The essentials in 30 seconds
Solar panels on a house typically last 25 years or more. The US Department of Energy says crystalline silicon modules, the type almost all homes use, reach life spans of 25+ years with power degradation of less than 1% a year. The US EPA says panels typically have a lifespan of more than 25 years, and the Energy Saving Trust says they should last 25 years or more. The part that usually needs replacing first is the inverter: the Energy Saving Trust says after around 12 years. Panels do not suddenly stop at 25 years; they gradually produce a little less.
- Most inverters have a warranty of at least five years, often extendable to 15.
- Keep trees trimmed and follow your installer's maintenance checks.
- At the end of their life, panels must be recycled or disposed of under waste rules.
How long do solar panels last on a house?
| Part | How long it lasts | Source |
|---|---|---|
| Solar panels (crystalline silicon) | 25 years or more | US DOE; US EPA; Energy Saving Trust |
| Panel output | Falls by less than 1% a year | US DOE |
| Inverter | Replace after around 12 years | Energy Saving Trust |
| Inverter warranty | Usually at least 5 years, often extendable to 15 | Energy Saving Trust |
How much power do panels lose each year?
Panels age slowly. The DOE puts the power loss of crystalline silicon modules at less than 1% a year. As a simple calculation, a panel losing just under 1% a year would still produce more than three-quarters of its original output after 25 years. That is why panels often keep working past the 25-year mark. They simply generate a little less each year.
When do you need to replace the inverter?
The inverter converts the direct current (DC) from the panels into the alternating current (AC) your home uses. The Energy Saving Trust says you will need to replace it after around 12 years, so budget for it during the life of the panels. Some inverters have online monitoring and can warn you by email if the system fails. Most come with a warranty of at least five years, which can often be extended to up to 15 years. The Energy Saving Trust notes that a 15-year warranty can cost almost as much as a replacement inverter, so weigh it carefully and ask your installer about the inverter's likely lifespan.
How to make solar panels last
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01
Keep shade down
Trim nearby trees to keep shading to a minimum.
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02
Let the rain clean them
In the UK, the Energy Saving Trust says rain cleans panels tilted at 15 degrees or more.
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03
Clean only when needed
Ground-mounted panels and dusty areas may need occasional cleaning. Use a professional for panels on a roof.
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04
Follow your installer's checks
Your installer should leave written maintenance checks, the main inverter fault signals and basic troubleshooting.
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05
Watch the output
If your monitoring or inverter shows a fault or a sudden drop, contact your installer.
How often do solar panels need to be replaced?
Not often. With a lifespan of 25 years or more, most homes will replace the inverter once or more before they replace the panels. Ask an installer to check the system if production drops suddenly or a panel is damaged.
What happens to old solar panels?
When panels reach the end of their life, they become waste that must be managed safely. In the US, the EPA explains that some end-of-life panels contain enough metals to count as hazardous waste, and then federal rules (RCRA) apply to their recycling or disposal. The EPA has started a rulemaking to add solar panels to the simpler universal waste rules, and some states have their own end-of-life rules. Ask your installer or local waste authority how to recycle old panels where you live.
How long do solar panels last: frequently asked questions
How long do solar panels last?
25 years or more, according to the US Department of Energy, the US EPA and the Energy Saving Trust.
Do solar panels stop working after 25 years?
No. They gradually produce less. The DOE puts the loss at under 1% a year, so a panel still produces most of its original output after 25 years.
How long does a solar inverter last?
The Energy Saving Trust says you need to replace it after around 12 years.
How often do solar panels need to be replaced?
Rarely: the panels last 25 years or more. The inverter usually needs replacing sooner.
Do solar panels need maintenance?
Very little: keep trees trimmed, let the rain clean tilted panels and follow your installer's checks. Leave any roof work to a professional.
What happens to solar panels at the end of their life?
They must be recycled or disposed of under waste rules. In the US some panels count as hazardous waste, and some states have their own rules.
Sources
Official sources, checked on 2 November 2026 (02/11/2026).
- US Department of Energy · Crystalline silicon photovoltaics research ↗Crystalline silicon modules reach life spans of 25+ years and power degradation of less than 1% a year. Read in the browser.
- US EPA · End-of-life solar panels: regulations and management ↗Panels typically have a lifespan of more than 25 years; some end-of-life panels are hazardous waste under RCRA; rulemaking to add solar panels to universal waste rules; state end-of-life policies.
- Energy Saving Trust · Solar panels: costs, savings and benefits explained ↗Panels should last 25 years or more; inverter replaced after around 12 years; online monitoring; inverter warranties of at least five years extendable to 15; trimming trees; rain cleaning at 15 degrees or more; occasional cleaning for ground-mounted panels and dusty areas; installer's written maintenance checks. Read in the browser.
Output dropping?
Check the inverter display or monitoring for a fault code and contact your installer before anyone goes on the roof.