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Thread: Peddle power small battery charger from ebike hub

  1. #1
    Member DCorlando's Avatar
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    Default Peddle power small battery charger from ebike hub

    Hi all, picked up an ebike electric bike hub second hand at a swap meet. Wanted it for experiments on making a peddle power small lead acid battery charger. Used a six pack of 10SQ045 schottky 10 amp diodes to convert the 3 phase AC to DC. That's all it took to make the battery charger. The voltage regulation is done by watching a small volt meter and keeping a steady Cadence. A old car headlight was used as a dummy load. From the experiments I have done about 4.5 amps output at 14.5 volts DC is a good hard workout that a fit person can do for 25 minuets or so. The diodes handle it no problem - just slightly warm to the touch. I have gone up to about 6 amps, the diodes are fine but I start to overheat. When using it to charge a battery I found it takes a hard effort at first for 5 minutes or so then the charge starts to taper. It is very quite and works well.

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    Charges the battery used in this lantern radio in about 25 minuets.

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    Super Moderator crashdive123's Avatar
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    Cool project. I liked.....I have gone up to about 6 amps, the diodes are fine but I start to overheat.
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    Member DCorlando's Avatar
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    I think we tend to overlook just how much energy just one residential outlet has. For example 15 amps at 117 volts works out to 1755 watts. Me on the other-hand sweating my but off is having trouble making 6 amps at 14 volts. That works out to 84 watts.

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    Dang, that's 21 times more power then I can make. So it's clear a human powered generator is very limited. Running a TV or microwave is not going to happen; however, a small radio and LED light works well.

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    Administrator Rick's Avatar
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    The point is, you will be able to charge a cell phone or, as you say, a radio to be able to stay in communication if things went bad. It's a great project. Cudos! The used hand powered cranks and car batteries for the radios in WWII and kept the island spotters in communication.

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    oh oh. I could do a treadmill hook up and train Max to run it.

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    Maybe not.

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    Administrator Rick's Avatar
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    No. No, you couldn't. Max is about as far past his running days as we are. My guess is if he could train you to bark when the doorbell rings, he would.

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    Super Moderator crashdive123's Avatar
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    Max might run on a treadmill if you put a monkey at the other end............beyond that..........he ain't running.
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