Quote:
Originally Posted by Fast Eddy
You need to know how much current the relay is pulling. I=current. Then you want to drop V=1.4 volts. V=I*R and R=V/I. I'd guess it's probably around .25 amps, so you'd need about 6 ohms. The resistor needs to be rated for the power too. This is P=IV or about 3 watts.
Test, measure and adjust. You could get a rated potentiometer and just dial it down until you hear the relay click. I've got a variable power supply if you want to meet up over beers. My multimeter is currently on 'missing' status though.
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I'll take you up on that! Biggest issue for me is trying to find a proper 11 volt system. Although, It may have to be after the new years, as I have too many projects on my plate to spend a day doing something like this.
What I am trying to do is to make my ARB Fridge kick off when the voltage in the battery hits 10.5 or 11 volts. This way I don't drain my 2nd battery to 1 volt, thus killing an odyssey battery.
Engel makes one of these controllers, Engel makes a controller like I describe, although I was told how to make one for $10 that was very effective.