In optimal installations for both, does wind ever beat solar?

Replies to This Discussion

Permalink Reply by Leo Klisch on March 31, 2011 at 12:23pm

It's a reasonable start anyway. However the 35 foot tower is no where near high enough, especially with the tall trees in the photo. 90 ft would be a minimum height and mite double the average wind speed to get eight times the kwh but 110 would be better even with a cost increase. I know Southwest Wind is coming out with a low start up wind speed turbine this year and that up the yearly output of the turbine. The other factor is the life time performance and the expected life time or replacement cost at end of life.

Permalink Reply by Chris Kaiser on April 4, 2011 at 7:00pm

Good input Leo, but how many residential wind turbines are on towers over 90 ft?  I wonder how practical that is in practice?  And even then, does the wind turbine outperform solar?  My gut is telling me no.

Permalink Reply by David Eggleton on April 4, 2011 at 7:10pm

On cloudy days, especially when they are contiguous and numerous, wind will provide greater benefit.

What is the larger question?  How flexible are the people (and other entities) involved?

Permalink Reply by Chris Kaiser on April 4, 2011 at 7:44pm

David, did you check out the original post? I'm speaking on an annual basis.  Cloudy days don't necessarily mean wind, and solar will still produce electricity even on cloudy days.  On an annual basis, I'd be surprised if there were many places where resi wind beats solar. 

Permalink Reply by David Eggleton on April 4, 2011 at 7:52pm

Nope.  I responded to your question.  It wasn't serious?

Who lives on an annual basis?

Permalink Reply by Chris Kaiser on April 4, 2011 at 8:03pm

Ok, I didn't word my question effectively.  What I meant to say, "Even on a 100 ft tower, does a wind turbine outperform solar on an annual basis"  Again, I'm sure there are locations where this is the case, but these are few and far between, and outside of the majority of the U.S. population.

 

Everyone lives on an annual basis when it comes to analyzing what the better return on energy investment is.

Permalink Reply by David Eggleton on April 4, 2011 at 8:29pm

"Everyone lives on an annual basis when it comes to analyzing what the better return on energy investment is."

Then, hopefully, each is very flexible.  Lately, fewer and fewer days seem to be average days.

Permalink Reply by Chris Kaiser on April 5, 2011 at 4:49am

Well Dave, luckily I have one of the most popular posts on the web for finding your city's temperature and weather history.  Of course I haven't instructed people how they can predict the future, but based on all available information, I can tell them what their best available options are.

Permalink Reply by David Eggleton on April 5, 2011 at 5:37am

Thanks for what you're doing, Chris.  I hope your feeling was that I was playing with you in a friendly way.

Permalink Reply by Chris Kaiser on April 5, 2011 at 5:57am

No worries!   But seriously, let's try and get to the bottom of this issue!  I would like to do enough research and then come out with some conclusions that all Energy Pros can use to recommend clean energy systems.

Permalink Reply by Leo Klisch on April 5, 2011 at 11:37am

At a Minnesota Energy Conference I met a wind and PV solar installer. He sells and installs both Southwest wind systems and Sunpower PV(one of the highest efficiencies in the industry) systems. He monitored both a 2.4 kW wind turbine and a 4.14 kW PV array for 16 months. Wind was at 4200 kWh and the PV at 11,000 kWh. The tower was 33ft high on flat mostly unobstructed terrain. No shading of PV however the ground mount array was automatically articulated from sunrise to sunset and the north to south angle was adjusted twice per year. This is a guess,but articulation could double the yearly output of PV. This was a south central Minnesota Location with an average wind speed of 11.5 to 14 mph depending on the exact location of the turbine.  The cost of the wind system installed was $19,500 and for the PV installed was $30,000 to $40,000. They sell a 10kw Ventura turbine that could output 17,000kwh/yr for $60,000 to $65,000.

Permalink Reply by Chris Kaiser on April 5, 2011 at 11:53am

Leo,

That's a great example.  Most people would assume that wind would kick solar's butt in MN.  Even if you halved the size of the PV array (and then had the installed cost under the wind cost) it would still produce more kWh than the wind!  

• ‹ Previous
• 1
• 2
• Next ›
• Page