Solar Inverter Replacement Cost UK 2026
Inverter replacement is the biggest single recurring cost across a solar system's 25-year life. Here is what it actually costs in 2026 and how we handle it.
Inverter replacement costs in 2026
Replacing a domestic solar inverter in 2026 costs £1,300-£2,400 fitted depending on size and whether the replacement is like-for-like (string-to-string) or an upgrade (string-to-hybrid). Most string inverters last 10-12 years; hybrid inverters slightly less.
When to replace, when to repair
Most inverter faults under warranty are repaired by the manufacturer's RMA process — we coordinate that for you. Common warrantied issues: communications card failure, isolated component failures, firmware-recoverable problems. Out-of-warranty repair is usually not economic above 8 years of age.
Upgrade or like-for-like?
For most domestic systems coming up for replacement in 2026, we recommend upgrading to a hybrid inverter even if you have no immediate battery plans. The £400-£700 premium pays back if you ever add a battery within the next 5 years. Hybrid inverters also have better warranty coverage and better firmware support.
FAQs
How do I know my inverter is failing?
Will I need a new MCS certificate?
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