connecting to dc turbines together to the battery

[super windy]

Hi everyone in this forum, I really need your help with a query I have, I have managed to make 2 wind turbines, one with a treadmill motor, and another one with an ametek 30v, I have donne a few films on youtube.com, here's is one: http://www.youtube.com/watch?v=zm8yRIWonJI , and if you want you can view my other ones in there of both turbines.

now my query since I have the two turbines, which in theory were to charge my 2 battery banks independent, can I connect both turbines together to charge my big battery bank, the reason for this is that I see that from each turbine I can very easily get up to 9 to 10 volts on a daily basis, but obviously you need above 13 volts to start charging the batteries, however my though is since they are both dc, if I connect them together, so maybe the treadmill one is connected to its diode, and the same for the ametek, connect it to its diode, and then connect both outputs together so both would go to the same battery, can this be donne?, or I'm I looking at burning my shed down, or indeed my house, but the way I see it if one is putting out 8 or 9 volts and the other the same, if I join both of them, in theory I should get 17 to 18 volts is this correct?

I view this site on a daily basis and I know that there is somme pretty amazing people here when it commes to electronics and knowledge, well donne, and keep up the good work, I'm gathering all the information and knowledge to do my own hugh piggot wind turbine, hopefully next year, so I might be here on a daily basis bothering you guys with silly questions.

cheers, any help is greatly appreciatted.

keep up the good work

Super Windy

[veewee77]

IF we understand your question correctly, you can connect two turbines together this way, however, if each turning is only producing 8 or 9 volts, they will still only produce 8 or 9 volts but with more amps. Still not enough to charge 12V batteries.

The connection you are talking about is a parallel connection. Both turbines connected together positive to positive  and negative to negative, then to the batteries will add current but keep the voltage the same.

The only way to get more voltage would be to put the turbines in series, negative of turbine one to battery negative, positive of turbine one to negative of turnine two and then the positive of turbine two to battery positive.

However the possibility of this working reliably is nil. Both turbines would have to be turning to get any power at all, and then they still won't produce as much current.

Not a good idea. If you only get 8 or 9 volts from each, you will have to make a voltage doubler circuit to get more voltage at the cost of losses and lower current.

Still not a good idea. Use these turbines as guinea pigs and make new ones that produce better voltage and current.

After viewing the youtube video, it appears that you were getting 18 plus volts from that turbine. It is har to tell from that video how fast the rotor was turning, but that appeared to be making sufficient voltage at whatever speed that was to charge a 12V battery at least some, depending on the current available.

Keep experimenting and have fun!

Doug

[pepa]

search for the post (combining cut in power from multiple turbines). you will find a circut that works, pepa