How long do solar panel systems last?
Most solar panel systems last 25 to 30 years. Panels commonly carry 25-year performance warranties, and many keep producing past that. Inverters are replaced sooner, commonly around 10 to 15 years for string models.
Solar panels last far longer than most things in the house, but a system is more than panels. The inverter usually needs replacing sooner, and production data is how you notice a fault before the next utility bill does.
Typical lifespan: 25 to 30 years
Panels commonly carry 25-year performance warranties, and many keep producing past that. Inverters are replaced sooner, commonly around 10 to 15 years for string models.
Solar panel system maintenance checklist by season
Spring
Look at the array from the ground or with binoculars for debris, bird nests, shading from new tree growth, or damaged panels. Compare spring output with the same month last year.
Summer
Check the inverter status light or app for faults. Rain usually does enough cleaning; if you clean, follow the installer's guidance and do not walk on the roof.
Fall
Trim back branches that now shade the array. Check the output after leaf fall and before shorter days, and keep the monitoring gateway powered and on Wi-Fi.
Winter
Snow usually slides off. Do not climb or scrape panels. Low winter output is normal, but a sudden drop compared with a similar month last year is worth a call to the installer.
Signs your solar panel system needs replacing
- Production drops noticeably compared with a similar month, with no change in weather or shade.
- The inverter shows a fault light or error code, or has stopped communicating.
- Visible cracks, discoloration or loose panels or wiring.
- The inverter is past about 10 to 15 years, which is when a string inverter is commonly replaced.
- Your monitoring has stopped reporting.
Typical solar panel system warranty
Product warranties on panels are commonly 10 to 25 years, with a separate performance guarantee that is often around 25 years. Inverters commonly carry 10 to 12 years on string models, with longer terms on some microinverters. Installer workmanship warranties are separate. Read your contract for what is covered.
An appliance warranty tracker keeps your solar panel system's coverage dates and receipt in one place.
What to keep for a solar panel system
- The installation contract and warranty documents for panels, inverter and workmanship
- Serial numbers for the panels and inverter
- The permit, interconnection agreement and inspection sign-off
- Monthly production records you can compare year to year
Common questions
How long do solar panel systems last?
Most solar panel systems last 25 to 30 years. Panels commonly carry 25-year performance warranties, and many keep producing past that. Inverters are replaced sooner, commonly around 10 to 15 years for string models.
How do I know if my solar panels are working properly?
Compare monthly production with the same month last year, and check the inverter status. A sudden drop with no weather change is worth investigating with your installer.
How much could solar save me?
It depends on your electricity price, sun hours and system size. The Pamkit solar savings tool gives a rough estimate from your ZIP, and your installer's quote is the real figure.
How do I maintain a solar panel system?
Follow your manual first. Each season: spring, look at the array from the ground or with binoculars for debris, bird nests, shading from new tree growth, or damaged panels. Compare spring output with the same month last year. Fall, trim back branches that now shade the array. Check the output after leaf fall and before shorter days, and keep the monitoring gateway powered and on Wi-Fi.