Solar Inverter Replacement Cost UK: 2026 Prices & Guide
Has your solar inverter failed, started showing error codes or stopped recording normal generation? The inverter is a critical part of a solar PV system and may need replacing before the solar panels themselves reach the end of their useful life.
How Much Does It Cost to Replace a Solar Inverter?
A typical UK domestic solar inverter replacement can cost approximately £500 to £1,500 installed in 2026, although larger, specialist or more complicated systems can cost more.
A straightforward like-for-like string inverter replacement is generally towards the lower end of the market. Upgrading to a hybrid inverter that can work with battery storage usually costs more.
Solar Inverter Replacement Costs at a Glance
| Replacement Type | Indicative 2026 Cost | Typical Situation |
|---|---|---|
| Standard string inverter | Approx. £500–£1,200 | Common domestic solar PV systems requiring a straightforward replacement. |
| Larger / specialist string inverter | Approx. £800–£1,500+ | Larger arrays or systems needing more specialised equipment. |
| Hybrid inverter | Approx. £1,200–£2,500+ | Replacement or upgrade where battery compatibility is required. |
| Microinverter | Approx. £150–£350 per unit | Systems using individual panel-level microinverters. |
| Diagnosis / inspection | Often around £80–£200 | Where the cause of poor generation or failure is not yet known. |
What Does a Solar Inverter Actually Do?
Solar panels generate direct current electricity. Your home and the electricity grid use alternating current, so the inverter converts the electricity produced by the panels into a form that can be used by household appliances or exported.
That means a perfectly healthy set of solar panels can produce little or no usable electricity for the property if the main inverter has failed.
This is why inverter replacement should be considered as part of the long-term cost of owning solar rather than assuming the original installation price is the only significant expense.
See our solar panel maintenance and ownership costs guide for the wider lifetime costs of a solar PV system.
Signs Your Solar Inverter May Be Failing
No Solar Generation
If monitoring shows no generation during bright daylight, the inverter or another part of the system may have developed a fault.
Error Codes
Modern inverters usually display or record fault codes. The manufacturer's documentation can help identify what a particular code means.
Warning Lights
Red or amber warning lights can indicate a fault, although the meaning varies between manufacturers and models.
Repeated Shutdowns
An inverter that repeatedly stops and restarts may need investigation rather than simply being reset indefinitely.
Falling Generation
An unexplained reduction in output compared with similar previous periods can justify a system check.
Unusual Noise or Heat
Unexpected noise, overheating or visible damage should be assessed rather than ignored.
How Long Does a Solar Inverter Last?
A traditional string inverter is commonly expected to operate for around 10 to 15 years, although actual lifespan varies by equipment, installation conditions and use.
Solar panels themselves can remain operational considerably longer. This means a homeowner may need to replace an inverter during the working life of the original panels.
For households that installed solar during the earlier UK solar boom, inverter replacement is therefore becoming an increasingly relevant ownership cost.
What Affects Solar Inverter Replacement Cost?
Inverter Size
Larger solar systems generally require higher-capacity equipment, which can increase the replacement price.
Inverter Type
String, hybrid and microinverter systems work differently and have different replacement costs.
Brand & Compatibility
The replacement needs to be suitable for the existing array and electrical configuration. Older or discontinued equipment can make this more complicated.
Electrical Work
Changes to isolators, cabling, protection equipment or other components can increase labour and material costs.
Location & Access
Most central inverters are relatively accessible, but microinverters and other roof-mounted components can create additional access costs.
Upgrade Rather Than Replace
Moving from an older string inverter to a hybrid system can cost more but may prepare the property for battery storage.
Should I Repair or Replace My Solar Inverter?
A fault does not automatically mean the inverter needs replacing. A professional diagnosis may identify another problem or a repairable fault.
The age of the inverter matters. Repairing a relatively young unit may make sense where parts and technical support remain available. For an older inverter approaching the end of its expected life, replacement may sometimes be more practical than investing heavily in a repair.
Before paying for either option, check:
- the inverter manufacturer's warranty;
- your original installer warranty;
- the exact fault code or diagnosis;
- whether replacement parts are still available;
- the cost difference between repair and replacement; and
- whether you expect to add battery storage later.
Should You Upgrade to a Hybrid Inverter?
An inverter failure can create an opportunity to reconsider how the solar system is configured rather than automatically installing an identical type of replacement.
A hybrid inverter can manage solar generation while also supporting compatible battery storage. This may be useful if you are planning to add a home battery, but paying more for hybrid capability that you will never use would provide little benefit.
Before upgrading, compare the additional cost against your actual plans for battery storage and make sure the proposed equipment is compatible with the existing solar array.
For battery pricing, see our home battery storage cost UK guide and our guide to solar panels with battery costs.
What If the Original Solar Installer Has Gone Bust?
Older solar systems may have been installed by businesses that no longer trade. That does not necessarily mean the entire solar array needs replacing when the inverter fails.
Another competent solar contractor may be able to diagnose the existing system and specify a suitable replacement inverter.
However, check your paperwork first. Manufacturer warranties, insurance-backed cover or other protection may exist independently of the original installer.
This subject becomes particularly important with older solar installations, and SolarCostsUK is developing a separate section covering legacy solar agreements, installer failures and ownership issues.
What About Feed-in Tariff Solar Systems?
Many older UK solar installations still receive Feed-in Tariff payments. If your inverter needs replacing, keep accurate records of the original and replacement equipment and seek appropriate advice about any notification or documentation requirements that apply to your particular system.
A replacement should also be correctly sized and configured for the existing installation rather than assuming that fitting a more powerful inverter is automatically beneficial.
Can a New Inverter Improve Solar Performance?
Replacing a failed inverter should restore normal conversion of electricity where the inverter was the cause of the problem.
That does not mean a new inverter magically increases the generating capacity of the solar panels. Panel size, orientation, shading, weather and the design of the array still determine how much solar electricity is available.
If generation has dropped, obtain a proper diagnosis before replacing expensive equipment unnecessarily.
Budget for the Whole Life of Your Solar System
An inverter replacement is one of the clearest examples of why solar should be assessed using lifetime costs rather than installation price alone.
If you are considering a new system, compare equipment warranties, inverter specifications and expected replacement costs alongside the initial quotation.
Start with our solar panel costs UK guide, or use our solar panel payback calculator to explore the longer-term economics.
Solar Inverter Replacement FAQs
How much does a solar inverter replacement cost in the UK?
A standard domestic solar inverter replacement commonly costs approximately £500–£1,500 installed in 2026. Larger systems, specialist equipment and hybrid inverter upgrades can cost more.
How long does a solar inverter last?
Traditional string inverters are commonly expected to last around 10–15 years, although individual units may fail earlier or operate for longer.
Do I need to replace my solar panels when the inverter fails?
Not normally. If the panels and the rest of the system remain in good condition, a failed inverter can often be replaced without replacing the solar panels.
Can I use a different inverter brand?
Potentially, but the replacement must be technically compatible with the existing solar array and system design. A competent installer should specify appropriate equipment.
Should I replace my inverter with a hybrid inverter?
It can be worth considering if you genuinely plan to add compatible battery storage. Compare the additional cost and technical requirements before choosing an upgrade rather than a like-for-like replacement.
What if my original solar company has closed down?
Another solar professional may still be able to diagnose and repair the system. Check manufacturer warranties and your original paperwork before paying for replacement equipment.