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Forum Index : Windmills : rough guide power figures needed
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| andrewgee Newbie  Joined: 28/11/2010 Location: AustraliaPosts: 4 |
I have a wind gen, operating in very gusty winds in the middle of suburbia. Using a standard F&P washing machine motor, I have seen it peak at 169 Volts, unloaded, in good wind, but most of the time it does 60 ish volts when the wind is gusting. I am just wondering what other people are getting in the way of power, from smallish setups on their shed roof so I can factor roughly how to build the rest of the setup (switchmode converters, fuses, max power expected etc etc). Andrew. 
Andrew G |
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Downwind Guru  Joined: 09/09/2009 Location: AustraliaPosts: 2333 |
What is the stator config rewired to or is it just unmodified. Running an unloaded mill is about as much use in information as how many tits a bull has. Once it is connected to a load the voltage will drop way back, and may not be suitable for switchmodes etc. Nice looking construction by the way (and thats from a bloke that dont like Vawts  )
Pete. Sometimes it just works |
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| andrewgee Newbie Joined: 28/11/2010 Location: AustraliaPosts: 4 |
Thanks Pete, I think I would have preferred a horizontal one with real blades too, but I wanted to stay under the council's permit radar :) so the design criteria was for small and, more importantly silent. To this end, you cant hear it from further away than 25 ft, so from that POV it was a success. But about the expected power (and I'm looking at order or magnitude guestimates here), what other info would be required. It's about 5ft x 4ft (and weighs about 45-50 kg). I can probably log rev's etc. Or do I just make the switch mode up and see if I can blow up some mosfets ? My biggest worry is that most of the electronics I have is rated at 100V max, so seeing 170 odd volts seems bad. Oh yeah, 3 phase star wired. Andrew G |
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| Downwind Guru Joined: 09/09/2009 Location: AustraliaPosts: 2333 |
The important thing is............whats the stator, 60, 80 or 100 series and is the wiring modified or just standard out of the washing machine. Are you intending on rectifing the ac or what do you want to do with it. How are you going to use the power?? Most would put the power into a battery and use an inverter to produce 240 volt. Pete. Sometimes it just works |
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| andrewgee Newbie Joined: 28/11/2010 Location: AustraliaPosts: 4 |
so referencing this from google http://www.uppsndowns.com.au/f&p.htm to figure out what 60/80/100 referred to, I climbed up on the shed roof (and I should point out it's raining in Brisbane at the moment !!) and got my trusty torch and vernier to find out it's a series 80. 42 poles, 14, coils in series. Pretty severe cogging on startup and spindown. I intend to rectify and charge 3 x 12 volt car batteries in series, each phase into it's own rectifer/charger, and connected to one battery to give me 36 volts of output. (if you can tell me if this is a stupid arrangement btw .... :) Andrew. Andrew G |
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| Downwind Guru Joined: 09/09/2009 Location: AustraliaPosts: 2333 |
Hi Andrew, Sorry to hear about your wet ass. 
Im not sure about your idea of seperate chargers per phase and think you are adding a lot of not needed crap to a simple system. Have you had a look at the data on the front pages of the forum here...... http://www.thebackshed.com/windmill/FPRewire.asp With a simple rewire of the stator you could do away with the need for the switchmode chargers and wire it direct to the batteries via a 3 phase rectifier. All that is needed is some form of charge controller/diverson system. Also have a look at decogging the stator on the front page information. You really waste a lot of wind energy and power using an unmodified stator. Being a Vawt you will need to sort out what sort of rpm you have on average to help with what rewire style will suit your needs best. Please be advised a standard stator can reach lethal voltages and should be treated the same as mains voltage, this is often over looked with newbies to wind energy and for some reason think because its a generator it is safe to play with. Pete. Sometimes it just works |
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