How long does a solar inverter last, and what does replacing it cost?
1 min read · Updated 15 October 2026
The short answer
Most string inverters last 10 to 15 years, well short of the panels. Replacement typically costs £500 to £1,500 fitted, depending on size and type.
Signs it's failing
Error codes, no display, a fan running hard, or generation dropping to zero on a sunny day.
Repair or replace
Older inverters are rarely worth repairing. A replacement may also be a chance to add battery compatibility.
Planning for it
Inverter failure is the most common solar fault, and it tends to land between years 5 and 12.
On cover: Solar panel insurance: what does it cover, and do you need it?
Want someone else to look after it?
Annual service, monitoring and repairs, any make.