At present i purchased a changeover switch and have wired it up to the inverter and then to fuse board. The issue i'm having is that when i'm off grid the van is basically trying to charge itself and doing what i believe is called a death loop. I have been looking at current sensing switches but i can't find one with a large enough amperage and connectors for the 12v. I have no way of turning off the transformer/emitter as its being used for everything else as well, and there is no way to isolate the battery charger specifically. Welcome any suggestions , i have attached a photo too show what i mean too, thanks for any suggestions