Fusing your charge ports is important. Fusing your mains leads is as well, but we’ll argue about that another day
I’d have to presume a large reason a lot of us aren’t/don’t want to fuse our ports (aside from not knowing about it/being a lazy fuck) is because of space constraints. Sure, you can solder directly to the fuse as @b264 does in his The Blue One build - but in the case of needing replacement, that’s a bit of a hassle.
After having found and used what I thought to be the smallest modular fuse holder in my own builds, thanks to @Jansen pulling out some tiny ass blade fuses I’d never seen before, I’ve found something even smaller (and finding the holders for these was actually fairly hard - there ain’t a lot of them made/sold)
So, here our are options.
Mini Blade Fuses/Inline Holders
For space constraints, I modify mine a bit.
Fuses specced from 7.5A-15A (depending on your charger needs) at 58V are perfect - but the 12V ones work just as well
Glass and tube style might not be the best thing for such a heavy vibration environment but that’s really just me guessing. I’d also be worried about it unscrewing, but loctite should fix that even tho it’s plastic.
Soldering an xt-30 to the low-profile minis is a great idea as well, but that gets into being proprietary.
If there’s limited space are there any issues with using an external fuse between the charger and battery? (apart from it being something else to carry with the charger)
You shouldn’t be replacing fuses very often or at all. And if you do need to, you’ll be glad even if it’s difficult because the alternative is much worse
I have only blown out one fuse and it’s because I did something really, really, dumb. Something we’re all bound to do if you ride enough.
Blade fuses not ideal, as they’re usually rated for 12v or 24v (arcing can maintain electrical continuity). I like Littelfuse Pico 2 series, I think the 60v version. They look like chubby resistors.
I woke up sweating at 5A.M. wondering about whether or not the fuse should be placed before or after BMS. Obviously, in picture, I have it on ch- of BMS. I have my theories on what should be done - but @professor_shartsis or somebody else, can you chime in?
I know they have high voltage ratings, but if I understand correctly, voltage ratings for fuses are for arc-breaking, so too high is fine, too low is bad. AC vs DC is very very important (AC self breaks the arc when it crosses zero volts).
