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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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  #11  
Old 01-16-2018, 03:36:00 PM
Merv C Merv C is offline
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Default Re: Delco 850 71v 1300 rpm... Why?

Mike,
You are trying to do something that 850 in not intended for, They are designed to have the power drawn from the Batteries. I gather you want to charge another set of batteries at 12 volts to back up the solar system. If you could find a way to convert the 36/38 volts from the 850's batteries to 12 volts to charge the battery bank it will work. However that may be the hard bit, 36 to 12 volt converter may be hard to find You would always have to start it manually but would stop automatically.
Merv
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Old 01-16-2018, 04:05:54 PM
Vanman Vanman is offline
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Default Re: Delco 850 71v 1300 rpm... Why?

"Is the high voltage because I started out with fully charged batteries?" Yes! That'll cook your batteries. *Especially* if they are gel or AGM or the like.

Because there is no throttle and no governor, the generator set is a constant current source. It doesn't care how high the voltage on the battery goes (within limits, of course), it'll just keep cranking out current into the battery. So you must keep an eye on the voltage. Ideally you would have a voltage sensitive relay to shut down the plant or at least sound an alarm.

The series parallel arrangement described to make one large 36 volt battery out of nine 12 volt batteries sounds like a good plan. Switching it back and forth between 12 and 36 volt, on the other hand, would be tedious.

I'd try the Morningstar, just to see what happens. But the battery must be discharged some for it to work.
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Old 01-16-2018, 05:09:08 PM
Mike Cushway Mike Cushway is offline
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Default Re: Delco 850 71v 1300 rpm... Why?

I am afraid I will have to give up on the Delco charging my 12v charge controller/solar array system. I will continue to use the little Kohler 110vdc unit to occasionally top up that system. I also have a nice little military PE-77-D 110vdc/250w unit that I may try out if I can get the bugs worked out of it.

Back to the 36v system. I want to series/parallel the (9) batteries to make a 36v system. I will start looking for a 2500w inverter with 36vdc input. My main intended use is short runs on the 1/2hp lathe and 1/2hp table saw, as well as small power tools. I hope I can use the Delco to charge this bank. I have no issue manually watching over things and actually enjoy that. The fun for me is putting this old iron back to work in my off-grid environment. What I use, I have to be able to fix and troubleshoot. Anyone have any advice on a brand of Inverter or have a used one they would sell cheap?
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Old 01-16-2018, 08:14:57 PM
Vanman Vanman is offline
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Default Re: Delco 850 71v 1300 rpm... Why?

Hmm, a 36 volt inverter probably exists, like for use on a scissor lift or the like, but likely won't be common. 24 and 48 volt of course are very common.

Personally, I'd go with 24 volt. The Delco will be running a bit slower than on 32 volt, but, she's old. She can take it easy.
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Old 01-16-2018, 10:37:21 PM
Mike Cushway Mike Cushway is offline
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Default Re: Delco 850 71v 1300 rpm... Why?

Vanman,
Just when I think I am understanding this you confuse me.....how can I charge a 24v system with the delco? Is not this the same dead end that the 12v was? Plently of 36v inverters online and I like the idea of no charge controller to purchase.
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Old 01-16-2018, 11:17:09 PM
Vanman Vanman is offline
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Default Re: Delco 850 71v 1300 rpm... Why?

Sorry! I'm great at not explaining things to well. Let's try this. While this is an oversimplification, think of it this way-

The amount of current delivered by the generator (amperes) is directly related to how much torque the engine is driving it with.


So, since there is no throttle, the engine will always be developing the same amount of torque (approximately), and therefore the generator will always deliver the same amps.

And

On the other hand, the voltage delivered by the generator is directly related to its speed, which is of course the same as the engine speed.

So, the speed is determined by the voltage of the battery. The set is designed for a 32 volt battery, which may reach as high as 40 volts at the end of the charge cycle (2-1/2 volts per cell). A 24 volt battery would work out to 30 volts.

This works out to 3/4 speed, which I'm sure would be perfectly reasonable.

And in reality, the speed would be a bit more than 3/4 due to the reduced exciting current (from the lower voltage) and the IR drop through the armature, which would be approximately the same for either voltage. Both of these will edge the speed up some.
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Old 01-17-2018, 09:11:31 AM
Mike Cushway Mike Cushway is offline
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Default Re: Delco 850 71v 1300 rpm... Why?

Perfect! The key for me in this last post is the "reduced exciting current". If I am understanding it correctly....less in = less out? You think if I set up a 24v starting battery the Dlelco might run slower?
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Old 01-17-2018, 10:39:46 PM
Vanman Vanman is offline
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Default Re: Delco 850 71v 1300 rpm... Why?

"Less in = less out" There is certainly some truth to that.

At a constant speed, less exciting (or field) current will result in less voltage out (from the armature).

Conversely, at a constant voltage output, less exciting current results in a higher speed.

But yes, considering the effect of all factors, the set would run slower with a 24 volt battery than with 32 or 36. Then you could use all ten of your 12 volt batteries to make a large 24 volt battery.
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Old 01-18-2018, 09:29:02 PM
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Fred Van Hook Fred Van Hook is offline
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Default Re: Delco 850 71v 1300 rpm... Why?

They make voltage reducers for golf carts. 36v to 12v converter
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Old 01-19-2018, 09:13:15 AM
Mike Cushway Mike Cushway is offline
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Default Re: Delco 850 71v 1300 rpm... Why?

Thanks Fred,
I was looking at those the other day.
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