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Thread: Wind generator?
i just bought a set of Reelight sl120's
they are pretty nice lights that work without batteries, and make very little resistance.
so i was looking on ebay for magnet generators and found this small wind generator...it should have very little resistance and provides a voltage output at 620 rpm was 12.31 VDC, 22.22VDC at 1100 rpm, 35.6 vdc at 1720 rpm and 48.5 vdc at 3100 rpm.
has anyone tried changing a dyno for one these?
is like and alternator i would think..
heres a link to ebay: http://cgi.ebay.com/Wind-generator-t...3A1%7C294%3A50
03-05-2009 #2Senior Member
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Interesting. Hook one up to serve as an electric starter for an engine, and let it run as a generator once the engine is running. Plenty of power for a set of lights."People are the only mirror we have to see ourselves in. The domain of all meaning. All virtue, all evil, are contained only in people. There is none in the universe at large." - Cordelia Naismith
03-05-2009 #3MBc Member
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A clever fellow up in AK came up with this using a similar generator to run his electric hub motor. If you could get the get the shaft to turn parasitically off the engine and get the rpm's right or rectify it somehow no doubt you could charge a battery or run lights direct. In fact you could probably run a microwave off one slightly bigger with an inverter."The future is already here, it is just not evenly distributed"
03-05-2009 #4skyl4rk Guest
It will produce plenty of power for lights, the issue will be that it is DC, and the voltage depends on the rpm. If you are charging batteries, the changing voltage will be a problem that can be solved but not simply or easily.
Here is a build using a slightly smaller permanent magnet motor.
03-05-2009 #5duivendyk Guest
To charge a 12 V battery would take something like 1200/1500 rpm ,might be good for up to 5Amp.could be used on HT engines with internal reduction of 4 to 1. A buckpuck constant output current regulator could be used to run LED's or charge a battery (battery voltage does not matter). Look up www.ledsupply.com
You sure about the buckpuck for the battery? Since it's a constant current source, as the battery 'resistance' increases as it becomes fully charged, the output voltage would increase until it exceeds the gassing voltage of a lead-acid battery, I believe.Lou
"Lisa, in this house, we obey the laws of thermodynamics!" - Homer Simpson
"Bicycling is a healthy and manly pursuit with much to recommend it, and, unlike other foolish crazes, it has not died out." -- The Daily Telegraph (1877)
03-06-2009 #7duivendyk Guest
You are quite correct in that regard, some other means needs to be provided to either limit the battery voltage or to provide an indication that the battery is being overcharged.The buckpuck by itself is not a complete solution.It has the advantage that it can handle widely varying input voltages,up to 36V I believe.It is my understanding that standard battery charging IC's are intended to operate from constant inputs,but I may be misinformed in that regard.The buck puck is nice that it is a constant, (but controllable) current source tailored to powering LED's which need this.If this generator does what it is claimed to do in terms of output current,7.5 Amps seems rather a lot for such a small unit, a battery would not really be necessary.Even a couple of amps would be adequate.Some coupling to mechanically disengage the generator might be useful,but there is nothing wrong with running with your lights on all the time,unless of course stealth is imperative.It appears to have ball bearings, so brush life would be the limiting factor.
Last edited by duivendyk; 03-06-2009 at 07:37 AM. Reason: addition
I think that that generator will work for me. I am going to try it out at least. Just going to have to figure out a mounting bracket to put it above the SBP shift kit
I have a solar voltage regulator that will work with this. (harbor freight, has the kit on sale again for $179, again) I also have an DC-AC converter that I can add in.
Worst case I build a windmill. LOL
03-06-2009 #9duivendyk Guest
A pretty high rpm windmill at that, or else not much output.$179 is pretty steep for a regulator.You could get one for a third of that.What you would do with DC-AC convertor on a bicycle escapes me.I am sceptical of 7.5 Amp output,just the max current,but probably only 3 amps or so continuous.It's probably pretty durable if you don't overload it.
Last edited by duivendyk; 03-06-2009 at 09:33 AM. Reason: addition.
The "power center" has a place to connect the DC generator, instead of panels, 7 output jacks. So I just need to add a battery pack somewhere. I know that I can charge my nite rider light on the USB port, did it already on the kit that I have running The 12V lights would be fun if you need a little lighting while camping, just fire up the bike
DC-AC is so I can plug in my expresso maker, web camera, small electric appliances, etc. LOL.
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