If you’ve invested in solar panels, you’re already on the path to lower energy bills and a more sustainable lifestyle. But here’s a question many solar owners forget to ask: When was the last time you cleaned your solar panels?
Just like windows or car windshields, solar panels collect dust, pollen, bird droppings, and other debris over time. While they’re designed to be low-maintenance, neglecting occasional cleanings could be costing you money.
Let’s break down how often you should clean your panels, how much it typically costs, and how much energy (and money) you could save by keeping them in top condition.
Why Clean Solar Panels at All?
Dirty panels don’t produce as much electricity as clean ones. Even a light layer of dust can reduce efficiency by 5% to 10%, and in drier climates or during wildfire season, that loss can be even greater. Over time, that adds up to:
- Lower energy production
- Reduced savings on your utility bill
- Longer payback period for your solar investment
In short: keeping panels clean = more clean energy + lower bills.
How Often Should You Clean Solar Panels?
General Rule of Thumb: Clean your panels once or twice per year, typically in spring and fall.
But your location matters. Here’s how to adjust:
- Dusty or dry areas (like California, Arizona, or Nevada): every 3–4 months
- Near trees or birds: quarterly or after major nesting seasons
- Rainy climates: once a year may be enough, but monitor performance
Tip: Monitor your solar output through your inverter or monitoring app. If production dips for no apparent reason, it might be time for a cleaning.
How Much Does It Cost to Clean Solar Panels?
The average professional cleaning costs $150-$300 per visit, depending on:
- Number of panels
- Roof pitch and accessibility
- Location and travel time
Some companies offer annual maintenance packages that include cleanings and inspections.
If you're considering DIY cleaning, remember:
- Use a soft brush, squeegee, or garden hose (no pressure washers!)
- Avoid harsh soaps or chemicals
- Work early in the morning or late in the day to prevent streaks
DIY is cheaper, but safety first, never get on your roof without proper training or equipment.
Does Cleaning Really Improve Efficiency?
Yes! Studies show that solar panels can lose up to 20% efficiency if left uncleaned in dusty environments. One analysis from the National Renewable Energy Laboratory (NREL) found that in high-soiling areas, regular cleaning can lead to a $5-$15/month increase in savings, that adds up to $60-$180 per year.
So, in most cases, a single cleaning pays for itself in energy recovered.
A Little Cleaning Goes a Long Way
You don’t need to scrub your panels weekly, but setting a schedule to check and clean them once or twice a year can make a noticeable difference. It's a simple step that helps you:
- Maximize your solar production
- Lower your energy bills
- Extend the lifespan of your system
Want help maintaining your system?
We offer professional check-ups and maintenance services to ensure your solar energy system stays in peak condition.
Need a system tune-up?
Contact us today to schedule a maintenance check and keep your solar investment performing at its best.
