Adjustable alternator voltage regulator

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Anyone have a circuit for a manually-adjustable, or even automatic regulator
to control a car alternator?
Application is deep-cycle battery charging using 3-5HP small petrol motor.



Re: Adjustable alternator voltage regulator


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How big is the battery? Thinking Amphour capacity.

If this is just a top up system, how about just a current regulator to C/10?

3-5HP seems a lot of grunt for the job.
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Re: Adjustable alternator voltage regulator


----- Original Message -----
Newsgroups: aus.electronics
Sent: Thursday, March 29, 2007 12:31 AM
Subject: Re: Adjustable alternator voltage regulator


My battery banks are 900AH @ 24V (3 strings x 12 batteries x 300AH)
At C/10, I'm looking at 90A @ 24V (nom.) or about 1KVa,  up to 28V for an
equalisation charge occasionally. Allowing for losses in the alternator,
drive belts, etc., of about 30% then I'll need at least 3200W. People who've
done similar things seem to need about double the engine HP. to electrical
power, so 3 to 5 HP seems about right.

This is the sort of thing I want to do, but with an automatically reducing
field current in response to the increasing battery voltage -
www.homepower.com/files/mark8.pdf

Thanks



Re: Adjustable alternator voltage regulator



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Would the standard regulator that is used on a truck be suitable?  It is
basically doing the same thing that you want to do, AFAIK.

Chris

Re: Adjustable alternator voltage regulator


Chris -
Not really, due to need for equalisation charge of up to 30VDC, every so
often, and need to charge solar batteries at a slightly higer voltage than
in vehicles, otherwise batteries take a very long time/never come fully up
to charge.

Thanks for the thought, though

Marcus, in the bush @ Coonabarabran, with an overcast day and rapidly
emptying batteries!
(Will have to go start (240V ) generator......



Re: Adjustable alternator voltage regulator


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Coonabarabran eh? Say hello to my Uncle Max for me ;-)

Chris.

Re: Adjustable alternator voltage regulator


Chris ~
Don't think I know him, actually - sorry!

Amazing how often Coona seems to crop up in films, etc - Spider and Rose,
Stone for instance - many people seem to know it or have rellies/friends
here.



Re: Adjustable alternator voltage regulator


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LOL, thought everybody knew everyone in Coona ;-)

Chris.

Re: Adjustable alternator voltage regulator


----- Original Message -----
Newsgroups: aus.electronics
Sent: Monday, April 02, 2007 1:09 PM
Subject: Re: Adjustable alternator voltage regulator


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Gee, I've only been here about 15 yrs., so I'm not even a local yet, let
alone know eveeyone...............


Marcus



Re: Adjustable alternator voltage regulator



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umm, interim step is if you have the motor and alternator/generator, how
about just building a current regulator to limit the output(battery
input/recharge)? You would have to watch it (that it doesn't
overcharge). Perhaps just run the combo in a couple of hour blocks.

Re: Adjustable alternator voltage regulator


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Yep, that seems right to me.
Not often I seem something as serious as that.
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I am guessing that you are after a 24V version of the electronic
controller. sorry, don't remember seeing one

Re: Adjustable alternator voltage regulator


keyboard and composed:

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Would a current limited constant voltage regulator suffice? If so, I'd
use an LM723 regulator. Connect its error amp to the positive battery
terminal, using a pot and potential divider, and connect the IC's
current limit pins to a 90A shunt, ie 6.7 milliohm (= 600mV/90A). This
shunt resistor should be placed in the positive lead between the
battery and the alternator output. Then connect the IC's output pin to
the alternator's field terminal via a pass transistor.

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.

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