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How To Clean Solar Panels

05/08/2025
by Rick Coleman

So, you've gone solar, good on ya! You're saving money on the power bills and doing your bit for the planet. But just like anything left out in the Aussie sun and dust, your solar panels can get a bit grubby over time. A layer of dirt, bird droppings, leaves, or even just general grime can reduce their efficiency, meaning you're not getting the most bang for your buck.

Don't worry, giving your solar panels a good clean isn't rocket science. Here's a step-by-step guide How To Clean Solar Panels, keeping it simple and safe, to help you keep those panels performing at their peak.

Why Bother Cleaning Your Solar Panels?

Before we get into the "how-to," let's quickly touch on why cleaning is important:

  • Increased Energy Production: Dirty panels can absorb less sunlight, leading to a decrease in electricity generation. Studies have shown that even a moderate build-up of grime can reduce output by as much as 20-30%!
  • Maximise Your Investment: You've invested in solar; regular cleaning helps ensure you're getting the full return on that investment over the long term.
  • Preventative Maintenance: Built-up debris can sometimes cause hot spots on the panels, potentially leading to damage over time. Regular cleaning helps prevent this.

What You'll Need for the Job

Keep it simple, mate. Here's what you'll likely need:

  • Soft Brush with a Long Handle: Think a car wash brush or a soft window cleaning brush. Make sure it's non-abrasive to avoid scratching the panels. A telescopic handle can be handy for reaching higher panels.
  • Clean Water: Tap water is generally fine. Avoid using bore water if it has high mineral content, as this can leave streaks. Rainwater is ideal if you have access to it.
  • Mild Soap (Optional): If your panels are particularly dirty, a small amount of mild, non-abrasive soap can help. Avoid harsh detergents or anything with solvents.
  • Garden Hose with Adjustable Nozzle: For rinsing.
  • Microfibre Cloth or Squeegee (Optional): For drying if you want to avoid water spots (though rainwater usually dries fairly clean).
  • Safety Gear: This is crucial! Think sturdy shoes with good grip, and eye protection if you're concerned about splashes.

Step-by-Step Guide to Sparkling Solar Panels

Alright, let's get those panels looking spick and span!

1. Safety First!

  • Turn Off Your Solar System: For your safety, it's best to turn off your solar power system at the main isolator switch before you start cleaning. Consult your system manual if you're unsure how to do this.
  • Don't Work in the Heat of the Day: The best time to clean your panels is in the early morning or late afternoon when the panels are cooler. Cleaning hot panels can cause the water to evaporate too quickly, leaving streaks, and can also thermally shock the glass.
  • Be Mindful of Heights: If your panels are on a high roof, consider whether you can safely reach them. If not, it's best to call in a professional cleaning service. Don't risk a fall!
  • Never Stand Directly on the Panels: Solar panels are not designed to bear weight and can be damaged.

2. Initial Rinse:

  • Use your garden hose to gently rinse the panels with clean water. This will help to remove loose dirt, dust, and bird droppings before you start scrubbing.

3. Gentle Scrubbing (If Necessary):

  • If a simple rinse isn't enough, mix a small amount of mild soap with water in a bucket.
  • Dip your soft brush into the soapy water and gently scrub the panels. Use long, sweeping motions. Avoid applying excessive pressure.
  • For stubborn spots like bird droppings, you may need to let the soapy water sit for a few minutes before gently scrubbing.

4. Thorough Rinse:

  • Once you've scrubbed the panels, rinse them thoroughly with clean water from your hose to remove all traces of soap and dirt. Make sure you get into all the corners.

5. Drying (Optional):

  • If you're concerned about water spots, you can gently dry the panels with a clean microfibre cloth or use a squeegee. However, a good rinse with clean water, especially rainwater, will usually dry without leaving significant marks.

6. Admire Your Handiwork!

  • Once the panels are dry, you can turn your solar power system back on. You should notice an improvement in their performance over time.

How Often Should You Clean Your Solar Panels?

There's no hard and fast rule, as it depends on your location and the amount of dust, pollution, and debris in your area. However, a general guideline is to clean your panels once or twice a year. If you live in a particularly dusty or bird-prone area, you might need to clean them more frequently. Keep an eye on their appearance – if they look noticeably dirty, it's probably time for a clean.

When to Call the Professionals

While DIY cleaning is often manageable, there are times when it's best to call in professional solar panel cleaners:

  • Difficult Access: If your panels are on a very high or steep roof that you can't safely reach.
  • Heavy Soiling: If your panels have a significant build-up of stubborn grime like lichen or moss. Professionals have specialised equipment and cleaning solutions for these situations.
  • You're Not Comfortable: If you're not confident or comfortable working at heights, it's always better to leave it to the experts.

Keeping your solar panels clean is a simple way to ensure they continue to operate efficiently and help you save on those power bills. So, grab your brush and hose, and give your panels some Aussie TLC! Buy solar panels best quality on Schnap Electrical Wholesaler.