| Author |
 Topic  |
|
|
MattieG
Starting Member
United Kingdom
8 Posts |
 Posted - 12/05/2008 : 18:27:57
|
i
I still havent hooked m turbine up yes as im not particularly getting enough volts out the 38v motor bu was just wonderring if anyone is using an MPPT controller to squeeze the potential 500W out of the Ametek 38v?
Im having a crazy idea of bbuying 3 or 4 of these motors and connecting them together with one off them holding the blades and the other 2-3 o them being run of a pulley or chain but conntected in series.
This wold give me enough volts to charge but when it was 'windy' I wold be getting lots of voltage and could benefit from an MPPT controller? any advice appreciated. These 38v motors are easy to spin up and there is a guy on eBay selling one with a 1:3 gearbox on but why not get 3 or 4 motors wire to in parallel and 2 in series.
I think ill try it for a laugh whhen I get my other motors ordered.
If anyone is interested in ordering 10 or 20 motors from the US let me know we might get a a good deal )
Mattie - Now Addicted to wind!!
Mattie
|
|
|
ghurd
Junior Member
USA
309 Posts |
Posted - 13/05/2008 : 00:03:09
|
The idea is called "Overunity". Or getting something from nothing.
Please don't waste money and time on it.
People have been attemping it for a hundred years. Maybe a thousand years.
Maybe check Betz Limit for a reality check.
MPPT is best suited to solar. That's why solar controllers sometimes use it.
It CAN work very well with high voltage solar.
G-
|
 |
|
|
Gill
Starting Member
Australia
42 Posts |
Posted - 13/05/2008 : 11:52:26
|
For something you may be able to build yourself, why not try a switch setup for say 2 generators?
Have the 2 in series for higher voltage giving early cut-in and some charging in light wind, then switch to parallel for higher current when the wind picks up? If you have some basic electronic skills you could use say a control circuit and relay to do the switching automatically. No where near MPPT technology but better than two individual generators and a great experimental basis for that wind farm you appear to be building.
Cheers... Gill |
|
|
|
MattieG
Starting Member
United Kingdom
8 Posts |
Posted - 13/05/2008 : 22:19:36
|
Cool
Sounds a good idea. Ive just ordered a few motors so Ill give it a try and post my results ASAP.
Thanks
Mattie
Mattie |
|
|
|
ghurd
Junior Member
USA
309 Posts |
Posted - 14/05/2008 : 19:34:22
|
The double resistance will kill the output.
Most Basic? Wasted watts = amps X amps X ohms.
If the amps = 1, and the ohms of each motor is 1, then wated watts = 2W. Not a big deal.
If the amps go up to 3A, wasted watts is 18W.
With 5A, wated watts is 50W, meaning about half the power being made is lost.
The wasted watts come from the blades, or wind.
5X the usable power means 25X the wasted power.
When the wind is below 6MPH, there is no power to be had, even if they are in series.
But there is power at 8MPH, and the double resistance keeps the output super low when it should be a lot higher.
If the blade design matches the generator, things will be a Lot better.
Yes, there are exceptions. I have a couple motors that make over 1A (3A IIRC) at 6V, but will never (with wind) hit 12V. Those would only work in series, but they are not worth the time, effort and money to make 2 windmills. A single windmill with a better motor would work far better, with less effort and money.
What motors did you order? 38V Ameteks?
G- |
|
|
|
Gill
Starting Member
Australia
42 Posts |
Posted - 15/05/2008 : 15:00:41
|
Mattie,
Good to see you're giving it a go. What is one mans trash or wasted effort, may well be another's treasure. Have fun.
Cheers... Gill |
|
|
| |
Topic |
|
Anyone using an MPPT controller?
