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vidaliaman
Member
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# Posted: 4 Feb 2016 02:05pm
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help from all the electrical experts...
just got my hands on a treadmill motor, electrical rating at 130vdc 2.5hp
also says 6700 rpm 18amps
what rpms would i need to run at to use this to charge batteries?
thanks dave
michigan
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rockmtn
Member
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# Posted: 4 Feb 2016 02:14pm
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Are you trying to build a micro-hydro set up with this motor?
To answer your question we would need to know the voltage of your battery bank (if its 12 V you will likely need a Charge Controller to step down the voltage).
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Jebediah
Member
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# Posted: 4 Feb 2016 02:27pm
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No expert but I'm sure I seen this set up on utube.
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groingo
Member
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# Posted: 4 Feb 2016 03:44pm
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First, you would simply do best by using a Geo Metro alternator, they make loads of power at much lower r.p.m.s and require much less torque to do it....this is the most common power supply used for small hydro projects.
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vidaliaman
Member
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# Posted: 4 Feb 2016 03:52pm
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let's hypothetically say 4 12v batteries, also what will i need between the motor and the batteries?
sorry about the newby questions, just revisiting this issue from a year ago on this site
where can you pick up a geo metro alternator?
dave
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rockmtn
Member
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# Posted: 4 Feb 2016 05:21pm
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4 12 V batteries in parallel or series?
This: http://www.hipowerhydro.com is a very decent hydro set up that includes a motor, runner, and housing. It can be configured for 12V (direct couple to a battery, easy) , 24V , 48 V, or 120 V transmission. Ultimately, to get a reliable and useful machine your going to need to make an investment of this level. If you just want to have fun and build something that spins with water and makes a few electrons then an old car alternator + home made runner will be a great project!
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vidaliaman
Member
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# Posted: 4 Feb 2016 06:30pm
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thanks rockmtn, going to check them out to see if what they works for me
dave
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rockmtn
Member
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# Posted: 4 Feb 2016 08:53pm
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Cool-- you might check these guys out too: http://www.powerspout.com
Good luck!
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kittysmitty
Member
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# Posted: 5 Feb 2016 04:14pm
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Simple math to figure out the RPM's required
6700 rpm divided by 130 volts dc = 51.538.. rpm per volt.
so for a 12 volt battery you want to put out around 14 vdc
51.538 times 14 volts= 721.5 rpm
for a 24 volt system, double the rpm
That's the answer to your question
"what rpms would i need to run at to use this to charge batteries?"
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