Next message: (no name): "Re: Re(2): lv-ab: Corrosion on battery terminals"
Colin,
As stated in my message, the spike enters the electrical system by arcing
across the opening contacts of the solenoid as they are opening. The main
current is interrupted, but the collapsing field creates enough EMF to arc
across the opening contacts.
I did not suggest absorbing the voltage spike with a capacitor, that thought
was quoted from someone else's message. But it might be a good idea. I have
seen capacitors on sparking devices before to reduce arc generated line
noise. I don't believe your math. For one thing, I have never seen
capacitors described in terms of amperes. For another, the spike would never
be fully absorbed, just reduced significantly. I suppose one could find out
how to calculate the energy involved but just connecting a big capacitor
across the solenoid might be easier.
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