Re: 6 volt starter with 12 volt system

Posted by Doug in OR on January 17, 2005 at 11:28:39 from (24.20.250.197):

In Reply to: Re: 6 volt starter with 12 volt system posted by lee on January 17, 2005 at 10:19:49:

It isn't quite so simple, Lee. First of all, as a motor spins faster, it develops more 'back EMF'. This causes a motor to draw fewer amps. You have to take this into account when you calculate ohms law. Things aren't constant. And bear in mind when you consider power loads - which is what heating is all about - that you have heatsink capabilities with the mass of the windings and starter frame. The bottom line is that the starter will not develop twice the power and heat just because you apply twice the voltage.

A good rule of thumb, as posted in Bob M's page, I believe, is to not spin the starter for more than 15 seconds between two minute rests. I've never had a problem starting my tractor within that first 15 second time frame after converting to 12 volts.

Follow Ups:

• Re: 6 volt starter with 12 volt system lee 12:02:38 01/17/05 (0)

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