Solar panels are a great long-term investment, designed to last decades on the roof. They can withstand harsh weather conditions and usually need very little maintenance, however most solar panels benefit from an occasional clean.
As most solar panels are installed on the roof, cleaning them can be tricky. Here are your top solar panel cleaning questions answered.
Do solar panels need to be cleaned?
Solar panels generally benefit from a clean once every year or two. They’re usually installed on a tilt, meaning rainwater can wash off any dust or dirt naturally. However, over time, dirt, oils and even bird poo can build up on your panels an impede solar production.
Why do solar panels need to be cleaned?
When the sun hits a solar panel, it converts sunlight into electricity. Anything blocking a panel’s direct exposure to the sun, whether it’s shade or physical things like debris, can impact production. This means, a build up of dirt or debris on your solar panels could reduce the amount of electricity they produce.
While this is unlikely to have a major impact in the short term, over time, if your solar panels aren’t cleaned, this can impact the output of your solar system.
How often should you clean solar panels?
Generally, cleaning your solar panels once every year or so is a good guide. However, where you live and how your solar panels have been installed will both impact how often you should clean them.
You may need to wash your solar panels more regularly if:
- They're installed flat or on a lesser tilt, as rain won't wash dirt off as effectively
- You live in dry areas that get less rain
- You live near a busy roadway where the panels are exposed to more dust and oils
- You live among lots of tress where leaves or bird droppings may be more likely to build up
DIY solar panel cleaning: How to clean your solar panels
Unless you have safe access to your roof, always clean solar panels from the ground. It’s also a good idea to turn your solar system off while washing it.
In some cases, simply spraying your solar panels with a hose may be enough to wash off any dirt or debris.
For a more comprehensive clean, use a long-handled sponge or mop to gently wipe them down. Be careful not to use too much pressure.
You can use a mild detergent if you have one, however water is usually sufficient. Avoid any harsh chemicals or abrasive tools which could damage your panels.
Professional solar panel cleaning
If you can’t reach your panels safely, consider hiring a professional solar panel cleaning service.
Professional panel cleaners will give your solar panels a thorough wash using proper cleaning equipment and safety gear. Just check your solar system warranty before you get any work done to ensure a professional service won’t void it.
How much does solar panel cleaning cost?
The cost of a professional solar panel clean will depend on your home and the number of solar panels you have. Different companies will vary in price but, as a general guide, solar panel cleans usually cost a few hundred dollars.
Want to get more out of your solar system? Go all electric
By replacing old gas appliances with efficient electric alternatives, solar households can use more solar power and save even more on their energy bills.