Quote:
Originally Posted by lotech
I am newbie in Solar energy and experimenting with different panels, I got a 4W Amorphous panel and a 6W CIGS panel, I put them to the test on a half sunny day. I find the Amorphous panel put out as much as 50% higher open voltage than the CIGS one, I got 18V on the Amorphous and about 10v on the CIGS, when put under full sun both panel perform near the same but the Amorphous one still put out little more. I read that CIGS panel performs well in low night but the test result doesn't support that, I don't know if my panel is faulty or it hasn't been soak in the sun long enough.
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When you say "open voltage" I assume open circuit voltage. That is, when not supplying any load power. That alone isn't a very good measure of performance.
For a like-for-like comparison, you'd really need to measure power output from each under the same conditions.