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  • How do you clear a solar panel?

    I bought a solar panel from ReneSola last year. How do you clear a solar panel?

  • #2
    Never heard of clearing a solar panel. Propably should explain what you mean as there looks to be a terminology problem here.

    WWW

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    • #3
      Because it is summer at the moment, I suspect you mean - clean a solar panel? I recommend mounting them on a minimum 15deg tilt and just wait till it rains. Don't sue me 'cause you fell off your roof cleaning them. Yes, they will be a bit dirty at times, so install a few more of them (panels are so much cheaper now) and forget it.
      BSEE, R11, NABCEP, Chevy BoltEV, >2000kW installed

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      • #4
        Originally posted by solarix View Post
        Because it is summer at the moment, I suspect you mean - clean a solar panel? I recommend mounting them on a minimum 15deg tilt and just wait till it rains. Don't sue me 'cause you fell off your roof cleaning them. Yes, they will be a bit dirty at times, so install a few more of them (panels are so much cheaper now) and forget it.
        If cleaning: Do [U]NOT[/U] spray water on a hot panel. That means avoiding doing so except early morning or early evening, preferably early morning.

        As for buying/installing a few more, with no disrespect intended, I'd note that comment was made by someone who seems to be a vendor.

        However, such a suggestion may well make and exhibit a lot of (common) sense given most folks lax attitude and understanding of what they have and how it works. Of all the arrays in my HOA, I know of only one that gets cleaned on a regular basis, or at all.

        Panel fouling rates are as variable as location, so it's hard to nail down. I'd suggest hosing an array off every month or so may be more cost effective than increasing an array size by, say 10% or so.

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        • #5
          I think dust seems like more of a problem than it really is. At our state radio sites, we never clean the panels and it's never been an issue. I don't think it's ever even been discussed.
          At the end of summer I had a brown layer of filth on my home array, and after hosing them off the output was 5% higher.
          I don't think I'll ever bother to clean them again, I'll just let the rain do it.

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          • #6
            Originally posted by sdold View Post
            I think dust seems like more of a problem than it really is. At our state radio sites, we never clean the panels and it's never been an issue. I don't think it's ever even been discussed.
            At the end of summer I had a brown layer of filth on my home array, and after hosing them off the output was 5% higher.
            I don't think I'll ever bother to clean them again, I'll just let the rain do it.
            I've been attempting to keep track of my array's fouling for over a year now. As an educated guess, my array fouls at a VERY approx. rate of about 1%/week without rain. My GUESS is that the rate of fouling will become asymptotic at some point, but I've not had a rain free period long enough to verify that guess.

            I was in Death Valley last year and had a lengthy discussion with the resident engineer about their 1MW array. It's been in operation for several years and they clean it on a 2 yr. schedule to get the guano off. The engineer reported no significant performance degradation.

            Also, there is a 1.2 MW array within sight of my home. In 4 years, I've not seen any activity on that array.

            So, until/if ever panel fouling gets a quantitative determination, it may well be the great unresolved question in solar energy applications.

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            • #7
              Originally posted by sdold View Post
              I think dust seems like more of a problem than it really is. At our state radio sites, we never clean the panels and it's never been an issue. I don't think it's ever even been discussed.
              At the end of summer I had a brown layer of filth on my home array, and after hosing them off the output was 5% higher.
              I don't think I'll ever bother to clean them again, I'll just let the rain do it.
              Just send a Redneck up there with a case of beer. He will gladly hose them down for free.
              MSEE, PE

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              • #8
                Originally posted by Sunking View Post
                Just send a Redneck up there with a case of beer. He will gladly hose them down for free.
                I can just imagine said Redneck (not you, of course) finding a nick in the insulation of a 400V string....
                It is a good maintenance test as well as cleaning.
                SunnyBoy 3000 US, 18 BP Solar 175B panels.

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                • #9
                  Originally posted by inetdog View Post
                  I can just imagine said Redneck (not you, of course) finding a nick in the insulation of a 400V string....
                  It is a good maintenance test as well as cleaning.
                  Don't laugh learned that lesson as a kid on a farm with an electric fence. Only thing funnier was seeing a dog learn that lesson. Took 2 days to find him.

                  FWIW you can call me a Redneck anytime. I wear that label with PRIDE. But this Redneck is on the wagon.
                  MSEE, PE

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                  • #10
                    Originally posted by Sunking View Post
                    Don't laugh learned that lesson as a kid on a farm with an electric fence. Only thing funnier was seeing a dog learn that lesson. Took 2 days to find him.

                    FWIW you can call me a Redneck anytime. I wear that label with PRIDE. But this Redneck is on the wagon.
                    OMG! thanks for the laugh!!!
                    [B]N00B[/B]

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                    • #11
                      Originally posted by Sunking View Post
                      Don't laugh learned that lesson as a kid on a farm with an electric fence. Only thing funnier was seeing a dog learn that lesson. Took 2 days to find him.

                      FWIW you can call me a Redneck anytime. I wear that label with PRIDE. But this Redneck is on the wagon.
                      Not trying to assert that Redneck is a negative description. Just that you would not be the one up on the roof. Some Rednecks are smarter or have more experience than others.
                      SunnyBoy 3000 US, 18 BP Solar 175B panels.

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                      • #12
                        Originally posted by sdold View Post
                        i think dust seems like more of a problem than it really is. At our state radio sites, we never clean the panels and it's never been an issue. I don't think it's ever even been discussed.
                        At the end of summer i had a brown layer of filth on my home array, and after hosing them off the output was 5% higher.
                        I don't think i'll ever bother to clean them again, i'll just let the rain do it.
                        renesola
                        Last edited by solar pete; 07-29-2015, 09:15 PM.

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                        • #13
                          Originally posted by weijing3333 View Post
                          RENESOLA solar panels maybe needn't to clear?
                          I'm sure they are all about the same. It's just that this dust in this area doesn`'t seem to cause much degradation and it rains once in a while.

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                          • #14
                            Originally posted by sdold View Post
                            Say NO to useless over-quoting
                            NO to useless over-quoting!
                            SunnyBoy 3000 US, 18 BP Solar 175B panels.

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                            • #15
                              At least there isn't any top posting

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