How To Manage Volts And Amps Off Of A DC Generator/Alternator? - Electrical - DIY Chatroom Home Improvement Forum


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Old 08-26-2010, 09:18 PM   #1
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How to manage Volts and amps off of a DC Generator/Alternator?


(This isn't my plan, this is just and EXAMPLE)

If I hook up a car alternator to a bicycle tire, how would i manage the amount of Amps/Volts coming from the generator?

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Old 08-26-2010, 09:21 PM   #2
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How to manage Volts and amps off of a DC Generator/Alternator?


You need something called a regulator. Some car alternators have it built-in, while others have a separate one mounted nearby in the engine compartment.

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Old 08-26-2010, 09:47 PM   #3
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How to manage Volts and amps off of a DC Generator/Alternator?


Thanks for info. Would this also regulate amps? If so what would the amp-age be. And how many RPM's would would be required to say make 12 Volts.
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Old 08-27-2010, 07:27 AM   #4
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How to manage Volts and amps off of a DC Generator/Alternator?


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Thanks for info. Would this also regulate amps? If so what would the amp-age be. And how many RPM's would would be required to say make 12 Volts.
More than you will be able to get from the bike.

Just think of the rpm of a car engine, and compare that to what you would be able to do with a bike.
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Old 08-27-2010, 03:51 PM   #5
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How to manage Volts and amps off of a DC Generator/Alternator?


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Thanks for info. Would this also regulate amps? If so what would the amp-age be. And how many RPM's would would be required to say make 12 Volts.
The load determines the current draw.

To get volts vs. RPM you'd need to measure the volts at reasonable bike speeds, say 15 MPH/22 FPS. The alternator needs to have a reasonable load on it, say a few amps.
Knowing the wheel circumference you can figure wheel speed.

A car alternator puts out almost a HP. A person might be able to put out this much power for a half minute.

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Old 08-27-2010, 08:33 PM   #6
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How to manage Volts and amps off of a DC Generator/Alternator?


The regulator keeps the voltage from exceeding a certain amount. More sophisticated regulators may also boost the voltage if that is too low.

Try to draw too much current and the voltage is going to drop even if the regulator includes a booster. Or the generator may overload and burn out. In the case of a bike generator, the linkage or connection with the tire may start to slip.

The more watts you try to get out of a bike generator, the harder it will be to pedal the bike. This principle is used with electronic exercise bikes to adjust the tension on the pedals and create uphill downhill programs.

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