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“Maybe when I retire I’ll get a long pole and squeegee the lot of them every morning.”
Photo Credit: iStock
A homeowner in the U.K. said a single rooftop solar panel produced far more power after they wiped away morning dew before the panel dried naturally.
That before-and-after reading, from 70 watts to 140 watts, prompted questions from the r/SolarUK subreddit about the nature of the increase.
Writing in a Reddit thread, the poster described using a squeegee on one damp panel ahead of direct sun. Their key observation was simple: “It jumped from 70W to 140W!”
That prompted a familiar maintenance question for people with rooftop systems: whether a quick pass to clear water from the surface can translate into extra electricity. Here, the change looked large, though it came from a very small sample size.
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If watching a panel jump from 70 watts to 140 watts has you thinking bigger, going solar is one of the best ways to save money on home energy. You can use EnergySage to get free solar installation estimates and compare quotes.
Instead of treating the result as proof, many replies zeroed in on the test setup.
“Are you sure that in the time it took you to squeegee the panel it didn’t just get more bright outside?” a user reacted. “I really sincerely doubt that morning dew would reduce the efficiency of a panel by 50% lol.”
Because panels often ramp up rapidly as daylight intensifies, output may have been headed upward even without touching the glass. Dew removal could still help a panel get going a bit earlier, but the thread did not show how much of the extra 70 watts came from the squeegee itself. Still, the idea got the community thinking.
“Someone somewhere has enough time, money and need for YouTube views to install HGV windscreen wipers and washers on each of their panels for science…” a user mused, before jokingly taking ownership if the ploy worked.
Anyone tempted to try the same experiment should measure carefully. A single dewy panel, one short morning test, and a jump from 70W to 140W may be interesting, but that is not the same as proof.
The poster’s own closing joke captured that balance between curiosity and practicality: “Maybe when I retire I’ll get a long pole and squeegee the lot of them every morning…”
If that small morning test gets you interested in the larger economics of rooftop solar, EnergySage can be especially helpful. With EnergySage’s help, the average person can save up to $10,000 on solar purchases and installations. 
💡Go deep on the latest news and trends shaping the residential solar landscape
EnergySage’s solar map shows the average cost of a home solar panel system on a state-by-state level, as well as details on solar panel incentives for each state. Together, these resources can help homeowners get the best price for rooftop solar panels and access available incentives.
And if you are already thinking beyond the original poster’s theatrics, battery storage can have a much bigger impact. Adding battery storage to a solar setup is one of the best ways to protect your home during outages, save money on energy, and go off-grid. Explore EnergySage for information about home battery storage options, including competitive installation estimates.
If that dewy-panel experiment got you curious, there are plenty of examples of the practical questions homeowners keep running into with solar. 
• Homeowners found a simple rinse can unlock about 5% more solar power.
• Solar experts warned that common cleaners on solar panels can do more harm than dirt.
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© 2025 THE COOL DOWN COMPANY. All Rights Reserved. Do not sell or share my personal information. Reach us at hello@thecooldown.com.

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