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Forum Index : Windmills : Ceiling fan power input. help

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redbullalan

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Joined: 17/01/2011
Location: United Kingdom
Posts: 38
Posted: 08:36pm 08 Mar 2011
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Hi all
Looking for some info i have 2 dc mother mills but also built a ceiling fan mill around 50v 1 amp per coil 2 coils
Set them up with a bridge rectifier dc out pit now
What i would like to know can i just connect it up to my battery bank 12v set up.
Or will i heed to hold back the voltage to 13 – 16 volts with some kind of regulator will putting 50 60 volts at low amps into a battery go bang.

i know i will need to connect it to my dump conrtole but what about the exra power

thanks for looking

alan
Reddbull alan
 
VK4AYQ
Guru

Joined: 02/12/2009
Location: Australia
Posts: 2539
Posted: 11:05pm 08 Mar 2011
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Hi Allan

Put a 3 to 1 transformer in before your rectifier to get a better match to the batteries, you could connect direct as the battery will load it down but it will be overloaded and not efficient, a bit like driving your car in top gear all the time.

All the best

Bob
Foolin Around
 
redbullalan

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Joined: 17/01/2011
Location: United Kingdom
Posts: 38
Posted: 06:55am 09 Mar 2011
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Thanks for the info

how would i get hold of one or make one new to this
thank you for your time
Reddbull alan
 
MacGyver

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Joined: 12/05/2009
Location: United States
Posts: 1329
Posted: 05:30am 11 Mar 2011
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rebullalan

Just a quick note here: In order to charge a 12-volt system, your alternator's output will have to be in the range of 14 volts or so. If it goes higher, the system will "clamp" the voltage to 12 volts. However, if your output voltage is very much higher (like you said -- 50 volts), it will heat the coils in your alternator and try to cook it, so you want to not go much beyond about 14 volts, if you can help it.

The rectifier will change the alternating current into direct current and you can likely buy one online for not too much, but what you'll want to consider first off is to decrease the number of windings in your two coils so they produce less voltage. The reduction in windings will give you more space, so you can increase the size of the wire used, which will decrease the coils' resistance and subsequently increase your amperage.

I might add that using two coils is going to thrash around a bit at high speed. It would be better to have enough coils to allow you to utilize what's called "three-phase" windings. These are gathered together in either of two popular methods (called "star" or "delta" by most folks here) before they are connected to the rectifier.

I know that's a lot of stuff, but just take it a step at a time and you'll be fine. There are oodles of posts from lots of people more knowledgeable then I on the 4m; look around.

Oh, and by the way, welcome to the 4m!


. . . . . MacEdited by MacGyver 2011-03-12
Nothing difficult is ever easy!
Perhaps better stated in the words of Morgan Freeman,
"Where there is no struggle, there is no progress!"
Copeville, Texas
 
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