main switch arcing problem

2 replies [Last post]
slbaker
slbaker's picture
Offline
Joined: 11/22/2007
Points: 61

Whenever I turn on the main power switch (between the battery and the controller)
there is a small short-duration electrical arc created. Since this is probably
reducing the life of the switch, I'd like to prevent or reduce this arcing.

I was thinking of adding a secondary switch (SW2) in parallel with the main switch.
Where SW2 would use a 1k resistor in series to limit the inrush current.
Once SW2 was closed for a second or so then the main switch could be closed without arcing.

Comments? How have other people solved this problem?

BTW, what types of switches are people using for their main power switches?

Thanks,
Scott

Comment viewing options

Select your preferred way to display the comments and click "Save settings" to activate your changes.
reikiman
reikiman's picture
Offline
Joined: 11/19/2006
Points: 8446
Re: main switch arcing problem

Maybe just leave the resistor connected w/o a switch. In the Alltrax installation manual they specify putting what they call a "precharge resistor" across the contactor. Their specified precharge resistor is about 20k ohms and I believe is meant to keep a little bit of electricity in the controller so that when the contactor closes there isn't the sparking. It's the same situation as what you're describing just at a higher power level.

__________________

- David Herron, Green Transportation Examiner, The Long Tail Pipe, davidherron.com, 7gen.com, What is Reiki
- Electrified Electra Townie, 1971 Karmann Ghia (since sold), Kia Soul EV

slbaker
slbaker's picture
Offline
Joined: 11/22/2007
Points: 61
Re: main switch arcing problem

I added a precharge switch with a series 2k. To power on, I first close the
precharge switch and then wait for a second or so and close the main switch.

No more arcing :-)

Comment viewing options

Select your preferred way to display the comments and click "Save settings" to activate your changes.
Taking Charge: The Electric Automobile in America
Website hosting with Dreamhost
The Party's Over: Oil, War and the Fate of Industrial Societies
Internal Combustion: How Corporations and Governments Addicted the World to Oil and Derailed the Alternatives
Electric and Hybrid Cars: A History
Transportation in a Climate-Constrained World



Who's new

  • eurostarautogallery
  • choise
  • PowerDirtBikes
  • millzy555
  • chonda
Customize This