Hi. I’m looking for a meter that will measure both the charging current and load current, over time, on my 12v leisure battery. It has a 35ah capacity and displays 12v up to the point it goes flat so. Asimple voltmeter is not enough. I need something clever enough to monitor the load in ah, and see when it is also being charged from the vans main battery as vehicle moves. If you can recommend a product and show me a wiring diagram I would be so very grateful. And I’ll know when my fridge and lights are about to die!!