Questions to Ask Solar Companies About Maintenance and Performance

A solar array is a decades-long investment, and how a company handles maintenance and support after installation matters as much as the installation itself. Dust, seasonal air quality, and normal wear can all affect performance over time, so before you sign with a provider it is worth asking pointed questions about upkeep, cleaning, and what happens if something goes wrong. The answers tell you a great deal about whether a company stands behind its work.

Do solar panels actually need cleaning?

Yes. Cleaning helps maintain optimal output, and the process is not unlike washing a car. Avoid cleaning during the hottest part of the day, since a sudden burst of cool water on hot glass can stress the panel. Early morning is typically the best window.

• Rinse the panels with a hose first to remove loose debris.
• Use a gentle, diluted dish detergent with a soft sponge or microfiber cloth.
• Finish with a thorough rinse and avoid abrasive materials that can scratch the surface.
• Check your module manufacturer's guidelines for any system-specific recommendations.

How often should cleaning happen?

We generally recommend cleaning panels once or twice a year to prevent buildup. Homes in areas with higher dust levels, or near active construction, may benefit from more frequent attention. Good natural checkpoints are the start of summer and the period right after fire season, when ash and particulate can settle on rooftops.

Can Xero Solar clean my panels for me?

No. Xero Solar does not offer panel cleaning as a service. We recommend hiring a professional to handle this work safely and effectively. Local window washing companies frequently offer solar cleaning as well, so it is worth calling around in your area to confirm availability and pricing.

What support should you expect if something underperforms?

Before you sign a contract, ask what happens if your system underperforms or needs repair. Find out about service hours, typical response times, and whether you will deal directly with the installer's own team or get routed to a third-party subcontractor. A company that answers these questions clearly and specifically, rather than in vague terms, is generally one you can rely on years down the road.

A system that is well designed and well maintained should keep performing at a high level for decades. The maintenance conversation you have before installation sets the tone for every year that follows.

What ongoing maintenance should you plan for?

Solar systems generally require minimal upkeep, but periodic inspections and monitoring are still worthwhile. Your module manufacturer can offer guidance specific to your equipment, and your installer should be able to walk you through what monitoring data to watch and what would signal a problem worth investigating.

Putting it together before you sign

Asking the right questions about maintenance and performance before installation helps protect your investment for the long run. If you are still comparing providers, it is also worth reviewing our companion piece on questions to ask before a residential solar installation and our breakdown of financial considerations for homeowners. For homeowners ready to talk specifics, our residential solar team can walk through what ongoing support looks like for your home, or you can reach out directly to get started.

Frequently asked questions

Do solar panels need regular cleaning?

Yes. Dust, pollen, and debris can reduce output over time. Most Southern California homes benefit from cleaning once or twice a year, though homes in dusty areas or near construction may need it more often.

Can Xero Solar clean my panels?

No. Xero Solar does not offer panel cleaning services. We recommend hiring a qualified local professional, such as a window washing company that offers solar cleaning, to do this work safely.

What is the best time of day to clean solar panels?

Early morning is best. Cleaning during the hottest part of the day can cause rapid temperature changes that stress the glass, so it is worth avoiding midday cleaning whenever possible.

What should I ask about ongoing support before signing a contract?

Ask about service hours, expected response times, and whether you will be working directly with the installer's team or referred to a third party if something goes wrong.

How much maintenance do solar systems require overall?

Solar systems are designed to be durable and low maintenance. Periodic inspections, monitoring, and occasional panel cleaning are generally all that is required for consistent performance.