How long do solar panels last?
25 to 30 years, easily.
Most panels still produce well past their warranty, just at a slightly lower rate. The inverter usually needs replacing around year 10 to 15.
Checked Sep 9
What kind of system do you have?
Why?
Degradation is slow Most panels lose less than 0.5% output per year, so they're still useful after 30 years.
Warranty is a floor Manufacturers guarantee at least 80% output at 25 years, and panels usually outlast that.
Inverter is the weak link String inverters often fail around 10 to 15 years; microinverters can last longer but cost more.
Harsh climates or poor installation can shorten life, but that's the exception.
If your situation is different
What kind of system do you have: Standard panels. 25 to 30 years, easily. They degrade about 0.5% a year, so after 30 years you're still at 85% output.
What kind of system do you have: Premium panels. 30 years or more. Higher-end panels often have 30-year warranties and slower degradation.
What kind of system do you have: With battery. Panels last, battery doesn't. Batteries typically need replacing every 10 to 15 years, so factor that in.
Who is a solar panel system right for?
Right for
- Homeowners with high electric bills
- People planning to stay 10+ years
- Those with good sun exposure on roof
- Anyone wanting to cut carbon footprint
Wrong for
- Renters or frequent movers
- Homes with heavy shade or old roofs
- Those with low electricity usage
- People who can't afford upfront costs
What does a solar panel system cost in 2026?
| Figure | Value | Why it matters |
|---|---|---|
| Average system cost | $20,000 to $30,000 before incentives, 2026 | Typical 6 to 8 kW system; federal tax credit can cut 30%. |
| Payback period | 7 to 12 years, 2026 | Depends on electricity rates and sun; after that, power is nearly free. |
| Degradation rate | 0.5% per year, typical | After 25 years, panels still produce about 88% of original output. |
| Inverter replacement cost | $1,000 to $3,000, 2026 | String inverters need replacing around year 10 to 15; budget for it. |
| Warranty coverage | 25 years, typical | Most manufacturers guarantee at least 80% output at 25 years. |
What's the biggest solar panel mistake?
The biggest mistake is buying panels without checking your roof's age and condition. If your roof needs replacing in the next 10 years, you'll pay to remove and reinstall the panels, which can cost thousands. Instead, replace the roof first or factor that cost into your decision.
How do you decide if solar panels are worth it?
- Check your roof's age and condition; if it's over 15 years old, plan for a replacement.
- Get quotes from at least three installers and compare price per watt.
- Calculate your payback period using your actual electric bill and local rates.
- Confirm your inverter warranty and replacement cost before signing.
People also ask
How much does a new inverter cost?
$1,500 to $3,500 installed, parts and labor. That's the typical range for a string inverter on a home solar system. Microinverters run higher, and the exact price depends on size and brand.
What's the payback period?
Usually 7 to 12 years. That's for a typical rooftop system with net metering. Your actual number depends on electricity rates, sun exposure, and incentives.
Do they need maintenance?
Yes, but it's light. A couple hours a year keeps them producing at peak. Mostly you're hosing them off and watching the app.
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