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Solar panel cleaning and maintenance guide

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roof solar

Regularly cleaning and maintaining your solar panels keeps them producing renewable energy at their best. This guide covers the best ways to clean PV panels, when to call in a professional cleaning service, and how to create a solar maintenance schedule that helps keep them going for decades.

Key Takeaways

How to clean solar panels step-by-step

Here’s a simple, step-by-step guide to cleaning your solar panels.

  • Switch off the system: Turn off your solar panels at the fuse box before starting any cleaning to prevent any safety risks.
  • Use the right safety equipment: Ideally, clean from the ground using extendable cleaning tools. If cleaning from the roof, secure ladders, wear non-slip footwear, and use harnesses where possible.
  • Choose a cool day: Use lukewarm water on a cool day to avoid streaks and damage. Cleaning with cold water under direct heat on a sunny day can cause thermal shock (sudden temperature changes that stress the glass and risk it shattering).
  • Start with a visual inspection: Look for cracks, loose cabling, or signs of water damage before cleaning. If you spot an issue, stop and call a solar panel installer.
  • Gentle cleaning: Use lukewarm water, a microfiber cloth, or a soft brush. Avoid abrasive tools and chemical soaps to keep the panels in the best condition.
  • Remove debris and bird droppings: These block sunlight and can cause localised heating on the PV panel surface. A soft cloth or brush removes them without scratching.
  • Rinse carefully: Use a hosepipe with a gentle spray. Never use a high-pressure washer, as it can damage seals, wiring, and the panels themselves.
  • Check your maintenance manual: Manufacturers often include cleaning guidelines specific to your solar panel system, coatings, or self-cleaning glass features.

Did you know? If your solar panel installation has self-cleaning coatings or glass, rainfall will handle most cleaning! Even so, it’s worth doing occasional checks to make sure there’s no damage and your solar panel installation is working efficiently.

Is it worth getting solar panels cleaned for you?

If you’re not comfortable cleaning your solar panels, don’t worry – you can get your solar panels cleaned for you. Professional solar panel cleaning comes with several benefits, including:

  • Safe access to hard-to-reach panels: Professionals have the right equipment to clean roof-mounted solar arrays without as much risk.
  • Warranty protection: Some performance warranties require professional cleaning or inspections by an MCS-certified solar installer.
  • Extra peace of mind: Professionals can spot early signs of degradation, loose connections, or other issues during the clean.
  • Time savings: Arranging a professional cleaning service saves you the hassle of climbing onto your roof and carrying out the work yourself.

How much does it cost to have my solar panels cleaned?

The cost of professional solar panel cleaning can range between £20 and £200, depending on:

  • The number of panels to be cleaned
  • The level of cleaning needed
  • Your property’s location
  • Whether they charge per job or per panel

How often do solar panels need to be cleaned?

Solar panels usually need to be cleaned once or twice a year to keep them working as efficiently as possible. However, this depends on things like:

  • Your local environment: If you live in a dry, dusty, or coastal area, your panels may need cleaning more often to remove salt or dust build-up over time.
  • Nearby wildlife: If your panels are close to trees or bird nests, you should regularly clear off any fallen leaves or animal droppings.
  • Rainfall levels: If you live somewhere prone to rain, your solar panels will be naturally rinsed of debris more often, meaning less manual cleaning is required.

Get more from your solar panels with battery storage

Looking after your solar panels is the best way to protect your investment and keep them performing at their best. Whether you already have a system in place or you’re planning a new solar panel installation, the team at Grant Store is here to help you get the most from it for decades to come. Speak to our MCS-certified solar experts today for friendly advice on maintaining your panels or to explore what the right solar panel installation could do for your home.

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Frequently asked questions

What happens if you don’t clean your solar panels?

If you don’t clean your solar panels, dirt, dust, and debris can build up over time, blocking the sunlight needed to generate electricity. Not only does this make your solar panel installation less efficient, but it can also increase the rate of degradation in your panels and shorten their overall lifespan.

What not to do when cleaning solar panels?

When cleaning solar panels, never stand on the panels, use harsh chemicals, or spray them with a pressure washer. It’s also good to avoid cleaning in direct sunlight with cold water, as this can cause thermal shock and damage the glass. Always follow your solar system’s maintenance manual for safe cleaning.

Do solar panels self-clean?

Many solar panels come with self-cleaning glass or coatings that reduce dirt build-up, especially in rainy climates. However, these features don’t completely remove the need for regular checks and maintenance.

Can you wash solar panels with a pressure washer?

No, you should not wash solar panels with a pressure washer, as the high pressure can damage seals, wiring, and the PV panel surface itself. Use lukewarm water, a microfibre cloth, or soft cleaning tools to clean your solar panels.

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