Solar Maintenance & Repairs — Keep Your System Performing
A solar panel system is a long-term investment, and like any investment, it needs proper care to deliver its full potential. Studies show that poorly maintained solar systems can lose 15–25% of their generation capacity over time due to soiling, shading, inverter issues and wiring degradation.
GL Solar provides comprehensive solar maintenance and repair services across Cardiff and South Wales. Whether you need an annual service, a fault diagnosis, an inverter repair or a full system health check, our experienced team is on hand to keep your solar system generating at its best.
We service and repair all makes and models of solar panels, inverters and battery systems — not just systems we've installed. If your system isn't performing as expected, contact us for a fast diagnosis and repair.
What's Included
Annual System Health Check
Comprehensive inspection of panels, inverter, wiring, mounting and performance data.
Fault Diagnosis
Fast diagnosis of underperformance, faults and error codes across all brands.
Inverter Servicing
Inverter inspection, firmware updates and performance optimisation.
Repair Service
Fast repairs for all solar system faults — panels, inverters, wiring and mounting.
Performance Monitoring Review
Analysis of your monitoring data to identify underperformance and optimise generation.
Service Report
Detailed written report after every service visit for your records.
Our Process
Book a Service
Contact our Cardiff team to book your annual service or report a fault.
Performance Review
We review your monitoring data before the visit to identify any issues in advance.
On-Site Inspection
Our engineer inspects your panels, inverter, wiring, mounting and all system components.
Fault Diagnosis & Repair
Any faults are diagnosed and repaired on the spot where possible, or a repair plan is provided.
Performance Optimisation
We optimise your inverter settings and monitoring configuration for maximum generation.
Service Report
You receive a detailed written report covering all findings, work carried out and recommendations.
Why Choose GL Solar Cardiff?
All Brands Serviced
We service and repair all makes and models — not just systems we've installed.
Cardiff Based
Local team with fast response times across Cardiff and South Wales.
Qualified Electricians
All maintenance and repairs carried out by NAPIT-approved electricians.
Detailed Reports
Written service reports after every visit for your records and warranty.
“Our solar system was installed by another company and wasn't performing well. GL Solar came out, diagnosed a faulty inverter and a shading issue we didn't know about. They fixed everything quickly and our generation is now 25% higher than before. Brilliant service.”
Frequently Asked Questions
Areas We Cover in Cardiff & South Wales
GL Solar provides Solar Maintenance & Repairs services across Cardiff and the wider South Wales region. Whether you're in the city centre or the surrounding valleys, our local team is ready to help.