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Fideri avatar image
Fideri asked

Fuses on negative terminals?

Hello,

Multiple questions have been asked on this and other forums about fuses and they all conclude that fuses are needed on positive terminals and are redundant on negative terminals though they have no adverse effects. Victron's Wiring Unlimited clearly states on page 32 that "The fuse is placed in the positive cable". So why does this BYD example have a fuse between the negative busbars and the negative battery pole? (https://www.victronenergy.com/live/_media/battery_compatibility:byd-example-diagram-2018-07-21.png)? I notice that other negative points have no fuses.

Fideri


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Alexandra avatar image
Alexandra answered ·
@Fideri


On alot of systems the breaking the negatives means that things that are not galvanically isolated can be damaged so you want a common negative.


A battery usually has a double disconnect this is safer in an ESS system. Even if you check the BYD manual they ask for a double pole disconnect on each battery.

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Fideri avatar image Fideri commented ·
That makes sense.
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