Gruber
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M.L. Toys
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Gruber
HobbyMasters
M.L. Toys
KidsWheels
HobbyMasters M.L. Toys
Gruber
KidsWheels
Anything you want to put here that is "G" rated that doesnt really fit anywhere else
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By YotaTruck
#134681
I've got three permanent magnet DC treadmill motors laying around. These seem to be big with the DIY energy crowd for building wind turbines, but that's not what I want to use them for. I'm wondering how much power I could get out of them when driven by either a 3.5 or 6.5 HP Predator (Harbor Freight) engine. This guy strapped a similar motor to an old (and probably worn out) 3HP lawn edger and with a proper pulley setup is getting 12V/16A:

http://mdpub.com/generator/

Is there any reliable way to predict how many amps I could get out of a motor based on RPM/HP/VDC ratings? For example, I know that if I connected the motor to a 3.5 or 6.5HP engine, I could get 48V simply by fitting the proper pulleys to make sure that the motor is turning at 2240 RPM, but how many amps? What I'm trying to figure out is whether or not I could run a 48V electric outboard drawing 27A via a small DC generator mounted elsewhere in the boat, or at least use the generator to supplement a 48V battery bank so that the boat could run all day.

I've seen "cheater" setups like this before on electric only lakes. Basically what guys do is bring a very small generator with them like the really quiet inverter models people take camping. They run their batteries down and once they're out in the middle of the lake or they beach somewhere for lunch they run the generator top up the batteries or on sophisticated systems, they run the generator while underway so that the motor is pulling power from the generator with the batteries acting as a buffer. The thing is, they're generating AC power from the generator and having to use a power converter to charge the batteries/run the motor. Seems pretty inefficient, and that just generating DC from the get-go would be much better. I'm hoping that some of the electrical wizards here can help me out.
Last edited by YotaTruck on Mon Aug 24, 2015 7:08 am, edited 1 time in total.

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