Cleaning solar panels effectively

aminaelis
aminaelis Registered Users Posts: 14 ✭✭
in Solar Beginners Corner #1
Hello everyone,

I am totally new to this whole solar panel concept. We just moved to a house with solar water heater and since it hasn't been lived in for quite some time, we have a lot of things to fix, clean and so on. What is the best way to clean solar panels? Ours are dusty and also there are many pipes and wires around them, some in pretty bad shape but our landlord said it's fine.

Is there any effective and gentle way to clean solar panels? 

I will look forward to reading your suggestions :). 
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  • mcgivor
    mcgivor Solar Expert Posts: 3,854 ✭✭✭✭✭✭
    #2
    Wash in the morning or late afternoon using plain water and a sponge squeegee seems to work in most cases, be generous with the water to float the dirt off. Hard water can leave deposits but generally less than the dirt it replaces, that's the method I use, water then squeegee dry, others may have differing opinions and suggestions.
    1500W, 6× Schutten 250W Poly panels , Schneider MPPT 60 150 CC, Schneider SW 2524 inverter, 400Ah LFP 24V nominal battery with Battery Bodyguard BMS 
    Second system 1890W  3 × 300W No name brand poly, 3×330 Sunsolar Poly panels, Morningstar TS 60 PWM controller, no name 2000W inverter 400Ah LFP 24V nominal battery with Daly BMS, used for water pumping and day time air conditioning.  
    5Kw Yanmar clone single cylinder air cooled diesel generator for rare emergency charging and welding.
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  • Solray
    Solray Registered Users Posts: 246 ✭✭✭
    #3
    Use a window cleaning wand and water with a little glass cleaner such as is used for automobile washer fluid reservoirs.
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  • Estragon
    Estragon Registered Users Posts: 4,496 ✭✭✭✭✭
    #4
    These may be solar thermal, not pv. If so, they may be made of a type of rubber that may be damaged by certain chemicals. A windshield cleaner, for example, may contain an anti-freeze that can cause problems with some types of rubber.

    I would use a soft brush or duster to get most of it off, then hose down with plain water. If needed a little gentle detergent for tough spots and a freshwater rinse.
    Off-grid.  
    Main daytime system ~4kw panels into 2xMNClassic150 370ah 48v bank 2xOutback 3548 inverter 120v + 240v autotransformer
    Night system ~1kw panels into 1xMNClassic150 700ah 12v bank morningstar 300w inverter
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  • Solray
    Solray Registered Users Posts: 246 ✭✭✭
    #5
    I wouldn't leave anything on the panels after cleaning even if it's just water. A lot of folks don't have a hose they can use if they are off grid and using bottled water, so a hose is not always an option. Whatever you use, make sure you dry off everything when done. :)
    That should be obvious.
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  • myocardia
    myocardia Solar Expert Posts: 118 ✭✭✭
    #6
    Solray said:
    I wouldn't leave anything on the panels after cleaning even if it's just water. A lot of folks don't have a hose they can use if they are off grid and using bottled water, so a hose is not always an option. Whatever you use, make sure you dry off everything when done. :)
    That should be obvious.
    Google "solar thermal panel", and you'll understand. They have zero glass, and produce zero voltage. They produce nothing other than heat (by being black, and absorbing sunlight), which in turn, heats the water.
    DoD= depth of discharge= amount removed from that battery   SoC= state of charge= amount remaining in that battery
    So, 0% DoD= 100% SoC, 25% DoD= 75% SoC, 50% DoD= 50% SoC, 75% DoD= 25% SoC, 100% DoD= 0% SoC
    A/C= air conditioning AC= alternating current (what comes from the outlets in your home) DC= direct current (what batteries & solar panels use)
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  • Solray
    Solray Registered Users Posts: 246 ✭✭✭
    edited July 2017 #7
    Mine have glass panels that cover them and cause the heat to intensify.
    The OP did not specify what type they have.
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  • littleharbor2
    littleharbor2 Solar Expert Posts: 2,109 ✭✭✭✭✭
    #8
    I use a large squeegee/scrubber with a long screw in broom handle and a medium sized ice chest that the squeegee fit into. Works great although my array is on a flat roof so access is easy.

    2.1 Kw Suntech 175 mono, Classic 200, Trace SW 4024 ( 15 years old  but brand new out of sealed factory box Jan. 2015), Bogart Tri-metric,  460 Ah. 24 volt LiFePo4 battery bank. Plenty of Baja Sea of Cortez sunshine.

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  • myocardia
    myocardia Solar Expert Posts: 118 ✭✭✭
    #9
    Solray said:
    Mine have glass panels that cover them and cause the heat to intensify.
    Your solar thermal panels have glass over them, or your electrical solar panels (PV, in other words) have glass over them? If you mean thermal panels, what brand are they?

    @littleharbor2 that's cheating! You could do back-flips on that low, flat roof. :D
    DoD= depth of discharge= amount removed from that battery   SoC= state of charge= amount remaining in that battery
    So, 0% DoD= 100% SoC, 25% DoD= 75% SoC, 50% DoD= 50% SoC, 75% DoD= 25% SoC, 100% DoD= 0% SoC
    A/C= air conditioning AC= alternating current (what comes from the outlets in your home) DC= direct current (what batteries & solar panels use)
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  • cow_rancher
    cow_rancher Solar Expert Posts: 117 ✭✭✭✭
    #10
    myocardia said:
    Solray said:
    Mine have glass panels that cover them and cause the heat to intensify.
    Your solar thermal panels have glass over them, or your electrical solar panels (PV, in other words) have glass over them? If you mean thermal panels, what brand are they? 
    "Good" Solar hot water panels have glass-aluminum construction, I have 4 from a previous house, which were Sunpower out of Phx, not sure it's the same Sunpower as today, this was from back in the 70's, I also have 4 new which were an insurance replacement from a fire that took out the other 4 sunpower panels that I was going to use.  The new ones are "Gobi", when installed, which hopefully will happen this fall, it should heat my hydronic floors about 80-90% of the time.  My location is SouthEastern AZ, at 5,000 feet.

    Solar panels without glass are most likely for heating pools.

    Rancher
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  • littleharbor2
    littleharbor2 Solar Expert Posts: 2,109 ✭✭✭✭✭
    #11
    myocardia said:



    @littleharbor2 that's cheating! You could do back-flips on that low, flat roof.


    But too low to do a triple lindy into the pool. B)

    2.1 Kw Suntech 175 mono, Classic 200, Trace SW 4024 ( 15 years old  but brand new out of sealed factory box Jan. 2015), Bogart Tri-metric,  460 Ah. 24 volt LiFePo4 battery bank. Plenty of Baja Sea of Cortez sunshine.

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  • aminaelis
    aminaelis Registered Users Posts: 14 ✭✭
    #12
    Thank you everyone for your replies.  ;)  I cleaned them as instructed, wiped them as dry as possible too. Although, when it rains here, it often makes them more dusty again because rain picks dust and sandy particles - it's desert like landscape around. So they will need this clean up pretty often I guess...
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  • aminaelis
    aminaelis Registered Users Posts: 14 ✭✭
    #13
    And I also noticed that neighbors do not really bother much with cleaning their solar installation...  :D
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  • littleharbor2
    littleharbor2 Solar Expert Posts: 2,109 ✭✭✭✭✭
    #14
    Incidental dust/dirt on the surface of your panels doesn't affect their output by much. There have been a few discussions here over the years documenting the losses from dirty panels. I removed a "non functional" system once where the panels were mounted on a flat roof. They were so covered in dirt that you couldn't tell if there were solar panels under there or plywood rectangles, or ??. Everything worked fine once cleaned. If you have birds liking to congregate on your array, that's a different story. their droppings will shade some cells, which might as well be all of them in series strings,

    2.1 Kw Suntech 175 mono, Classic 200, Trace SW 4024 ( 15 years old  but brand new out of sealed factory box Jan. 2015), Bogart Tri-metric,  460 Ah. 24 volt LiFePo4 battery bank. Plenty of Baja Sea of Cortez sunshine.

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  • Lumisol
    Lumisol Registered Users Posts: 374 ✭✭✭
    #15
    I use a diluted washer solution for auto windshields, it's made specifically for cleaning glass that is held in place with rubber gaskets and is safe for glass, rubber and paint.
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