How to clean a solar panel

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Photo courtesy of naturalturn at Flickr.com

Over time, solar panels will get covered with dust, grime, and even bird droppings. These obstructions block sunlight and will reduce power production. The solution is simple though – clean your solar panel when it gets dirty!

Each solar panel is different, so make sure to review the instructions from the manufacturer before cleaning the panel. Some panels are sensitive to certain chemicals, and others may have fragile components that you should be aware of. So, read those manuals first.

If your panel is a standard design, then cleaning a solar panel is just like cleaning a window. The “live” electrical components are isolated behind glass or plastic shielding, and all that needs to be cleaned is the outside. Before washing the glass, make sure that there aren’t any cracks or loose wiring. If there are, it might be a good idea to call a technician instead!

Here are the supplies you’ll need:

  • *A bucket full of water
  • *A soft sponge or towel
  • *A drying cloth that wont scratch the panels
  • *Cleaning soap (optional)
  • Green cleaning supplies do a great job on glass and solar panels. There are several varieties of streak free glass cleaner available commercially. You can also cook up non-toxic cleaning solution at home. Here’s a simple recipe for eco-friendly glass cleaner:

    Make a great all-purpose window cleaner by combining 1/4 cup vinegar, 1/2 teaspoon liquid soap or detergent, and 2 cups of water in a spray bottle.

    Use the soapy water to wash the surface of the solar panels, and brush away any visible dust or streaks. Gentle scrubbing may be necessary. After wiping away dirt, it’s a good idea to dry the panels off. Dissolved grime has a tendency to move around rather than wash away. Wiping up the wet areas does a thorough job of removing all of the silt and it also prevents water spots.

    That’s it! Compare the output of your solar panels before and after cleaning. When output starts to fall again, it’s probably time for another quick rinse.

    PE - how to clean a solar panel - bkusler FL resized
    Photo courtesy of bkusler at Flickr.com

    For solar panels in hard to reach areas (ie; on the roof of an isolated lighthouse or attached to a satellite in space) automatic cleaning systems are a popular option. Most of these automatic systems work like windshield wipers, brushing dust away from the solar panels with a spray hose and mechanical arm. Automatic cleaning devices add a little bit of cost to a solar panel system, but they may be worthwhile in dirty or hazardous settings.

    Just a side note – roof mounted solar panels are sometimes laid out to be self cleaning. There’s less need to clean a solar panel if it isn’t dirty!

    Interested in building your own solar panels to save money? Check this out.