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I went further and started searching for a good candidate for the motor. There is a bunch of electric scooter motors on Ebay selling for less that $10 each. For example:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=75210&item=7157958719&rd=1
These are 24V and rated for 2500 RPM. The voltage is wrong and the speed rating is a little low. There are some rated at 2750RPM, but I'd like to see 3000. 16A is plenty for a backup generator.
Bill, what do you think? Could you suggest a better candidate motor.
I would stay away from the inexpensive brush motors. They really don't last unless they are high-quality. You want the back-up to work when you need it.
Small brushless DC motor/generators are out there, typically in scooters. They are typically set up for 24 volt input power, but I suspect they would happily put out 12 volts with modification to the controller (or complete substitution of the controller for a simple regulator.)
Here is an example:
http://store.nycewheels.com/go-motorboard-transporter-1500-electric-scooter.html
You can likely buy the motors for some fraction of the cost of the scooter.
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