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<blockquote data-quote="lhudson" data-source="post: 544680" data-attributes="member: 36691"><p>Hi,</p><p>I bought a couple of used panels this weekend, the rated VOC is 38V. Yesterday in full sun they only got to 29V (obviously open circuit, no load). When I put a load on them, the 250W panels peaked at 140W (using mppt grid tie inverter as load). I'm thinking the panels are bad, would you agree?</p><p></p><p>When I buy panels in the future, would you expect the VOC to be close to the rated value even on a cloudy day or would you need direct sunlight to achieve this? Are there fractions of the VOC that when missing indicate particular faults, ie, bad diode, dead cells? </p><p>Many thanks</p></blockquote><p></p>
[QUOTE="lhudson, post: 544680, member: 36691"] Hi, I bought a couple of used panels this weekend, the rated VOC is 38V. Yesterday in full sun they only got to 29V (obviously open circuit, no load). When I put a load on them, the 250W panels peaked at 140W (using mppt grid tie inverter as load). I'm thinking the panels are bad, would you agree? When I buy panels in the future, would you expect the VOC to be close to the rated value even on a cloudy day or would you need direct sunlight to achieve this? Are there fractions of the VOC that when missing indicate particular faults, ie, bad diode, dead cells? Many thanks [/QUOTE]
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