Why do solar panels need to be cleaned?

2024-01-02

Many homeowners understand that solar panel systems need direct sunlight in order to function. Because solar panels are located on a home’s roof, they are bound to accumulate dust, dirt, leaves, bird droppings, and other kinds of debris. Over time, the buildup of these substances can begin to limit the amount of sunlight that the panels are exposed to, resulting in a significant drop in solar panel efficiency. This process occurs even more quickly for panels that are completely horizontal as this does not allow rain to wash away the dirt. Cleaning solar panels can keep them operating at maximum efficiency, as well as prolonging the solar panels’ lifespan. Failure to clean the panels regularly may even cause homeowners to void their solar panel warranty.

How often do solar panels need to be cleaned?

Homeowners may not be sure how often to clean solar panels. In most cases, once or twice a year is typically sufficient. However, the exact frequency that is necessary can depend on a few factors. For example, in regions that receive relatively low amounts of rainfall, panels may need to be cleaned more often. Homes whose roofs have little to no slope may also need more frequent cleaning. In the event that a neighbor is having construction done to their home, a cleaning may be necessary after the project is completed in order to remove any dust that has settled on the panels. Timing is also a factor in solar panel cleaning. The panels will need to be relatively cool so that water does not evaporate during the cleaning process. Applying cold water to hot panels can also cause them to crack. For this reason, the best times to clean solar panels are in the morning or evening, on cloudy days, or in the spring and fall months when the weather is mild.