VAWT Windmill Calculator

VAWT (Vertical Axis Wind Turbine) Calculator.
http://www.poormanguides.iblogger.org/VAWT.html

Just getting ready for my new book about making your own VAWT from easy to find parts for cheap. It will include grid tie with an AC induction motor, or you can use a DC motor or even a car alternator to charge batteries.

Category:

Science & Technology

Tags:

• VAWT
• wind turbine
• grid tie
• ac induction
• battery
• wind power

[batteryphil]

What would I put in place of motor amps and volts if I am using a 1000w pma?

[rclewis01]

@batteryphil typically, it would be close to 100 volts at 10 amps. But you would have to test to get some numbers. Hopefully, the person or company that made it would know. You can spin it at a known rpm and look at voltage. The amps depend on the gauge of the wire. My 24 volt PMA is rated at 950 rpm, 75 volts at 12 amps if I remember right. Where did you get the PMA? Maybe their website tells.

[batteryphil]

@rclewis01 I got mine from Missouriwindandsolar. It is rated at 75 amps at 2500 rpm at around 120 volts max. I have built my own generator that puts out 50 amps at 2500 rpm and has a cut in speed of 700 rpm, it is regulated to never go over 14.4 and requires no magnets. Both are base on a Delco 10si. But when I type in 50 amps and 14.5 volts it has no output.

[rclewis01]

@batteryphil I would guess that since you make less amps for the same rpm, then your non regulated voltage would be more than 120 volts. One third less amps should mean one third more volts for the same size stator. Also, I assume cooling of the generator from the wind, but the pma has a built in fan, so take 1/2 to 1/3 the amps. So, 160 volts, 20 amps, and 2500 rpms. But I could be wrong :)

[rclewis01]

you mean tip speed ratio? For any drag type it is about 0.8. If the blades have lift, then that number goes up. Just depends on blades.

[electrodacus]

Nice calculator.

I also made a calculator is not as organised as yours is made in open office you can check my video about and you can free download the link is in the description of the video.

Savonius is a bit underrated and there are a lot of wrong data about on the Internet.

[PowerMorse]

Sorry but that calculator is not near 10%. Beginners buy Hugh Piggotts book and where Surface area is needed, for a VAWT is 3.1415 x radius squared x height. Swept wind area is a cylinder. HAWT's height is the thickness of the blades so it can be dropped from the equation for ease of use.

[PhysicsGuerrilla]

The basic formula for wind power

RAW Wind Power =Air Density*Area*Wind Speed cubed. Example =1.04*0.85*16^3

Adjusted Wind Power in kilowatts =Mechanical Efficiency*Electric Efficiency*Betz Efficiency*Blade Area in Square Meters*Air Density in kg per square meter*Velocity in meters per second cubed

Will look like this in Excel or Open Office Calc... kilowatts are =0.5*0.2*0.15*0.9*1.04*9^3

[NZdutchman]

The link to the calculator goes nowhere. Can you update or fix it? I'm keen to try this because I'm just at the early stages of building a helical VAWT

[sjh7132]

I think that third one probably has lift. Check out my CFD simulation of the lenz2.

[pusswhakker]

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