Solar Panel Repairs on the Feed-in Tariff: Fix Without Losing FIT Payments

Solar Panel Repairs on the Feed-in Tariff: How to Fix Your System Without Losing Your FIT Payments

Your solar panels were installed in 2010, 2012, or perhaps 2015, and they have been quietly generating income ever since through the UK's Feed-in Tariff (FIT). Every quarter, your licensee sends a payment for the clean energy your property produces and exports. Depending on when your system was commissioned, those locked-in payments are worth thousands over your contract term.

However, aging systems eventually need maintenance. Inverters fail, panels suffer physical cracks, or pigeons begin nesting under the mounting frames. If your original installer has gone out of business, you might worry that touching the system will jeopardise your income. Under Ofgem rules, specific modifications—especially changes that accidentally increase your system's Total Installed Capacity (TIC)—can lead to payment freezes or full cancellation of your registration. Getting repairs done accurately by an MCS-certified specialist is critical.

1. Ofgem's 2026 Capacity Rules Explained

The Feed-in Tariff scheme closed to new applicants in 2019, but existing contracts remain active for their full 20 or 25-year terms. From April 2026, annual rate increases are formally **indexed to CPI rather than RPI** (with the Year 17 table adjusted by 3.4% CPI). Your core contract structure and your right to receive income remain untouched, provided your hardware continues to conform to its registered parameters.

Under Ofgem’s active guidance for FIT generators, you are legally required to notify your licensee of any core hardware alterations. The biggest pitfall involves panel replacements. If four older 250W panels fail, replacing them with modern 400W variants of the exact same physical size increases your system capacity by 600W. If this capacity shift pushes your array into a higher tier, Ofgem can revoke your accreditation and demand the repayment of previous income. Replacements must preserve your original registered capacity framework.

2. Integrating Batteries with Older Arrays

Adding battery storage to a FIT-accredited solar installation is an effective way to optimize your household energy footprint in 2026. By choosing options like the **Tesla Powerwall 3** or a modular **Hanchu ESS** setup, you can store your day-time generation or purchase cheap, off-peak power overnight from smart tariffs.

However, your battery must be wired so that it cannot back-feed or route grid power through your generation meter. If the system is mis-wired and grid energy is incorrectly recorded as solar production, it can be flagged as metering fraud. Our electrical technicians design and certify these loops to ensure seamless, compliant operation.

Note: Following the market changes after GivEnergy Ltd entered administration on 9 April 2026, we focus on Fox ESS, Hanchu, and Tesla ecosystems for long-term component replacements, ensuring our clients receive secure product lines and warranty safety.

3. Common Failure Points on 2008–2015 Installations

If your system was installed during the early peak of the Feed-in Tariff, watch out for these common warning signs:

• Inverter Fatigue: Old string inverters typically have a 10 to 15-year lifecycle. Frequent error logs or total blank screens signal internal component failure.
• DC Isolator Wear: Legacy isolators from this era are highly prone to thermal breakdown, arcing, and water ingress, posing a significant fire safety risk.
• Panel Degradation: Watch for delamination, internal micro-cracks, or brown hotspots that reduce your string's total performance.
• Faulty Meters: If your generation meter locks up or stops counting, your licensee cannot issue your payments. The Energy Ombudsman requires clear meter reporting to authorise your quarterly income.