How to clean and maintain your solar panels effectively

How do I clean and maintain my solar panels

‍‍Solar panel maintenance is generally straightforward. Most panels are made with toughened glass and are tilted at an angle, allowing rain to wash away much of the dust and dirt. Many solar panels these days also have a hydrophobic coating. While not exactly “self-cleaning”, this does reduce the ability for dirt to stick and helps rain wash away dirt, dust and bird poo.  

However, over time, pollen, bird droppings and grime can build up, especially in dry spells or near trees, reducing energy output.This means there may be times you’ll need to get the panels cleaned to maximise their efficiency. Just remember to:

1. Use soft equipment: a soft brush or a sponge with a long handle, and a hose with plain water, is usually all that’s needed

2. Avoid harsh chemicals: stick to water or a mild soap solution. Abrasive cleaners can damage the glass

3. Work safely: if the panels are on the roof, avoid climbing up yourself. Instead, hire a professional with the right safety gear

4. Clean in the early morning or late evening: This helps avoid streaks and prevents water from evaporating too quickly on hot surfaces

Regular visual inspections also help catch any damage or shading from nearby trees.

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How often should I clean my solar panels?

‍Cleaning solar panels once or twice a year is usually sufficient. However, the frequency depends on your environment:

• Urban areas: may need less frequent cleaning due to rain and less pollen

• Rural or coastal areas: may require more frequent checks due to salt spray, dust, or sea bird droppings

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When is the best time of year to clean my solar panels?

Many homeowners schedule a clean in spring after the winter buildup and again in late summer. This routine solar panel maintenance keeps your system efficient year-round. The ideal times are:

• Early spring: to clear away winter debris and ensure maximum performance during peak sun months.

• Late summer/early autumn: to remove accumulated dust, pollen and bird droppings before the shorter winter days.

Always avoid cleaning during high heat or direct midday sun, as this can cause water spots or streaks.

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How long can I expect my solar panels to last?

Solar panels are built to last for decades. Most high-quality panels come with a 25-year performance warranty and can continue to generate electricity well beyond that, often 30-40 years with only minor efficiency loss.

However, inverters and other components may require replacement earlier, typically every 10 to 15 years. Routine solar panel maintenance helps maximise their lifespan and your return on investment.

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What should I do to maintain my solar panels effectively?

Beyond cleaning, effective solar panel maintenance includes:

• Monitoring system output: use your solar monitoring app or inverter display to spot drops in performance

• Checking for shading: as trees grow or new structures are added nearby, shading can become an issue

• Inspecting wiring and mounting: look out for corrosion, loose fittings, or signs of damage, especially after storms

• Scheduling annual professional inspections: a qualified technician can perform a thorough check to ensure your system is in top condition

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Can solar panels be cleaned automatically?

Yes, automatic cleaning systems are available, though they’re more common in large commercial installations. These include:

• Sprinkler-style systems that rinse panels regularly

• Robotic cleaners that brush and wash panels without manual effort

For homeowners, these systems are usually unnecessary and costly for the scale of typical domestic setups. Manual cleaning or hiring a professional once or twice a year remains the most cost-effective solution for solar panel maintenance.

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In summary

Keeping your solar panels clean and well-maintained ensures optimal energy production and extends their lifespan. While modern panels are low maintenance, a little care goes a long way (which goes for many things in life!). With regular checks, biannual cleaning and professional support when needed, you can enjoy clean solar panels and efficient renewable energy for decades to come.

For more advice on solar panel maintenance and home energy savings, visit our Info Hub.

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