Universal motor in wind generator

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nlc
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by nlc » 25/08/09, 14:00

If your wind turbine supplies 24V and you recharge a 12V battery through a voltage regulator (something with a heat sink !!), that means that 50% of the energy you draw from the wind turbine goes into smoke and does not go into the battery!

You should find a small mppt converter not too expensive, it would save you time .... and therefore money (as you did for the generator) !!
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by darwenn » 25/08/09, 19:31

Yes, but hey already with the purchase of the generator ..... if in the meantime I can do otherwise I would like it as much.

In the second case of parallel loads, we consider despite the losses that it can work (with I suppose anti-return diodes so that a battery in parallel does not go to discharge in the other)

In the first case I explained, what happens if I charge two 12v batteries in series from wind turbine 24, but only use one at a time for the inverter. Will the serial charge work for two batteries, one of which is more discharged than the other? will it work or not ?. Because there either I buy a mppt or a 24v inverter but in both cases it makes me incote to spend a lot and I would like to avoid for the moment.
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by darwenn » 25/08/09, 19:48

Well, I found the answer to the first case and it's no, it means that to be charged in series, the two 12v batteries have the same individual charge level.

Misery even now I am still stuck, finally I should have chosen a 12v generator it would have been easier :| and it will be cheaper for me. I still have the possibility to charge in parallel with two 12v regulators or to use a 24v -> 12V inverter but hello the loss of power I imagine.
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by nlc » 25/08/09, 19:53

Couldn't your inverter work on 24V input?
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by darwenn » 25/08/09, 19:56

And no unfortunately, I just looked at the doc.
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by darwenn » 25/08/09, 20:07

Or as I said, I charge my batteries in series, therefore 24 volts and I put a DC / DC converter 24> 12V on which I plug my inverter. A 24v 12v 20A step-down device costs 40 euros in the shop near my home. Would this be a good solution without losing too much power in the meantime?
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by loop » 25/08/09, 22:19

Bonsoir

To respond to nlc:

yes the mppt regulator is a Buck model

For Darwenn

There is no problem to use your alternator on 12V batteries
In reality, the voltage shown for a permanent magnet alternator only means that the range of rotational speed and power curve is optimal for 24V output.
On the other hand, the maximum power in 24V of 1000W means that the maximum output intensity will be 50A.
These 50A are also the limit in 12V use, and the stator being wound with thinner wire, you start to produce earlier, but the resistance of the winding being more important, the output is less good in the end.
Test like this first.
The day you leave 50A, you call me and I come to take pictures, or I land with my regulator (if it works correctly by then) : Cheesy:

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by darwenn » 26/08/09, 02:54

You mean I can charge a 12v battery with a 24v wind turbine? : Shock:
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by loop » 26/08/09, 12:30

Hello

recharge a 12v battery with a 24v wind turbine


Of course it is possible.
It is not the wind turbine which is in 24 V but the alternator.
In addition you do not use a 24V voltage regulator.
If the alternator gives a rectified voltage of 28V at 240 rpm, it will output 14V at 120 rpm, which can be useful to start charging the batteries early enough.
The disadvantage is that the resistance of the winding being higher than for a 12V alternator, the formula U = E-RI is unfavorable to efficiency.
It is likely that the alternator heats up more and requires more power from the propeller to deliver amps as soon as one goes up in the turns.
The battery will always stabilize the output voltage of the rectifier bridge at approximately 14V. The limit is the maximum intensity that the battery can absorb.
A car battery can do the trick for testing, because it can handle heavy loads well (large plate exchange surface to be able to output the amps required for the starter)

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by darwenn » 26/08/09, 13:21

Ok, but if in a stronger wind the alternator voltage suddenly rises to 24v ... I have my regulator but if I hold it for a weak wind alternator voltage (120tr / minute) to have 14 volts in output, the output voltage is not perfectly stable, I risk having +16 or 17 volts if the alternator delivers 24. This is the concern of my regulator, well I did not do much testing to be sure and not yet on a voltage of 24v. Well, anyway I'll see when I have the alternator by doing some load and no-load training tests.
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