Repair renewables.

A fault in a renewable system doesn't just stop your green energy production; it can also pose safety risks or lead to higher energy bills as your home reverts to the grid. Timely repairs by qualified technicians are essential to keep your system efficient and compliant with UK safety standards.

What Does the Work Involve?

• System Diagnostics: Using specialist software and hardware to read fault codes from inverters or heat pump controllers to pinpoint the failure.
• Safety Isolation: Securely shutting down the system, including isolating DC strings for solar or refrigerant circuits for heat pumps.
• Electrical Testing: Checking continuity, insulation resistance, and voltage across MC4 connectors, fuses, and isolator switches.
• Component Replacement: Swapping out faulty inverters, optimisers, sensors, or circulating pumps with manufacturer-approved parts.
• Performance Calibration: Re-commissioning the system to ensure it is communicating correctly with the grid and your home monitoring apps.

Typical Costs

Repair costs vary significantly depending on the technology and the specific component that has failed. The prices below reflect current 2025/26 UK market rates including VAT.

Factors affecting the final bill include the height and accessibility of your roof (which may require scaffolding), the age of the system, and whether parts are still covered by a manufacturer’s warranty.

How Long Does It Take?

• Standard Diagnostics: 1–2 hours to identify the fault and provide a quote for parts.
• Inverter or Component Swap: 2–4 hours for a direct replacement and re-testing.
• Complex Wiring Repairs: 1 full day if cables have been damaged by rodents or weather.
• Heat Pump Re-gassing: 3–5 hours, as the system must be vacuum-tested before refilling.

DIY or Professional?

Renewable energy repairs are not suitable for DIY. Solar systems involve high-voltage DC electricity which remains "live" as long as the sun is shining, even if the main switch is off. Heat pumps involve F-Gas refrigerants that require legal certification to handle.

Attempting to repair a renewable system yourself will almost certainly void your manufacturer warranty and your MCS certification, potentially making your home uninsurable or ineligible for export tariffs like the SEG (Smart Export Guarantee).

Choosing the Right Tradesperson

• Check MCS Certification: Ensure the firm is Microgeneration Certification Scheme (MCS) accredited for the specific technology.
• Electrical Qualifications: For solar and batteries, the technician should be a qualified electrician (NAPIT or NICEIC registered).
• F-Gas Registration: Essential for anyone working on the internal refrigerant circuits of a heat pump.
• Ask about Warranties: Will the repair work be guaranteed, and for how long?
• Manufacturer Approval: Ask if they are "approved installers" for your specific brand (e.g., Tesla, Vaillant, or Enphase) to ensure access to proprietary parts.

UK Regulations

• Part P (Building Regulations): Most electrical work in dwellings must be compliant and often notified to local building control.
• G98/G99 Regulations: Repairs that involve changing an inverter must ensure the new unit remains compliant with National Grid connection standards.
• MIS Standards: MCS-certified installers must follow specific Microgeneration Installation Standards during repair and maintenance.

Common Problems

• Inverter Failure: Typically occurring between years 8 and 12, this is the most common reason for a total solar system shutdown.
• Bird Nesting: Pigeons nesting under panels can damage wiring and cause "earth faults" that trip your electrics.
• Sensor Faults: In heat pumps, a faulty thermistor can cause the system to work harder than necessary, spiking your energy bills.
• Communication Errors: Wi-Fi or CT clamp issues often lead homeowners to believe the system is broken when it is simply failing to report data.

Frequently Asked Questions