The solar panel was fitted when I bought the van a couple of years ago and it's worked great. The beginning of this year I noticed the 10amp fuse blowed between the controller and van battery. I have changed the fuse a number of times and it keeps blowing just on this battery. I have narrowed it down to it blows when the engine starts or sometimes when it stops but not otherwise. I have just changed the controller as it was relatively cheap and true to form it worked ok until I started the van, then blew. It is not a large panel so the fuse rating looks correct for that and wire. The wire to the leisure battery has same size fuse and not blowing. I have tried adjusting the charging priority - same result. The voltage is good on both batteries in the 12.4 - 12.7 dependant on temperature, so I happy the panel/alternator is charging correctly.
Any suggestions?
Any suggestions?