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Radzik
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Joined: 09/02/2013
Location: United States
Posts: 2

Posted: 12:52pm 09 Feb 2013

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I am looking to start an at home project and I have obtained a 2hp permanent magnet motor by Boston gear it's pretty old but it does work! It has an rpm of 1750. I think its 180 volt? it says ARM V 180. I have many questions like how fast would it have to spin to produce enough energy to charge batteries? Lots of questions. Do I have to modify it to spin easier? Will it work in low wind situations?

Downwind

Guru

Joined: 09/09/2009
Location: Australia
Posts: 2333

Posted: 02:37pm 09 Feb 2013

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To answer 1 of your many questions.

If you divide the RPM by the volts you will get rpm for 1 volt, then times that rpm by your battery voltage to work out the cutin speed.
For a 12v battery it would be.........

1750 / 180 = 9.72

9.72 x 12 = 116.66 RPM.

So your mill would need to be spinning at around 120 RPM to make enough voltage to start to charge a 12v battery, thats just the point where cutin occures and higher RPM is needed for actual charging.

Pete.

Sometimes it just works

Radzik
Newbie

Joined: 09/02/2013
Location: United States
Posts: 2

Posted: 02:44pm 09 Feb 2013

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Thanks for the advice. Any recommendations? Do's and don'ts before I jump into this project? My ultimate goal is to become energy independent but I don't really know what I'm doing.

Downwind

Guru

Joined: 09/09/2009
Location: Australia
Posts: 2333

Posted: 03:04pm 09 Feb 2013

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Quote Do's and don'ts before I jump into this project? My ultimate goal is to become energy independent but I don't really know what I'm doing.

First step is to learn to use less power/energy to start with, as this mill will never make you independent.

To me the motor is about twice as high in RPM than ideal, but it should work to some extent, and its a starting point.

In most cases you would need wind and solar together to even come close to being energy independent, and in todays market solar works out cheaper than wind, but wind is more fun to build and play with.

Pete.

Sometimes it just works

Madness

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Joined: 08/10/2011
Location: Australia
Posts: 2498

Posted: 03:19pm 09 Feb 2013

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Downwind said

Quote in todays market solar works out cheaper than wind, but wind is more fun to build and play with.

Pete.

Also the wind can blow 24 hours a day at times and quite often when it is raining when solar is not able to do much. On the other hand on a nice calm sunny day wind is not going to help you but solar will be pumping out the watts.

There are only 10 types of people in the world: those who understand binary, and those who don't.

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