Re: Fuse near the battery
"Do I still need the 20 amp fuse on the panel? "
Need, maybe not. But I would. That bigger fuse on the battery will be hard to replace (buy and carry a spare when you order it) and the 20A fuse in your panel should be a 50c part from any auto parts store. I'd rather blow the 50c part and leave the expensive one for "prevents fires".