No idea about the fuses. Normally they would be ok sitting there. I suggest you save my post on how to operate it, as the owner's manual is kind of vague IMO.
Meanwhile I never got it clear on whether your 12v system is ok except for the converter. I suppose it must be since that is what you are doing. Hope it all works out for you.
BTW, those LKs (which came out in 2016) were something of an experiment for PowerMax to combine all those features into one converter. Apparently, they were not a big seller because it is so "complicated". Most RVers and other folks want just simple automatic ones they don't have to think about. So you can get them on Amazon from BoatandRV at a low price for what it does, but not featured much elsewhere, even on BoatandRv's own site. The market rules! "The customer is always right."
If you get into battery charging in a big way, you will appreciate what that unit can do. If not, it will still do the job you need it for.
