Manuell switch, rated 48v used with 96v battery ok?

[odi]

Hi all.
I've found a manual switch rated for the amps i wanna draw. Its a 12-48v marine switch rated to about 400amps.
My question: my battery is 300amps, but its 96volt.

As long as i dont draw more then 300amps will the 48v rating really matters or will it be okay with 96volt?

I will have a resistor across switch, both for avoiding spark, but also for loading up the controller.

 

[harrisonpatm]

Not likely. I've used this type of switch and it will arc across an open connection at 90-120v. Maybe you'd be able to get away with it, but I wouldn't count on it, and I certainly wouldn't expect it to last very long at 96v; the contacts will build up carbon from the arcing, and lead to increased resistance

 

[nicobie]

The contacts will weld shut without a precharge circuit.

 

[odi]

The contacts will weld shut without a precharge circuit.

So with a resistor across for precharge it will be ok?

 

[harrisonpatm]

So with a resistor across for precharge it will be ok?

Not necessarily, because as I mentioned, the gap it creates by opening the contacts is not necessarily enough to prevent arcing at higher than its rated voltage. Depending on specific variables, current may attempt to flow across open contacts, even if there already is a precharge resistor in place.

 

[nicobie]

So with a resistor across for precharge it will be ok?

Yes. Charging The controller up with a 100 Ohm resistor in the precharge circuit will keep the contacts from welding together. This has worked fine on my 96V bike. You just have to remember to use the precharge circuit before switching on the controller. Can't leave the precharge circuit on when riding the bike or the resistor will burn up.