Solar PV maintenance for existing solar panel and battery systems helps identify performance losses early and keeps the installation operating as intended. It is for homeowners across Surrey and SW London who already have a system installed, whether by us or another installer, and the next step is a scheduled inspection or, if something has gone wrong, a fault-finding visit. A Tier-1 solar and battery system represents a capital investment of between £8,000 and £30,000 and carries manufacturer warranties of up to 25 years. Those warranties are only as strong as the maintenance discipline behind them. We provide structured asset management programmes for solar PV systems across Surrey and SW London - from annual thermal imaging and inverter diagnostics to fault finding and emergency repair - designed to keep your system generating at its warranted capacity for its entire operational life.
A comprehensive annual health check across every component of your solar PV system. We review inverter performance data, verify DC string voltages and currents against design specification, inspect all mounting hardware and roof penetrations for integrity, check isolator and junction box torque, and confirm firmware versions are current. We provide a written report on conclusion - suitable for warranty records, insurance, and Smart Export Guarantee administration.
For Surrey and SW London properties where the solar system is a significant capital asset, our thermal and yield audit goes beyond the standard annual inspection. We perform thermal imaging across the full array to detect hotspots indicating failing cells or bypass diodes, carry out I-V curve tracing on individual strings to identify underperforming panels, and compare actual yield against the original MCS design forecast.
When a Surrey or SW London solar panel system stops generating, trips an inverter, or produces unexpectedly low output, our engineers diagnose the fault using systematic DC string testing, earth fault location, inverter error-code diagnosis and panel-level isolation testing, then carry out the appropriate repair. We carry approved OEM replacement components for SolarEdge, SMA, Fronius, Huawei, GivEnergy, and Tesla platforms, and aim to restore full output in a single visit.
A solar PV system in Surrey or SW London generates between 900 and 1,100 kWh per kWp installed per year. A system operating at 5% below designed yield can cost its owner between £75 and £150 per year in foregone generation income per kWp of installed capacity. Over 25 years, a poorly maintained 6kWp system can cost its owner in the region of £10,000 or more in lost return compared to a system kept at warranted performance, depending on tariff and generation conditions. Annual inspections also provide the documented maintenance evidence required by most Tier-1 manufacturer warranties and by home insurance policies covering renewable energy assets.
We maintain systems installed by any MCS-accredited installer. Our engineers are qualified on all major platforms - SolarEdge, SMA, Fronius, Huawei, GivEnergy, Tesla Powerwall, and Sigenergy - and we typically recommend targeted repair and component replacement over full system replacement where technically feasible and financially justified.
We request your existing MCS certificate, monitoring data, and any current fault codes before we visit. This allows us to arrive with the correct test equipment, relevant firmware tools, and any high-probability OEM components already sourced.
We carry out full visual, structural, and electrical inspection of your Surrey or SW London installation - string tests, inverter data analysis, thermal imaging where indicated, and torque verification of all mechanical connections.
You receive a structured written report covering every inspection item, with clear categorisation of any faults as critical, advisory, or monitoring. Any approved repair work is carried out using OEM or manufacturer-approved components to preserve warranty validity.
We issue a maintenance record document on completion - suitable for your warranty files, mortgage lender requirements, and property sale documentation. We also provide a forward maintenance schedule and any recommended system upgrades.
Most Tier-1 manufacturers recommend at least one professional inspection per year to support warranty validity, though the right frequency depends on your system's age, location and any exposure to shading, coastal air or heavy tree cover. We agree an inspection schedule with you based on your specific installation.
Cost depends on system size, the scope of testing required, such as a standard annual inspection compared with a full thermal and yield audit, and whether any fault diagnosis or repair work is needed. We confirm a fixed price for the agreed scope before any visit is booked.
Yes. We maintain systems installed by any MCS-accredited installer, and our engineers are qualified across major inverter and battery platforms, including SolarEdge, SMA, Fronius, Huawei, GivEnergy, Tesla Powerwall and Sigenergy. We review your existing certification and monitoring data before the first visit so we understand the system's history.
Any fault is categorised in your written report as critical, advisory or for ongoing monitoring, so you can see how urgent it is. Where repair work is approved, we typically recommend targeted component repair or replacement over full system replacement where that is technically feasible and represents good value for the fault found.
Most Tier-1 manufacturer warranties and some home insurance policies covering renewable energy assets expect documented, regular maintenance. We issue a maintenance record after each visit that can be used for warranty files, insurance purposes and, where relevant, mortgage lender or property sale documentation. We cannot guarantee a manufacturer or insurer's decision in any individual case.
Contact us with your system details, or use the enquiry form on this page, and we will confirm what information we need, such as your existing MCS certificate and any monitoring data, before agreeing an inspection date and a fixed price for the agreed scope.