that my vehicle battery does not charge when on hook up ( I am going to double check this tomorrow ). The solar panel definitely charges both batteries, but I will see at what percentages.

At least I now know the questions I need answered, and my potential solutions.

Thanks again