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Tool Talk Discussion Forum

Re: 48v delco alternator?

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sotxbill

06-04-2013 06:20:23
99.42.196.210



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lets see.. a little of my electrical engineering...
take the voltage sense lead of the alternator and hook into a resistor tree on the top of the lowest resistor of 4 equal resistors arcross the output circuit. Make the 4 equal resistors very high in value so leakage current is not a problem. the 4 equal resistors will equal drop the voltage so that the sense lead reads 1/4 of the output voltage. That way the regulator will cut off only when the output is 4 times higher than what is on the sense lead or 48\12. Or 12 * 4 = 48. (really its 14.2 * 4= 56.8volts). or simply order a 48 volt regulator used on railroad and other equipment.

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JMOR

06-04-2013 06:38:03
72.181.173.171



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 Re: 48v delco alternator? in reply to sotxbill, 06-04-2013 06:20:23  
Quoting Removed, click Modern View to seeBill, I have been thinking along those same lines & that is why I asked George whether he had specified which Delco alternator. You are clearly thinking 10SI & your plan may be OK, if the VR's PWM has the range to accommodate the 50 volt input from the diode trio & maintain appropriate field current. If it does not, then it may still work, by removing the trio & feeding the point of trio output with a 12v source (bottom battery). Don't go too high on the 4 resistor tree, as you don't want the nearly one milliamp drain of the #2 (sense) of the VR to alter to divider output. 10 milliamp tree should result in only small error or you can put pencil to paper and calculate error or 'tree' values for your 'error' of choice.

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George Marsh

06-04-2013 10:37:22
205.188.117.17



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 Re: 48v delco alternator? in reply to JMOR, 06-04-2013 06:38:03  
JMOR,
I was think of making a voltage divide to reduce the voltage. Say use a 30 ohm and a 10 ohm resistor. The divider would draw a little over 1 amp and I have power resistors that can handle that.

Problem, if we use a delco with a built in VR, where is the input to the VR? Are the two smaller wires on the alternator the input to the Voltage Reg? The one right goes directly to the +12v and the one on the left goes to the idiot light or to a diode?

So instead of giving the alternator full 12v on the right wire, run it to the voltage divider and give it 1/4 the volts? However the out wire of the alternator will be connected to 48 volts, so the voltage divider will still provide 12v. Do I have it right?

You mention something about watching the ma. Educate me, what are you talking about?

I think you send me a diagram, how to wire up a Massey generator, which by the way, I got working for a friend, Thanks.

Got a diagram of the delco alternator? Don"t really care which delco. Friend will want the one that has the largest amp rating.

Thanks,

George

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buickanddeere

06-05-2013 07:42:18
184.151.63.242



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 Re: 48v delco alternator? in reply to George Marsh, 06-04-2013 10:37:22  
Use a solid state regulator . Off the shelf for a couple of buck and handle 5-20 amps. The voltage divider does not regulate and wastes power into heat.



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JMOR

06-04-2013 12:02:04
72.181.173.171



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 Re: 48v delco alternator? in reply to George Marsh, 06-04-2013 10:37:22  
Quoting Removed, click Modern View to seeNo need to burn that much power with 10 & 30 Ohms, as 1,000 and 3, 000 Ohms will be fine. And that takes into account the ~1ma Sense (#2) drain.

The two spade terminals are #1 excite and #2 Sense. Right & left depends on observer's and alternators positions.

If you do as I suggested in post responding to sotxbill, then there will be no connection to spade #1. That will be covered by the removal of diode trio and the addition of an input to the point of the trios previous output.

Sounds like the plan is wind power. If it is, I see a problem in that if batteries are low, calling for charge AND there is insufficient wind, then the bottom battery is still being drained by the VR's demand for field current & at 3 amps field, it will discharge in less than a day. Assuming 66 A-H battery.

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George Marsh

06-04-2013 13:49:01
50.104.198.127



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 Re: 48v delco alternator? in reply to JMOR, 06-04-2013 12:02:04  
JMOR,
THANK YOU. Actually the plan is not wind power. A friend, who I will not mention, he posts on here too, called me to do this. I had reservations as to if it will even work. He wants to use an engine/delco/4 12 batteries/48 volt dc motor to make a hybrid truck.

He was sure it would work. I saw this guy put a 5 hp briggs on top of an outboard gear drive. The outboard engine went bad. Not really sure if his air cooled outboard worked, but he has to get a red-neck award for trying the unusal.

Thanks Jessie for the diagram.
Let you know if he gets all the parts together and if it works. Looks easy to me with your diagram.
George

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