Parallell fusing

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tjobapuerh

New member
Joined
Feb 10, 2021
Messages
19
Hey guys!

i’m setting up a battery pack of 29.4v / 30Amph.
i couldn’t find locally appropriate fuses, and made this parallell set up with 3 fuses of 20A each. Will this work?

cheers!
 

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Korishan

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Jan 7, 2017
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6,518
Yeah, that'd work. Gives the ability to change them if they blow for what ever reason. A little pricey in the end, but works :)
 

tjobapuerh

New member
Joined
Feb 10, 2021
Messages
19
Thanks! and sorry for the late reply I had some computer issues here.
I actually had a chance to test it accidentally, as I was assembling this into the box I managed to short the battery real quick -- there was a powerful spark, but the fuses didn't blow. I guess the BMS took care of it before it had the chance, which left me wondering if this fuse was necessary at all!
(I got a box of some 50+ fuses for 5 euros, so not so expensive in the end.)
 

Wolf

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Sep 25, 2018
Messages
1,561
which left me wondering if this fuse was necessary at all
A BMS is a watchdog device. Making sure the individual parallel strings are reasonably balanced. Some have over/under voltage protection including over amperage protection. Fuses / circuit breakers are your last resort if the proverbial SHTF. So yes they are necessary. You wouldn't run your house without a power distribution panel that includes either fuses or more common now breakers. Cars have fuses and breakers, so does every electrical device that has the potential of causing harm if the current exceeds the safe level.
Wolf
 

daromer

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Oct 8, 2016
Messages
5,659
As said a BMS does not replace a fuse/breaker.
 
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