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Delco and other Low Voltage DC Light Plants Antique Generators, Light Plants, Typically 24, 32 or 48 volt although some are 110 volt. DC Lamps, Motors and appliances.

Delco and other Low Voltage DC Light Plants

Delco 850 71v 1300 rpm... Why?


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  #21  
Old 01-19-2018, 10:22:49 AM
BHoward BHoward is offline
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Default Re: Delco 850 71v 1300 rpm... Why?

Will the engine start on 24 volts?
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  #22  
Old 01-19-2018, 04:07:47 PM
Vanman Vanman is offline
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Default Re: Delco 850 71v 1300 rpm... Why?

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Originally Posted by BHoward View Post
Will the engine start on 24 volts?
A good question! I would bet that it will, so long as it is in good tune.

A possible problem with the 36 to 12 volt converter is the fact that, as the generator tries to increase the 36 volt input, the converter will not increase the voltage (and therefore current) into the battery. Instead it will take less current from the generator since it is now stepping down from a higher voltage.

This is an unstable, runaway condition that will ultimately put too much voltage across the converter input, causing it to shut down, fry, or both.

A 36 (or 32!) to 12 volt fixed ratio converter (if there is such a thing!) would work great though. I have a couple of fixed ratio, bi-directional, 12 - 24 volt buck boost converters. Maybe someone makes them for other voltage ratios as well?

Keith

Last edited by Vanman; 01-19-2018 at 04:22:20 PM.
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Old 01-19-2018, 06:11:49 PM
Mike Cushway Mike Cushway is offline
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Default Re: Delco 850 71v 1300 rpm... Why?

Sorry for the delay. I've been busy trying to do laundry with the '33 Maytag. Switched the 92 out and mounted a model 72 in its place, only to find the transmission bad.

I scrounged (2) 12v car batteries, one good one not so good. Did temp wiring with jumper cables and YES it did start the 850. After getting it running well, I was getting 32v output from the plant. In my excitement to try this out I forgot to take the brush cover off to check the rpm's. I could tell it was running noticeably slower.
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  #24  
Old 01-19-2018, 08:15:24 PM
Vanman Vanman is offline
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Default Re: Delco 850 71v 1300 rpm... Why?

Cool! Sounds like you're on the right track.

And doing laundry in a gas powered '33 Maytag. Awesome! Sounds like the stuff dreams are made of. I LOVE it!
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Old 01-19-2018, 10:56:08 PM
Mike Cushway Mike Cushway is offline
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Default Re: Delco 850 71v 1300 rpm... Why?

What is the high limit for charging a 24v system? I would love to be able to make this work.
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Old 01-20-2018, 01:01:55 AM
Vanman Vanman is offline
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Default Re: Delco 850 71v 1300 rpm... Why?

That will depend upon the type of battery and the temperature.

For "normal" temperature, say 70-ish, and flooded cells, I'd start thinking about shutting it down when it gets to 29-1/2 or so. This from memory.

If you have AGM or gel type, I would consult with the manufacturer and not exceed their recommended maximum voltage for any particular battery temperature. Those are generally not tolerant of over voltage.

Remember that you will have constant current charging from the Delco, so there really isn't a constant voltage absorption stage.

But, as long as the battery is large relative to the generator, the battery should still reach a full charge by the time the voltage reaches the upper acceptable limit.

If it is determined that a longer time at the upper voltage is required, you can incrementally add load to keep the voltage from continuing to climb.
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