Solar panel cleaning and maintenance

You take your car to get serviced each year. Should you also have someone inspect your solar panel system each year? How much does dirt affect the performance of solar panels and should you get them cleaned. Salesmen in the solar industry will often play down the requirement for maintenance and exclude it altogether from a business case. This article gives you an idea of what will be required.

 

What are the requirements for solar panel maintenance?

Good quality solar power systems that have been installed by experienced electricians and designed to operate with low maintenance requirements through-out their lifetime. However, like any live electrical asset, it makes sense to have a qualified electrician periodically inspect the components of the system to ensure:

  • The system is performing as designed
  • No factors are prohibiting or undermining performance
  • All components are operating safely and are not at risk of failing or causing wider site damage.

Frequency of solar panel inspections

For small residential systems, we would recommend a full electrical inspection every couple of years. However, for larger commercial systems (over 40kW), it is recommended to have a scheduled maintenance inspection each year to ensure the system is operating optimally and safely.

Solar panel monitoring systems are a crucial element of your solar power system, providing insight into performance, issue diagnostics, and to identify if you need to take action earlier than scheduled.

 

Do you need to clean your solar panels?

Industrial particulate matter build up on solar panelsLike your roofing material, a solar panel will collect dirt, debris and other obstructions throughout their lifetime. In most areas of Australia, if your panels are installed at a tilt of 5 degrees or higher, heavy rainfall might be sufficient to clear much of the dirt from the panel and keep your system operating without material soiling losses.

The improvements in solar panel and inverter technology, such has cutting silicon cells in half or panel optimisers, have made them more resistant to shading and dirt build up. Through a solar panel system inspection, a qualified electrician can advise whether there is a need to clean the solar panels.

Panels installed flat on a roof, or subject to unusual conditions like large local bird populations, industrial area pollution or near coast areas will need to be cleaned more regularly.

 

Regular vs Reactive Maintenance

There are different approaches you can take to managing your solar panel system. Often larger commercial projects and those who operate multiple sites will engage a contractor to provide a regular inspection and monitoring service. This enables faults and potential risks to be identified and resolved pro-actively and minimise any damage to the system.

Many businesses choose to engage a maintenance contractor or call their installer when it is identified that something goes wrong. The free monitoring software that comes with good quality inverters can identify some faults and issues in the system and some even have the ability to send an email to the owner if an error is triggered. In our experience, we find that many underperforming or failing solar systems go unnoticed.

 

What do Solar Panel Warranties cover?

A solar panel product warranty covers manufacturing defects. Solar panel defects usually require a qualified electrician to identify, document and raise with the product manufacturer. If your installer is no longer around, you bought a cheap solar system off a company that doesn’t provide a good service capability, or you would like independent advice, then Solar Choice can help you find a local solar maintenance company to help you diagnose and resolve the issues with your system.

If it can be demonstrated that a solar panel is not generating the expected output then, in theory, you can make a claim. In practice, these claims are usually only made on utility scale projects where they have expert equipment that can measure local sunlight and prove that a solar panel is underperforming.

For these reasons, it is important to pick a reputable solar panel manufacturer with a local office and presence in Australia.

 

Can solar panels withstand hail and extreme weather patterns?

Solar panel hail damageSolar systems are designed and rated for the environments in which they are installed. A solar installer will ensure that the mounting system and roof substructure is designed to meet the wind-rating and survive the usual and unusual weather patterns that occur in your locality.

All solar panels are designed and tested to be able to withstand ice up to 35mm (golf ball) in order to be approved by Australian Standards. That covers 99% of weather patterns. In rare circumstances, areas in Australia can get bigger hailstorms (i.e. when car windscreens get smashed).

The solar panels can be covered from hail damage by building insurance. You may need to talk to the insurer to confirm its covered. If this is a major concern then I would recommend ‘glass on glass’ panels which have a tempered glass backsheet instead of a thin film. These are stronger panels and will withstand much heavier hail – they cost about 20% more than typical solar panels.

 

What common problems occur with solar panel systems?

  1. Wiring and Component issues

DC Isolator switch on solar panel system burnt outRegulations in Australia require a DC isolator (a switch which turns off the solar panels) to be located on the roof. Inevitably this is one of the components that eventually perishes under UV light, overheating or water penetration. As with any system, there can also be issues with any of the wiring, connections and workmanship of the electricians who completed the job.

  1. Solar Inverter Faults

As a major component of the system, inverters are prone to failure. Inverters can repeatably ‘trip off’ if there are voltage issues onsite or within the solar system itself, dust can collect, affecting the inverter’s temperature and overall performance or communication issues can inhibit your ability to monitor their generation.

  1. Hot Spots

Solar panel hot spotHot spots are among the most common issues and occur when panels get too hot or the circuits are overloaded. This can be triggered in some cases by the build up of dirt on a solar panel surface. They can also occur from a manufacturing fault such as a bad electrical connections.

  1. Micro-Cracks

Micro-cracks normally occur from mishandling in shipping/transport or applying too much pressure to the tempered glass during installation. These crack can start so small they are not noticeable to the naked eye but increase over time with water ingress and temperature changes

  1. Snail Trails

Solar panel snail trailAs the name suggests, this common solar panel problems presents a darkened line across the surface of the panel that appears like a ‘snail trail’. These problems can occur where moisture is able to get inside the solar panel through the use of defective silver paste. Snail trails cause solar panels to produce lower outputs and shorten their expected lifespan.

 

How much does solar maintenance and solar panel cleaning cost?

The below table provides an indicative guide for the costs of maintaining your solar system. Please note these figures depend on several factors which are listed below the table.

 6.6kW50kW99kW500kW
Basic Inspection$250$650$850$1,100
Detailed Inspection (inclusive of electrical testing)$400$1,000$1,350$2,900
Solar Panel Cleaning$12/panel$7/panel$5/panel$4/panel

 

The costs you will get quoted for your site will depend on a number of factors:

  • Location
  • Roof Access – it is safe to access roof without hiring additional equipment like scissor lifts
  • Solar system design
  • How many solar panels are installed
  • Age of the solar system

 

How can I tell if my solar power system is performing well?

Solar monitoring dashboard outputUsually the performance of your solar power system can be identified in 2 ways. Firstly, you can review the monitoring system that comes with the solar system. All solar inverters have free solar monitoring software that you should be able to access once your inverter is connected to the internet. You may need to contact your solar installer or solar panel inverter manufacturer to get that set up if you do not have access.

This software will usually provide an overview of how much solar power is being generated and some history of how the system has performed. You can then compare this against the estimates that you have been provided to you in the original solar proposal.

The other way in which you can observe the impact of your solar power system is through your energy bills. Your energy bills do not record how much solar power was generated, but shows the lower figure of energy that you are now buying from your retailer, and details any exported solar energy. This is not the complete picture, but if you understand your energy consumption well, then an unusually high bill (pending your rates are the same) may suggest there are some issues with your solar panel system.

 

How to replace a solar panel or inverter if they are faulty?

Solar power equipment should always be handled and replaced by a Clean Energy Council qualified electrician. If you intend to claim a warranty, then typically solar panel manufacturers will look for evidence of the fault supplied by an electrician.

If you are not replacing a solar panel with the same model from the same manufacturer, care should be taken to ensure that the solar panel replacement meets the same specifications as the other solar panels installed in the array, otherwise it could bring down the performance of the whole system.

 

Conclusion

Solar panel systems are valuable assets that have an expected life of 25 years. In order to optimise your return on investment, we recommend you take up a maintenance plan.

Ideally it would include a regular health check for the system from a qualified electrician to pro-actively identify any issues and preserve the value of the asset, but could also include regularly checking of the monitoring software of the system, and reactively resolve issues onsite as and when they arise.

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