Has your solar panel system stopped delivering the savings you expected?
Are your energy bills creeping up - even on sunny days?
If your solar PV system isn’t working like it used to, it may be time for a professional check-up.
Solar panels are built to last decades, but like any energy system, they can suffer from wear and tear, reduced efficiency, or hidden faults over time.
In this article, we’ll explain why performance drops happen, what signs to look out for, and how a professional solar service from Fit Solar can get your system back on track.
Why Solar Panels Lose Efficiency Over Time
Solar PV systems are incredibly reliable, but a few key factors can cause their performance to drop over the years:
1. Dirt and Debris Build-Up
Dust, moss, bird droppings, and other grime can block sunlight and reduce output.
2. Panel Degradation
Solar panels degrade slowly, typically 0.5–1% per year but poor conditions can speed this up.
3. Inverter Wear or Failure
Your inverter works harder than any other part of your system and may need replacing after 10–15 years.
4. Wiring or Connection Issues
Loose connections, water ingress, or animal interference can all impact performance and safety.
If left unaddressed, these issues can seriously affect your energy savings especially as electricity prices continue to rise.
How to Spot a Failing Solar System
You may not immediately notice a problem with your panels, but here are some common signs of a system that's underperforming:
- Higher-than-expected electricity bills
- Inverter showing a red light or error code
- Your smart meter or monitoring app shows low/no generation
- Buzzing or humming sounds from your inverter or fuse box
- Visual signs of dirt, shading, or damage to your panels
If your system used to work well but now seems sluggish, don’t ignore it book a professional inspection to find out what’s going wrong.
Book a Solar PV Check-Up with Fit Solar
At Fit Solar, we offer expert Solar PV Servicing and Maintenance across the Cotswolds and surrounding areas.
Our certified technicians can:
- Inspect your system for visible faults and wear
- Test all key components, including your inverter and wiring
- Clean your panels if needed
- Provide honest recommendations on repairs or upgrades
Even if we didn’t install your system, we’re happy to help. We service all solar panel setups, regardless of make, model, or installer.
Need help right away? Contact us today to schedule your check-up or speak with one of our experts.
Should I Upgrade My Solar Panels Instead?
If your system is older or no longer meeting your household’s energy needs, you might benefit from an upgrade.
Modern solar panels are more efficient, and you can also add battery storage, expand your system, or replace a worn-out inverter. Learn more about your options in our guide:
Can You Upgrade Existing Solar Panels?
We’ll assess your current system and help you decide whether a service, partial upgrade, or full system revamp is right for you.
Will Fixing My Solar Panels Add Value to My Home?
Yes—maintaining and improving your solar system can increase your property’s energy efficiency and resale value. In fact, homes with working solar panels often sell faster and for more money.
Read our full guide here:
Do Solar Panels Increase Home Value? (UK Guide)
Don’t Let a Faulty System Drain Your Savings
If your solar panels aren’t working like they used to, don’t wait until it becomes a costly problem.
A professional check-up can restore lost efficiency, identify hidden faults, and protect your long-term savings.
With Fit Solar, you get local expertise, fast diagnostics, and honest advice whether you need a simple fix, a system upgrade, or peace of mind.
