Quick answer
Modern solar panels carry a 25-year manufacturer warranty on output (typically guaranteeing 80%+ of original output at year 25) and physically last 30-40+ years. Inverters have a shorter life — typically 12-15 years — and need one replacement during the system lifetime. Total system economic life: 25-35 years.
Full answer
Solar panel warranties have two components: product warranty (typically 12-25 years against manufacturing defects) and performance warranty (typically 25 years guaranteeing minimum output, usually 80-85% of original kWp). Tier 1 manufacturers like REC, Q CELLS, SunPower, Trina, JA Solar all provide 25-year performance warranties as standard.
Real-world panel performance: documented installations from the 1980s and 1990s are still generating useful power 35-40 years later, typically at 70-80% of original output. Lifetime degradation is gradual and predictable; sudden catastrophic failure is extremely rare in modern monocrystalline panels.
Inverters are the principal mid-life replacement. Modern string inverters carry 10-12 year manufacturer warranties; typical real-world life is 12-15 years before failure or efficiency decline triggers replacement. Microinverters (one per panel) typically last longer (15-20 years) but cost more upfront.
Other components: mounting systems are typically aluminium or galvanised steel with 25-30+ year life. Cables and connectors are MC4-standard with similar life expectancy. DC isolators and AC switchgear have 20-25 year life. Monitoring systems typically need software updates every 5-7 years and may need hardware replacement at year 12-15.
Related questions
- How much maintenance do church solar panels need?
- What happens if a panel fails?
- Do panels work in shade or rain?
- When do we need to replace the inverter?