We have a Palomino Puma 295KBH that has a fuse right off the battery that goes up into the camper. The 15 amp fuse keeps blowing when I plug it into the truck or into the house. I couldn't even get my...
The problem is that your converter can supply 30 or 40 amps of current to a dead battery which is enough to blow the fuse you have installed. A fuse doesn't care which way the current is moving it will blow anytime the current rating is exceeded. I would suggest using a good battery charger to see if you can charge the battery. At the voltage you stated it is really dead.