With most renewable energy, such as solar, it is only natural to wonder: how long will this last? Fortunately, solar PV systems are built to last for several decades. The bigger question is normally which parts wear out over time as the panels themselves are almost never what dies first.
So, how do solar power arrays grow older?
The vast majority of modern solar panels will still be generating electricity after 25-30 years (it is common for them to continue significantly longer). And they don’t just suddenly “stop” – usually each year there’s a little less that gets made.
A lot of panels come with a performance warranty that they will still produce at least x% of their original output after 25 years, and even more typically guarantee higher degradation standards within the first few years. For information on Solar Panel Installation Bristol, visit https://redbridgeandsons.co.uk/solar-pv-panels/solar-panel-installation-bristol/
What typically needs replacing first?
1) The Inverter
The inverter, however, does the heavy lifting; it converts the DC electricity from your panels into AC power that flows through your home.
Average life span: (possibly as long): 10 to 15 years.
Warning signs it might be giving out: error messages, nothing generated or inconsistent output.
When you hear people say “solar only lasts 10 years” the majority of time they are referring to an inverter – not typically panels.
2) Battery Storage (If Applicable)
While there may be some marginal benefits to trickle charging, the more significant consideration is that battery life will shorten faster than solar panels if cycled daily as they do.
Battery life: Usage dependent, with common 10-15 years per battery type.
The depth of discharge.
Temperature (3year vs 5 year warranty). How many cycles?
3) Monitoring
Typical life expectancy: varies with occasional replacement unit over 10-20 yrs
What usually doesn’t need replacing:
Properly installed, mounting systems are typically durable.
Cabling: this should last forever but if exposed or badly routed etc… it will need checking too.
How to increase system life
That being said, if the system was installed well to begin with it shouldn’t need too much maintenance, but good habits include:
Regularly reviewing your monitoring app to look for unexplained drops
Trim trees to minimise shading
If you see damage, loose panels or water ingress book an inspection.
The takeaway
A solar PV system is a long term asset. The inverter and or battery (if installed) on the other hand, are two parts that would need replacing but generally not for 25–30 years.