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What type of Diode would I need? Answered

What type of Diode would I need for my little home made Wind Turbine to charge a couple of rechargeable AA and AAA batteries? I assume I would need the Diode for protection against reversal of current, correct?

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mwestonBest Answer (author)2009-09-22

What is the output of the turbine? If it is small, meaning it wont go over 500 mAh or so, then seandogue is correct. Generally most diodes beginning with 1N4... like 1N4001 would be acceptable, you can get these at your local electronics store. Something pushing out more amps may require you to buy something less common on Digikey or another similar site.

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seandogue (author)mweston2009-09-22

Good point. I didn't consider the possibility that his/her turbine was capable of delivering much more than needed for charging the batteries...my bad

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Zem (author)seandogue2009-09-22

His* The Turbine only puts out about 3-4v and less than 500mAH

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seandogue (author)Zem2009-09-22

:-)...I always try to make sure that I know or use the his/her business...no offense intended.. Good. If you can tolerate a 0.6-0.7 Vf drop, a 1N4001 will also do the trick. (pretty much any rectifier diode in fact, as long as it's rated for ~1A or more.) I suggested the schottky to reduce losses.

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Zem (author)seandogue2009-09-22

None taken. Thank you both very much!

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mweston (author)Zem2009-09-23

Well hope it works out for you!

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seandogue (author)2009-09-22

Schottky diode. Like a 1N5817 (20V, Vf=0.45V @1A) or 1N5818 (30V, Vf = 0.5V @1A) would be just fine.

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Rendydevara (author)seandogue2009-10-08

how did u calculate it ? (1N5817 = 20, Vf=0.45V @1A)

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seandogue (author)Rendydevara2009-10-08

I'm not sure what you mean. I didn't "calculate" the diode. I simply selected it. The specifications listed are the mfg specifcations of the diode. I pressumed the required capabilities based on the query and was backed up in my assumption by the author's reply to the effect of "turbine outputs 3-4V @ less than 500mA."

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