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Solar is All About Efficiency -- Business Efficiency

By Stephen Lacey, Editor
April 7, 2011   |   9 Comments

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9 Reader Comments
Comment
1 of 9
April 7, 2011
Hi:

Basically agree but with that said, module eff. is still horrible and the total net eff is usually 12% to 15% turning 85% of the energy into heat contributing to warming. It was at least 3 years ago I read on this site, 2 or more articles on breakthroughs in full spectrum solar cells. Where are they? Where are even the prototypes? These were, as I recall, breakthroughs from places like MIT and IBM, etc., not some start up off road venture capital sales ad. Anotherwards credible. Net eff needs to get over 30% to really turn a corner.

.....Bill
Comment
2 of 9
April 8, 2011
I think we are looking at this problem in the wrong way. While we have spent so much time focusing on the $/watt cost of this widget or that process, precious little time has been devoted to looking at the value of the energy generated by the system when it is placed into service. Not all products and designs produce the same results across all utility sectors and territories. While it terrifically complicates the analysis, it delivers better results that we can feed back into the system to get a more balanced understanding of what the actual problems are in system designs. A much more micro-regional approach is needed.
Comment
3 of 9
April 9, 2011
Hi Pam:

I would agree on your micro added approach as to better define nuances. However there are simply many ways that positives can not be allocated to dollars. That is simple fact. Because that is true, it does not logically follow that the attributes have no value in the decision process.
I recently attended a Marcellus Shale seminar that was sponsored by our local chamber of commerce. The speaker was a Hydro Geologist that lived out by Penn State main campus, and was involved in there MS outreach program.
Without going into allot of detail, it was expectedly entertaining to see the language used to "half say" and leave out various pieces of information to skew Shale Gas extraction in a positive direction. One outright lie was when he was stating how the 5 cleared acres of woods on average for the "well site", would produce more energy from the NG extraction than if a wind turbine occupied the location. He then gave KWH numbers for the NG and the turbine, with the NG number being much bigger. The real truth, is that land can produce an infinite amount of power from wind or PV, and only a finite amount from fuel extraction. The NG will run out, the wind and sun will never run out. Infinity is an infinite amount of times bigger than any finite number, so a total energy dollar yield comparing the NG dollar value to wind or sun power based on the forest displacement is mathematically impossible. One tiny example, but it shows the game playing and distortions used when dealing with cost justifications.
BTW, he did not use the phrase, "peak power" or equipment life cycle in the presentation of those numbers. This section was part of his presentation regarding land impact.

.....Bill
Comment
4 of 9
April 12, 2011
Stephen:
When I first read the title of you article, "Solar Is All About
Efficiency," my first thought was, "hey, an article about solar thermal." Then I finished reading the rest of the title.

Your article was well written but when are we going to stop treating "thermal" like it's not even there?
Hawaii may have the answer, since they installed 10,000 solar water heaters in 2010.

Jim Lindsey solarplexusco.com
Comment
5 of 9
April 12, 2011
Sooner or later, we will notice that PV is a big corporate focus. Sooner or later, we will notice that thermal better serves us and the communities and businesses that matter to us.

Every building standing today is a solar collector anyway. Putting that energy to good use is our best solution.

Low profile commercial buildings can best harvest and employ that energy. Futura Solar is focused on exactly that. We;ve revived sawtooth type roofing with additional solar benefits. Sawtooth roofing always provided daylighting, another little hyped solar technology. To that we've added solar air, yes, solar air. The two pass air heater serves in part as an air handler and also hosts the PV and/or SWH. The daylighter does not admit solar loading into the interior of the building. The 2 pass air heater harvests most of the solar loading for use inside the commercial process housed in the building.

The sun will do more than bake the tourists, it will provide a competitive advantage.
Comment
6 of 9
April 13, 2011
@Jim -- You make a great point. I'm not purposefully avoiding solar thermal. The PV America conference revolved around photovoltaics, so that's what we focused on!

I agree that we need more attention to solar thermal though...

Thanks. -Stephen
Comment
7 of 9
April 13, 2011
I read recently that some states have addressed non-hardware factors like permitting. Anyone gotten traction with a statewide permitting process?
Comment
8 of 9
April 13, 2011
TrahanM (hi Mike!) - Keep you eyes out for the California Solar Challenge, Bay Area cities are working to race to streamline and reduce permitting costs/process first.

Check out Santa Clara, CA for an example of a one-stop over the counter process for solar permits.
Comment
9 of 9
April 13, 2011
At a $1/W will there still be enough profit in solar to have a robust and diverse industry? What kind of profit margin should we expect companies to have in this industry? How close are we now? I have not seen this factored into the $1/W discussions to date.


Bill,

Those higher efficiency PV cells are in CPV systems where you can use a little cell to gather a lot of sun. If you tried to make a standard flat plate PV module out of them even you might not be willing to pay the price to do the right thing. The theoretical efficiency limit on Si cells is 29% so to top that we need a better process to use the more expensive and more efficient material. Even with the best materials cell efficiency has not broken out of the low 40% area.
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