The Short Answer
Solar panels typically last 25-30+ years while still producing useful electricity. Most panels are warranted to produce at least 80-85% of their original output after 25 years, and many continue working well beyond that.
Other components have different lifespans:
- Panels: 25-30+ years
- String inverters: 10-15 years (may need one replacement)
- Microinverters: 20-25 years
- Batteries: 10-15 years
- Racking/mounting: 25+ years
Understanding Panel Degradation
What Degradation Means
Solar panels slowly lose efficiency over time—they produce slightly less power each year. This is called "degradation" and it's completely normal.
Degradation Rates
| Panel Type | Annual Degradation | Output After 25 Years |
|---|---|---|
| Standard monocrystalline | 0.5-0.7% per year | 82-87% of original |
| Premium (LG, Panasonic, etc.) | 0.25-0.4% per year | 88-94% of original |
| Older polycrystalline | 0.7-1.0% per year | 75-82% of original |
What This Looks Like in Practice
A 10kW system producing 14,000 kWh in year 1 would produce approximately:
- Year 10: 13,000-13,300 kWh (93-95% of original)
- Year 20: 12,000-12,600 kWh (86-90% of original)
- Year 25: 11,500-12,300 kWh (82-88% of original)
- Year 30: 10,900-11,900 kWh (78-85% of original)
Other System Components
Inverters
The inverter converts DC from panels to AC for your home. It's the most likely component to need replacement.
| Inverter Type | Expected Lifespan | Warranty |
|---|---|---|
| String inverter | 10-15 years | 10-12 years typically |
| Microinverter | 20-25 years | 25 years (Enphase) |
| Power optimizer + inverter | 15-25 years | 25 years (optimizers), 12 years (inverter) |
Budget for inverter replacement: If you have a string inverter, plan for a $1,500-$3,000 replacement around year 12-15.
Batteries
- Lifespan: 10-15 years typical
- Warranty: Usually 10 years or 70% capacity
- Degradation: Lose capacity over time like phone batteries
- Replacement cost: $8,000-$15,000 when the time comes
Racking and Wiring
- Mounting hardware: Aluminum and stainless steel last 25+ years
- Wiring: Should last the life of the system
- Roof penetrations: May need resealing every 10-15 years
Understanding Solar Warranties
Product Warranty (Equipment)
- Covers manufacturing defects
- Typical: 10-25 years depending on brand
- Premium brands often 25 years
Performance Warranty (Output)
- Guarantees minimum production level
- Typical: 80-85% output at year 25
- If panels underperform, manufacturer replaces them
Workmanship Warranty (Installation)
- Covers installation issues (leaks, wiring, mounting)
- From your installer, not manufacturer
- Typical: 5-25 years depending on installer
What Happens After 25 Years?
The Panels Keep Working
Your panels don't stop working at year 25. They continue producing power, just at a reduced rate. A system producing 10,000 kWh in year 1 might produce 8,000-8,500 kWh in year 30. That's still significant value.
Your Options at Year 25-30
| Option | When It Makes Sense |
|---|---|
| Keep using them | Still producing useful power, why remove? |
| Upgrade/replace | New panels are more efficient, want more power |
| Recycle | Panels are damaged, roof needs replacement |
| Sell home with system | Move on, let next owner decide |
Panel Recycling
When panels finally need disposal:
- Panels are ~80% recyclable (glass, aluminum, silicon)
- Dedicated solar recycling facilities exist
- Some manufacturers have take-back programs
- Recycling costs are currently $15-45 per panel
- Regulations may require manufacturer recycling in the future
Questions About Solar Longevity?
Wondering about warranties, degradation, or what to expect over time? Ask us anything about solar panel lifespan.
Ask About Lifespan