My 500 watts of solar has produced more than 107kWh in less than 8 months of connected time. Cost - about 4.25/watt. Just for some perspective. Michael...
All things being equal, yes, that is true, however, it is rarely so. (Public) Utility companies have ulterior motives that are usually not to "be practical"......
Except that the terms vawt and efficiency do not belong together. Nick A ... It all sounds good until you click on the "Live data reporting", then "Lifetime"; -...
Was this turbine poorly sited? Do they turn off the switch to skew the numbers? Have they failed to maintain the system? Is the turbine a bad design, or a...
No, vawts just are not worth the effort. Nick A ... numbers? Have they failed to maintain the system? Is the turbine a bad design, or a cutting edge design? ...
I read about Bartmann's 3Kw generator using 13 pounds of magnets per rotor, but the article did not mention if he used ferrite or neodymium magnets. The...
We used neodymiums in our 1000 watt machine. They cost about $250, so I don't see where the $2000 comes from. Steve Spence http://www.green-trust.org [LINK: ...
Although a fair apples-to-apples comparison would have to compare them at the same environment, and at the same swept area, which seldom happens, if ever. If...
http://www.energy.ca.gov/2005publications/CEC-500-2005-084/CEC-500-2005-084.PDF This link shows that good efficiency is available in VAWT's. ... From:...
Their theory was they could inmprove a typical savoniuos by 60%. That;s not good efficiency, that just means it sucks less than it did. Lab results showed a...
disappointed? maybe. a HAWT operates in clean air well above ground level. It's also at least 100% more efficient than a VAWT, so yes, if you put any wind...
It's only up on a 30' pole = poorly sited... Destined to fail, but look impressive in the process of allowing them to spend a great deal of money on a public...
                  Hi prolinusfan and All,                          I've been building, designing windgens for 35...
I used NdFeB, and at current prices, yes you're correct it's quite expensive. The magnets are running right at $50 ea these days so you're looking about about...
Hi. I don't belong to either religion (HAWT vs VAWT). I was simply pointing out that in all fairness, the example that was presented where the utility company...
Yup. Of course $/kWh means accepting all the corruption and shenanigans that lie behind measuring things in terms of dollars and cents, the false systems...
I don't think you have a handle on the facts concerning bird kills, or the self destructing wind turbine ( a commercial unit with a bad gear box). This is a...
Thomas Loeber, Comments @ Jerry about spelling are not called for ...totally irrelevant. Let us know how your tinker toy vertical turbine works out (the one on...
The birds choose where they fly, so too bad for them. If they allegedly fly into a blade, too bad for them. The thing is that no one has demonstrated a useful...
Surely swept area has more to do with power available than with efficiency (unless you are talking materials consumption vs output as Steve pointed out). And...
To do a fair comparison you only need to compare two sets of "energy available in wind at the specific site versus energy collected". All this nonsense about...
That was a critical word Jerry misspelled but that was not my chief criticism of his extreme negating and blanket condemnation with really quite far-out...
Now I have some serious concerns. You ask "Oh, that reminds me of another question that maybe somebody could inform me about. I hear that if you double the...
The amount of energy in an undisturbed flow of wind can be found by the formula: E = 0.5 x (density of air) x Velocity cubed x (Cross-sectional area or swept...
Thom - here's an example in the 10,000hp range: Tractor Tug boats use cycloidal drives called Voith-Shneider drives. They have a really cool mechanism for...
