20 foot, Grid Tie PMG, no batteries, maybe found the answer.

[Seyiwmz]

I'm a reader not a poster, but I think I may have found something good.  I helped build my brothers Breezy 5.5   In fact, we're less than a hundred miles from Tom Sullivan and his now decommissioned Breezy.  We had similar low results with ours.  We generated about 1,500 kilowatts for 2010.   I'd love to rip the guts out of it and build my own PMG following the Dan's book that I have.  It would still look a little like the breezy.  There would be no furling.  The blades are so un- aerodynamic and the thing is so stout, it just doesn't tach up to destructive speeds.  We blew a fuse one time that let it free wheel in high winds with hardly an issue.  It's sweet spot could be 120- 150 rpms i believe.  ANd with a constant load, maybe lower.  Right now, it doesn't have the constant load and spins up to 120 then kicks in..... usually for less than 10 seconds because the wind just isn't there to keep it up to speed, and the 2500 watt load draggs it back down.   

Anyways,   check out this product.  I've never heard it talked about here.  http://www.jfy-tech.com/ProductShow.asp?ID=119
It is a grid tied wind inverter that accepts the 3 phase from PMG's, and seems to use a rectifier, they call it a WIND BOX,,, then into the inverter at variable dc voltages I think...   That would be great for us who want to grid-tie without the batteries.  Am I missing something, or is this to cool to be true.  Thanks for reading,,, Guy

[joestue]

it doesn't look like it conforms to the ul1741 standard, so good luck getting your utility to let you use it.

[ghurd]

Other than UL,
It is not Quite big enough for a 17'.
G-

[dlenox]

Have you looked into the Aurora Wind inverter?

Sounds like it is what you are looking for, and our host Rob Beckers is a distributor.

Dan Lenox

[fabricator]

Regarding the no furling situation, the turbine may hold up to unregulated speed, but the stator is a different story, in an unregulated run away situation you will smoke the stator.

[Seyiwmz]

I am wondering if my experience with nondestructive blade speeds, have been experience by others in a "runaway' situation, that have poor aerodynamic blades.  I think the design of the blades keep them from going much faster.  They just stall against the oncoming wind.   The blades are basically 2x12's 10 feet long with a little aerofoil carved in them the whole length of the blade.  I think that plays favor into saving the stator since it has natural tendency to govern the machine down by just having un-aerodynamic blades.  They start up pretty easy though, that's with no load.  I wonder what a axial flux pmg hooked to it would do?

[MattM]

Overspeed conditions burn out coils.  High winds seem to break blades through blade strikes on their tower's pole.  Seems like people confuse the two ideas.  You could reinforce a blade with a metal band running tip to rotor and you wouldn't flex, but that won't protect your coils from overheating.  Likewise you could run a brake to kick in at retain airpeeds, but that doesn't mean the blade won't flex and hit the pole while it slows.

So fabricator is basically telling you furling is better than relying on stall for some not so obvious reasons.

[Seyiwmz]

If i were to convert my induction style genie into PMG I  wonder what sized stator- rotor - coil combo I should go with.  I have an 85 foot tilt tower and  the 20 foot diameter blades, that only spin maybe up to 200 rpm.  They do best at 120 rpm.  I'm just saying it naturally stalls on its own when it goes much faster, so that's what I'm trying to harness energy with.  I don't want to alter the design of the genie other than the guts, aka switching from induction style motor (7.5 hp) and putting in an experimental PMG.  I get 1500 KW a year with the first version, does any body know what they get per yr from a similar sized genie?