I’m looking for the smallest physical size and simplest to hookup fuses for charging and discharging.
I’ll only charge up to 15 amps and discharge 100 on one vehicle and 200 on the other
This in the pic is simple.
just noting the lacroix “sentinel” board uses a 20A SMD charge fuse.. that’s about as small as you can get. 
but doesn’t meet this requirement.
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this picture didn’t load on first read.
that boards doing the same thing.. but with two fuses and they look to be twice the size of the one on the lacroix sentinel.
@fessyfoo I believe this is a discharge fuse. I like how it’s easy to attach with plugs. My fuses look a mess in comparison. The pcb that attaches the plugs and the fuse is nice.
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IMO, if you’re going to discharge fuse your pack, it should be internal to the battery ideally, or at least before any plugs.
The best place for a fuse is 1/2 way through the pack. Then, if it blows for some reason, you end up with two packs with half the voltage. That matters more if your pack is high voltage, which I’d consider above 14s or so, but it’s a good place to put it in general.
If you do have a fuse for discharge, I’d probably still put another lower current fuse on the charge port. I guess the BMS probably should catch it, but you don’t want to have something getting in your charge port or something blowing the discharge fuse. I’m most worried about something shorting the battery at the discharge XT90, though, so that thing doesn’t help with that. Hell, unless that is fusing the negative, it’s creating a possibility that something goes through that heatshrink and touches the live end of the fuses. Thinking about that things more is making me kind of actively dislike it, TBH.
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