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They are installed about 10 inches above my sheet metal roof. The solar panels are Monocrystallin.

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    Since the design of such panels varies widely, this is probably a question for your vendor or manufacturer. – isherwood Mar 27 '20 at 16:29
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    How long have they been installed? 2 days or 2 years? – Solar Mike Mar 27 '20 at 16:44
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It isn't normal in the sense that it's normal operating procedure. It can be normal in the sense that it does happen as it is hard to keep moisture out over the long term.

That is the answer to your specific question and I wonder if you more want to know if you should or need to do something about it or can stop worrying about it.

You do need to do something about it. My understanding is that moisture degrades performance, can cause electrical issues or corrosion, and can shorten the overall lifespan of the panel. Moving forward, I suggest contacting either your installer or the manufacturer to discuss the situation and what to do about it, and who pays for it. Also I suggest reviewing your installation contract about warranty and service.

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    I agree with all the points , all the systems I have installed have been sealed for water entry, however on a cold humid night I have seen panels collect / condense moisture on the glass as soon as it warms up the moisture dissipates from the glass if any more than a mist I would be concerned for the above reasons. – Ed Beal Mar 27 '20 at 19:01
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moisture inside PV module

No, visible moisture is not normal. PV- panels are sealed and air-tight. But the sealing can suffer from mechanical stress during transport, from wrong handling, from mounting or operation. Every bending, twisting etc. should be avoided. Sometimes the building roof is under stress by setting effects, traffic, earth movings, heat etc. which impacts the panels.

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No, not normal at all and you'll want to check the warranty for the panels to see if this is covered. If there is no sign of physical damage then the seal should be intact.

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  • I agree, never seen condensation inside panels. – Polypipe Wrangler Mar 29 '20 at 1:45

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