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Solenoid Drains Battery - Why?


SPendrey

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Perhaps I already know the answer to this... but last night I accidentally flicked the switch that powers-up my winch as I got out of the car.  Specifically, a switch that energises the solenoid connecting the winch to the (only) battery.  This morning, I tried starting the car and there's 11V or so measured across the battery and nowhere enough power to turn the engine over.

What I did notice was the solenoid was hot.  Is electrical energy simply lost through heat while the solenoid is energised?  I think there's a magnet or something in there making the contact and I suppose therefore there's an electric coil which is energised and dissipating heat?

 

Lessons learned are "be more careful", and "thank goodness for a spare charged battery!".

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