Your Questions About Wind Generators Ebay

Steven asks…

how many watts would this use up if going 60 in a electric small car?

so I want to buy this motor…
http://cgi.ebay.com/US-Electrical-40-HP-Motor-1765-RPM-324T-Frame_W0QQitemZ220637052629QQcategoryZ42922QQcmdZViewItem#vi-content

and used it to convert it to an average small electric car, how many watts would it use going 60mph down the road?

admin answers:

Here’s how to figure that out:

Take the reciprocal of your MPG in the small car. Lets say you get 1/30 gallons per mile. Now multiply that by your average speed, lets say 60 mph (it’s usually lower but overestimating is the safe side, leading to more power consumption calculated).

Do that and you get 2 gallons per hour. Now one gallon of gas contains 36.6 kwh of energy, so your using about 73 killo watt hours per hour, which is just 73 kw.

Now factor the efficiency of your internal combustion engine, .22, and you have 16 kw. That’s the power consumption of the car, with wind and rolling resistance, and your drive train.

Divide by the efficiency of your electric drive system, combining batteries, motor, controller and other small losses, which is about .7, and you get 23 kw.

So your average power consumption in that car would be about 23 kw. Now you can easily calculate your run time and your range. If your battery back is 16 kwh, like the chevy volt, you get a 40 mile range at 60 mph, which is what GM engineers claim on electric power alone.

That also shows you how powerful your generator needs to be, if you plan on making a series hybrid.

So these numbers are a good rough starting point.

Ken asks…

Will this be good for a small, homemade electrical generator?

Pure Copper Round Wire Dead Soft 20 Gauge 0.8 mm 16 Feet, it is on ebay

admin answers:

“It won’t work, no matter what” is absolutely correct. You need magnet wire like this:
http://www.ebay.com/itm/24-AWG-Gauge-Magnet-Wire-Natural-100-200C-Enameled-Copper-Coil-Winding-/261075430233?pt=LH_DefaultDomain_0&hash=item3cc94eeb59
or this:
http://www.ebay.com/itm/28-AWG-Gauge-Enameled-Copper-Magnet-Wire-2oz-155C-248ft-Magnetic-Coil-Winding-/251047316335?pt=LH_DefaultDomain_0&hash=item3a73960b6f

Larger gauge numbers mean smaller wire. You will need to wind a lot of turns. The turns will touch each other, so the wire needs to be insulated so the current will go from one end of the coil to the other without taking a short cut from turn to turn. You will need to scrape off a little insulation at each end to connect to the power source

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