How Can We Measure Efficiency Of Solar Cells?
Sep 26, 2009 in
diy
I can presume how to measure output power of solar cells. Then, how can I measure power of input-light? But I turn on 100V lighting, a half of power runs away as temperature. And all power of light can not reach solar cells because of attenuation, noise and so on. A laser beam is used for measuring as input-light?
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2 comments
YS on September 26, 2009 at 9:56 am
You need to know the amount of energy unfilled to the surface of the solar cell. This can be measured or estimated. Here are several sites that talk about solar radiation. There are many others if you choose to look for them;
oil field trash on September 26, 2009 at 10:05 am
A manufacturer would use a calibrated light source that provides an even 1000W / m^2 of light flux. If you want an approximate value, just take the cells out on a clear summer day at noon, and that’s about what you get, +- 25%, depending on your latitude and local pollution.
If all you are interested in is relative efficiency, then you could choose one of your solar cells as standard, and compare with that. Otherwise, you’d really need a photometer (light meter).