Re: [electricboats] Battery Fusing

On 28/5/21 2:56 pm, Kai wrote:
>
> This is largely an issue for Lithium chemistries, I don't believe that
> (most?) LA batteries are physically capable of generating the very
> intense short circuit currents which is necessary to overcome the
> interrupting capacity.
>
>
A Lead Acid battery bank can source some pretty fearsome fault currents
too. Just less likely to have the battery back burst into flames and
start and unstoppable fire, but overheated wiring is not friendly.

I have a 250amp fuse bolted directly to the positive battery terminal.
My motor is rated at 110amps short term and I set the controller current
limit at 60.

The fuse will only ever blow if a wire comes adrift and shorts or the
switching transistors in the controller have a catastrophic short
failure. And I suspect the transistor casing would blow and extinguish
the arc before the fuse blew anyway.

Even ignoring the battery, the wires to the battery could start a decent
fire on their own if there was short circuit current from my lead-acid
pack for any length of time.

In my city several months ago, a route bus caught on fire in service. No
injuries, every one baled out in good time, but the vehicle is a write
off. The fire started when the 'jump start' wiring to the jump start
socket shorted against some part of the body. There was no fuse at the
battery end on the jump start wiring between the battery and the socket
on the outside of the vehicle, so it's presumed the battery just dumped
all it's power into the wiring and something caught fire.











-=-=-=-=-=-=-=-=-=-=-=-
Groups.io Links: You receive all messages sent to this group.
View/Reply Online (#31481): https://groups.io/g/electricboats/message/31481
Mute This Topic: https://groups.io/mt/83130177/3360820
Group Owner: electricboats+owner@groups.io
Unsubscribe: https://groups.io/g/electricboats/leave/6293187/3360820/430022002/xyzzy [newarmyguitar24@gmail.com]
-=-=-=-=-=-=-=-=-=-=-=-