| T O P I C R E V I E W |
| Victor |
Posted - 28/08/2007 : 20:14:11
I know the dynohub is not the most powerfull of wind turbine Generators,but I now wondering if it is a better idea to make 2 turbines charging individual batteries of 6 Volts.This should allow me to get superb current into the batteries at a lower voltage.
Charging the batteries in a 12 volt system I think the Dynohub is not really up to it unless you use a voltage doubler circuit which adds to the resistance of the circuit and cuts down the Current too....
(Possibly)
I currently have 2 Dynohubs and 2 brand spanking newNovotec ehd-1 Dynohubs.....
I think the Novotechs will give me more power,but they have more of a cogging effect...
My dynohubs turn perfectly you see in a small wind as I have stripped them both down and cleaned them. There is a vast improvement in performance and even i the slightest wind they are turning and giving me a good result in power....
It`s really down to a decision of 1 or 2 things now.
1 - Run 2 novotechs at 12Volts giving superb power output in high winds.
2 - Run the 2 Dynoub Turbines in lower winds on 1 6 volt battery per turbine.
Any ideas into this will be much appretiated.
Regards
Vic.. |
| 15 L A T E S T R E P L I E S (Newest First) |
| Victor |
Posted - 08/09/2007 : 01:51:23
Jesus!! ben id there as many as that? I was tlaking to a guy on ebay the other day who had a Dynohub for sale in America.Thing was it was in the packet and brand new.. lol Not many like that kicking around.....Seemingly he was selling S Archer dynohubs in the state and visited the company on many occasions....His emails were very interesting. HE has given me some nice High Res pics of a brand new Dynohub.
Anyone tried the geared Dynohubs? And do they have more cogging? Do they made a hell of a noise?
|
| gotwind |
Posted - 04/09/2007 : 21:01:49
That is correct Peter, the 12v version was introduced in 1936 and withdrawn two years later according to my 'The sturmey Archer story' book by Tony Hadland - ISBN 9507431 2 7
A good read of a great British company - they don't make 'em like they used to...
It's performance (power) won't be any higher than the 6v version, as the current was rated at 0.23 amps 12x 0.23= 2.76 watts, but it should cut in at 60 rpm, as compared to 120 rpm with the 6 volt units.
The Futures Green - Getwind of it. |
| Peter Williams |
Posted - 04/09/2007 : 20:29:04
I was informed by a vintage cycle parts type chap that there was a 12v dynohub made I think he said around the 1940's. He's gonna try and get me one. What a nice bloke. That would solve alot of problems. |
| Del |
Posted - 02/09/2007 : 23:44:33
Re the Aussie rooftop turbine. All the guy has done is use a VAWT and laid it on it's side so it's now a horizontal VAWT (HVAWT?).
I would imagine that it would be as efficient as a normal VAWT as long as the wind is coming perfectly at at. If it's coming a few degrees either side it will work to a point but lose efficiency quickly and stop altogether if wind hits it from the sides. Innovation is what we all strive for, but if it doesn't improve on an existing design then it's a bit pointless.
I can see his thinking that if the turbine is mounted on the roof ridge then the wind will hit the roof and move over the rooftop like a aerodynamic wind tunnel test on cars etc.
Could possibly be of use in coastal ares where the wind is perhaps more constant in direction.
Cheers
Del. |
| Victor |
Posted - 02/09/2007 : 23:36:29
Hopefully thats the videos working now.
http://www.youtube.com/watch?v=N3jSmYcv6zE
http://www.youtube.com/watch?v=58oAXvL61io |
| Del |
Posted - 02/09/2007 : 23:29:47
Hi Victor,
I can't see your video (the one of your dynohub). I geta youtube message saying "This is a private video. If you have been sent this video, please make sure you accept the sender's friend request".
Cheers
Del.
|
| Victor |
Posted - 02/09/2007 : 23:10:08
Can I suggest this as an idea using two dynohubs at the ends?
http://uk.youtube.com/watch?v=WZ5kX5Yw4eY
Could power not just dynaohubs but any other dynamos on the side of it... This would stop the need for blanaced blades if you have the right location for it?
Comments plase? |
| ll81 |
Posted - 02/09/2007 : 10:54:37
To series two hubs on one shaft will work well. Problem is alignment, both will need to cross over 0v and crest there outputs simultainiously and then wired +-+-. Once aligned they will work fine it's just aligning them.
woo-hoo |
| Victor |
Posted - 02/09/2007 : 06:33:07
I did a quick video of my Dynohub working last night. See what you think of it. I`m very impressed at the speed of the dynohub in this video.Watch the end of the vidoe and dont run away from your monitor!!
http://uk.youtube.com/watch?v=58oAXvL61io
Here is this going fast?? LOL For a dyno? |
| Del |
Posted - 01/09/2007 : 23:29:36
Wow, i didn't realize it was only 60rpm - still thinking about it it wouldn't be much use if you had to get them up to Tour de France speeds to get them to work would it!
This twin VAWT dynohub project could be interesting. I don't think the cogging wil be a prob. VAWT's should be really torquey.
Cheers
Del. |
| fungus |
Posted - 01/09/2007 : 21:26:28
Del; the dynohubs cut in at 6v at only 60rpm, two in series would make 12v, good match for a vawt if cogging can be overcome. |
| Del |
Posted - 01/09/2007 : 21:21:28
Is there an issue of rpm here guys? A VAWT is never going to spin particularly fast, but I'm not sure of the cut in speed of a dynohub. You could consider a voltage doubling circuit but thsat will halve the amp output and as dynohubs are not exactly bulging with amperage output you would only get a tiny trickle charge.
Thoughts?
Cheers
Del. |
| gotwind |
Posted - 01/09/2007 : 19:02:53
Hi Peter.
I have seen those plans a few years ago and made a very poor effort in making a dual dynohub sav vawt.
The cogging doubles up so it needs a good sized diameter and good wind to work.
II81 is correct, both dynohubs need separate bridge rectification.
Use Schottky rectifying diodes - they have a lower forward voltage drop.
Good luck
Ben.
The Futures Green - Getwind of it. |
| ll81 |
Posted - 01/09/2007 : 15:38:06
That will work well. Still give each dyno hub it's own bridge rectifier and parallel the outputs.
woo-hoo |
| Peter Williams |
Posted - 01/09/2007 : 12:43:19
I understand about 1% of this but I have plans that use 2 dynohub, one at the top and one at the bottom of a savonius design. Since these are running exactly at the same speed would this make it possible to be a good 12v charger without power loss |
