Panel efficiency is a little different then cell efficiency, when you put cells in a panel they are not as efficient as a single cell in lab test equipment.
You can see the efficiency leaders in each category below and the link will take you too a good site for panel efficient ratings. If your Chinese manufacturer is telling you there panels are 20% efficient and they don't use SunPower cells then you should buy your panels someplace else.
- 21.5% SunPower solar modules hold the commercial solar module efficiency record. SunPower's SPR-327NE-WHT-D modules are also the leading solar modules in solar module yield field tests, and other SunPower solar modules come in #2 and #3 in those tests. (For those of you to who this matters or is interesting, SunPower is a US-based solar panel company.)
- 17.4% Q-Cells thin-film solar modules hold the record in this specific solar panel category. Thin-film solar panels are widely used, but not in residential applications. (Q-Cells was a German company, but it filed for insolvency in 2012 and was then acquired by the Korean company Hanwha.)
- 16.1% First Solar thin-film solar modules claim the cadmium-telluride (CdTe) photovoltaic (PV) module conversion efficiency record. Again, these are generally not used for residential applications, but I think including them helps to reinforce my key point yet again. (First Solar, a US-based company, was actually the #1 solar developer and the #2 solar module manufacturer in the world last year. Despite a relatively low 16.1% record efficiency in this category of solar panels, First Solar does very well with these relatively cheap solar modules in certain applications.)
On Jun 12, 2014, at 1:57 AM, "Hannu Venermo gcode.fi@gmail.com [electricboats]" <electricboats@yahoogroups.com> wrote:
The majority of PV panels are made in china, these days.
The std efficiency these days is around 20%.
Std retail prices /costs are about 0.70$ / watt.
So, its not just sunpower but any nr of others, as well.
About 20 manufacturers, iirc.
On 11/06/2014 20:51, James Sizemore yamez4u@gmail.com [electricboats] wrote:
> No matter who the panel maker is. If the panel has better then 18%
> efficiency it is almost certainty made with SunPower cells.
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-hanermo (cnc designs)
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Posted by: James Sizemore <yamez4u@gmail.com>
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