Re: more of a electromechanical question
From: AC/DCdude17 (dude17_at_sacREMOVE_THISbeemail.com)
Date: 07/30/04
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Date: Fri, 30 Jul 2004 14:41:37 -0700
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Neil wrote:
> I am trying to get a small gas powered engine running, (Rockwell) and I need
> some help electrically. I have the unit running on the bench, with a simple
> on/off switch, and a 12 volt marine battery.
> I can get it started absolutely ok, but what I'm wondering, is it possible
> to have the starter motor charging the battery while its running, so it can
> power lights, just like a car does?.
> If I can do it, is it simply a matter of using a relay, that will take the
> electrical power generated from the the starter, once the engine is running.
> In other words a relay that will switch between running (starting the
> motor), and generating (running from the motor).
> Do I need to place a voltage regulator between the starter and the battery?.
> What do I need to keep the battery from overcharging?
> Thanks
> Kim
The hybrid alternator/starter assembly used on marine engines isn't
regulated well at all. The voltage can go up as much as 16V and this is
bad for the battery.
Use a small automotive alternator. They have a regulator installed
already and it will maintain steady 13.8V to 14V even with varying RPM.
You can tweak the pulley size to change the maximum output.
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