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ChrisOlson

Regular Member

Joined: 19/01/2010
Location: United States
Posts: 60

Posted: 12:24pm 01 Jan 2013

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For folks who want to build their own off-grid wind turbine in 2013, I have a new direct-drive machine that is designed from the ground up to work with a MidNite Classic 150 MPPT controller. The details of how to build it, and the specs for it, are on the new off-grid projects page that I put on my website

http://dairylandwindpower.us/projects/

This new turbine has been flying on one of my towers since early December. With a 3.2 meter rotor on it it produces 150 watts @ 10 mph, 250 watts @ 12 mph, 480 watts @ 15 mph, 1,080 watts @ 20 mph, and 2,000 watts at 25 mph. It will peak around 2.5 kW on a 24V system and 3 kW on a 48V system.

On my 48V system I have the Classic set to engage the voltage clipper at 145 volts input to the controller and have seen the machine producing 3,100 watts and 52.6 amps to the battery @ 144 volts controller input. It's best daily energy production so far was Dec 20 when it produced 26.4 kWh in a 24 hr period.

It will also work on a 12V system, however, its peak output is de-rated to 1.2 kW to the battery because the Classic 150 can only put out around 90 amps continuous. So the voltage clipper on a 12V system will get a serious workout at wind speeds much over 20 mph.
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Chris Edited by ChrisOlson 2013-01-02

off-grid in Northern Wisconsin, USA

fillm

Guru

Joined: 10/02/2007
Location: Australia
Posts: 730

Posted: 05:25pm 01 Jan 2013

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Hi Chris,

Good to see someone from fieldlines dropping in over here , looks like a nice mill to match with the Midnite Classic .
I don't think the Classic 150 is readily available in AUS but it could be easily imported but would cost a bit in freight.

I have also just put up my new AXIAL see thread here , I am more into using caps to lower the resistance of the windings to stop the inherent problem that AXFX's have with overheating , although I also like the GOE222 blades for their relentless power at low RPMs . And the new mill is doing Very well with cut-in at 6~7klm(4mph) and easily by 10klm( 6mph ) 120~ 150W , but I am running with a 3.6m blade set .
The best I have seen so far is 1995W @ 34klm ( 21mph )@ 270rpm with virtually no stator temp rise as I am monitoring the stator temp continuously.

We have found that the use of Cap/doubles - treblers etc, is a very easy way to improve windmill performance and keep resistance low but over there the Idea has not been embraced with much enthusiasm , anyway each to their own.

Keep up the good work and hope to see more of your work here .

PhillM ...Oz Wind Engineering..Wind Turbine Kits 500W - 5000W ~ F&P Dual Kits ~ GOE222Blades- Voltage Control Parts ------- Tower kits

ChrisOlson

Regular Member

Joined: 19/01/2010
Location: United States
Posts: 60

Posted: 05:40pm 01 Jan 2013

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Thanks fillm!

Every new design that I've gotten built and tested, I've tried to post it on The Back Shed as well. There's been some problems on fieldlines when they've moved to different server directory structure or something where the images get lost. Thankfully I've kept copies of the projects I've done, and I got my own website to put them on now for homebuilders so stuff won't get lost.

I've seen oztules discussing using caps but I've never tried it myself.
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Chris

off-grid in Northern Wisconsin, USA

yahoo2

Guru

Joined: 05/04/2011
Location: Australia
Posts: 1166

Posted: 04:36pm 02 Jan 2013

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There is a company called DC solutions australia that is importing some of the midnite solar gear, they have really sharpened their pencil on pricing recently, but I have no idea on their resources to warranty or service the units.

I'm confused, no wait... maybe I'm not...

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