Solar Inverter Replacement Cost UK (2026 Guide)
A broken inverter means zero energy generation. Here is a transparent look at what you should expect to pay to get your system back up and running.
Solarfixx price
A standard replacement inverter from Solarfixx costs £900, supplied and fitted, across Birmingham and the West Midlands. The national ranges below are for context. Call 0121 798 2497 or email a photo of your inverter to info@solarfixx.co.uk.
If you installed solar panels between 2010 and 2015, your inverter is likely reaching the end of its lifespan. The good news? Replacement costs have stabilized, and modern units are far more efficient than their predecessors.
Quick Cost Summary (UK averages)
Pricing by Inverter Brand
Prices vary significantly based on the brand you choose. "Budget" brands have improved massively in quality over the last decade and often offer the best value for money for simple replacements. Premium brands command a higher price for advanced features and slightly longer warranties.
| Brand Tier | Brand Examples | Est. Cost (3.6kW Unit) |
|---|---|---|
| Value / Standard | SolaX, Fox ESS, Growatt, Solis | £500 - £800 |
| Mid-Range | GoodWe, Huawei, Sungrow | £800 - £1,100 |
| Premium | SolarEdge, SMA, Fronius | £1,200 - £1,800+ |
*Prices above are for the unit only. Installation labour is typically extra.
Labour & Installation Costs
Buying the unit is only half the equation. You must hire a qualified electrician or solar engineer to install it safely. This is not a DIY job—high voltage DC electricity can be lethal.
- Standard Swap (£350 - £500): If the new inverter is a similar size and fits in the exact same location, the labour is relatively straightforward (2-4 hours).
- Complex Retrofit (£500 - £800): If cabling needs extending, the consumer unit needs upgrading, or you are switching from a string inverter to SolarEdge (optimizers required), costs increase significantly.
4 Factors That Affect Price
- System Size (kW): A 3.6kW inverter for a standard semi-detached house is cheaper than a 10kW 3-phase commercial unit.
- Connectivity: Most modern inverters come with WiFi dongles. If you need a hardwired LAN connection or 4G, this may cost extra.
- Location: If your inverter is in a difficult-to-access loft requiring boarding or ladders, labour time increases.
- DC Switch Upgrades: Older regulations didn't strictly require DC isolators. A good installer will fit them if they are missing, adding roughly £50-£100 to the bill.
Money-Saving Tips
Check Your Warranty First
Before spending a penny, find your original paperwork. Some premium brands (like SolarEdge) have 12-20 year warranties. Standard inverters usually only have 5-10 years.
Don't Repair, Replace
Component-level repairs (fixing a board) often cost £300+ and only come with a 3-month guarantee. A new unit costs slightly more but gives you a fresh 10-year warranty.
Consider an Upgrade
If you plan to get batteries later, pay extra now for a "Hybrid" inverter. It saves you buying a completely new AC charger later.
Local vs National
National solar companies often have high overheads. Local specialists (like Solarfixx) typically offer lower rates for maintenance work.
Is It Worth It?
Absolutely. If you are on the original Feed-in Tariff (FiT) scheme, a working system can generate £500-£2,000 per year in payments. Leaving a system broken for 6 months could cost you more in lost revenue than the price of the replacement itself.
Get a Fixed Price Quote
We provide fixed-price replacements in Birmingham & the West Midlands. No hidden fees.