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Real world experience: Two friends of mine have just passed through the Suez Canal after sailing in the Pacific since 1997. They have two fixed mount solar panals on the coach roof, subject to frequent shading... I belive they are 1995 vintage 100w Siemens, but may be Arcos. They also purchased two 40w Unisolar flexible panals. For over 7 years, they actually got more power from the Unisolars, because they would move them to whatever location was unshaded.
The Unisolars were delaminating (i think both, but maybe just one) and their output was dropping. They wanted 3 more to replace them, but alas, Unisolar had gotten out of the consumer flexible panal business, and were no longer available. They bought a wind generator.
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