Axial flux and the Classic

[Volvo Farmer]

Okay, I ordered a 250 today. If I can't use it for wind, I'm going to re-wire my panels from 48 to 96V nominal into a 24V bank. My Voc should be around 220V at -15F so I should be safe.

Anyway, I have a Otherpower designed 10 footer, with the large round magnets and the 24V stator with #15 wire. I've been reading the forum here trying to get my head around what I would need to do to use the Classic for my wind turbine.  I'm just dumping with a C60 into wire wound air resistors at the moment. I have a MX60 for solar and just set the C60 diversion up around 30V to avoid any conflicts.

So is there anywhere I can go and read for the next 8-12 weeks until I get my hands on one of these? Three questions come to mind.

Should I consider a different stator, wired for higher voltage than what I currently have?
Do I need to build one of those home-made clipper things for this turbine?
Do I leave the C60 connected, or do I use the Classics Aux for the new diversion controller?

Thanks for any help. I feel kind of bad asking to be spoon fed here, but I don't see a lot of information on using these types of turbines with a Classic yet.

Cheers!

[Halfcrazy]

Welcome Volvo Farmer

I have been running a 10ft other power style with the 1 by 2 magnets here for 2 years into a Classic 150. I will try to answer your questions the best I can. First the stator voltage does not need to be higher it is nice to have it say 5-10 volts more so the Classic can have say 6-7 volts of differential between battery voltage and Input voltage. The one advantage to higher voltage would be smaller wire size from the turbine.

You really should have a simple over voltage device (IE Clipper) simply because there may be times the battery get full or what not and you will not want thew turbine running unloaded.

You can leave the c60 in place if it is all there and working or you could use a solid state relay driven off the Classics Aux output the choice would be entirely yours. The Classic will be more sophisticated in its offerings for diversion control for sure.

One thing to think about here is voltage versus current I would say my 10ft machine was very happy running up to 2000 watts without much problem so this will equate to a bit of current for you on a 24 volt system. Ideally I would pick a Classic 150 for your application with a 24 volt battery and a 24ish volt stator as the VOC of that turbine will likely be around 140 volts and the additional current capability will be needed for that turbine on a 24 volt battery.

What you will see with a 250 volt Classic will be a lot of time spent on the current limiter and this will allow the turbine to run fairly unloaded in the higher winds. The Classic 250 will run up to 62 amps on a 24 volt battery or about 1800 watts. The turbine will not spend a lot of time above that but it will on occasion. The one thing you can do is flatten the power curve out on the higher end to drive the turbine into a bit of a stall. The turbine will than furl out of the wind and regulate pretty darn well. This type of turbine is very easy to manipulate with the power curve they have such a strong alternator.

[boB]

So is there anywhere I can go and read for the next 8-12 weeks until I get my hands on one of these? Three questions come to mind.
Cheers!

Read ! ?? !!

You can come here and we'll put you to work on the production line and you'll know more about our product
than you'd ever find by reading anything !!

Of course we may not be able to pay you, but it might be fun and educational !!

boB

[Halfcrazy]

So is there anywhere I can go and read for the next 8-12 weeks until I get my hands on one of these? Three questions come to mind.
Cheers!

Read ! ?? !!

You can come here and we'll put you to work on the production line and you'll know more about our product
than you'd ever find by reading anything !!


boB

Ok I am envisioning a big buffet here. Come build your own Classic just how you want it.

[boB]

So is there anywhere I can go and read for the next 8-12 weeks until I get my hands on one of these? Three questions come to mind.
Cheers!

Read ! ?? !!

You can come here and we'll put you to work on the production line and you'll know more about our product
than you'd ever find by reading anything !!


boB

Ok I am envisioning a big buffet here. Come build your own Classic just how you want it.

Hold the relays, hold the MOS FETs, special orders don't upset us !

Have it your way  at  Controller King !

[Volvo Farmer]

Hehe, if I didn't have family obligations, I'd be up there in a heartbeat populating boards for you folks. Who needs money anyway?

Thanks for the information.  So the 150 would be preferable to the 250 for this wind turbine.  I am strongly considering just ordering a second unit, rather than trying to change my order.

Without getting too off-topic, I have (eight) BP  SX170Bs  Wiring is all #6, run is about 60 feet. Would I see a measurable improvement running panels at 96V nominal into 24V, rather than the current 48V nominal through a MX60?  Someday, I'm going to rewire this bank for 48V, but I'm trying to put off buying a new inverter for a while longer.

Thanks again, gentlemen and old farts. 

[Halfcrazy]

Hehe, if I didn't have family obligations, I'd be up there in a heartbeat populating boards for you folks. Who needs money anyway?

Thanks for the information.  So the 150 would be preferable to the 250 for this wind turbine.  I am strongly considering just ordering a second unit, rather than trying to change my order.

Without getting too off-topic, I have (eight) BP  SX170Bs  Wiring is all #6, run is about 60 feet. Would I see a measurable improvement running panels at 96V nominal into 24V, rather than the current 48V nominal through a MX60?  Someday, I'm going to rewire this bank for 48V, but I'm trying to put off buying a new inverter for a while longer.

Thanks again, gentlemen and old farts.  

Is the turbine currently wound for 24 volts?
Are you running the same blade profile as the Dans and Hugh?
If so I would suggest a 150 volt Classic.

I will have to run the numbers but I suspect you would see a difference on the pv array just because of voltage drop? It looks like that array as it stands has a Voltage drop of 1.4% with the voltage doubled it is about .4%

[kitestrings]

Vf,

Good luck.

Ryan,

Earlier you said it was nice to have the stator wound slightly higher (6-7 volt differential top bank input), so the Classic has some room to move.

I'm curious, if the Classic can also boost as discussed on another thread, why you wouldn't start lower - allowing the unit to boost in low winds - in the interst of keeping the overall voltage down on the upper range/higher winds?

Also, if 6-7 volts is desirable at 24 volts, is a 12-14 voltage differential on 48V unit a good range to shoot for, or is it not that linear?

~kitestrings