Commercial Solar Maintenance in London
Commercial solar maintenance keeps a London array earning what it was modelled to earn. We service, monitor, clean and repair commercial systems across the capital — including arrays installed by companies that no longer exist.
What maintenance actually protects
A well-built commercial array is a quiet asset — but not a maintenance-free one. Industry literature puts the median output degradation of crystalline panels at about 0.5% a year; the point of maintenance is making sure your losses stay at that baseline rather than the multiples of it that soiling, string faults and failed optimisers silently add. At London’s delivered commercial rates — averaging 24.14p/kWh including CCL in Q1 2026 — a 10% underperformance on even a mid-size array is real money every month, and it shows up nowhere on a bill. It only shows up in monitoring.
The service, itemised
- Monitoring and alerts. Generation checked against the yield model, string by string where the inverter allows — underperformance flagged from data, not from a annual visit finding it late.
- Annual inspection. Electrical testing, connector and isolator checks, mounting and ballast review, thermal inspection of strings and switchgear, roof condition around the array.
- Inverter care and replacement. Inverters are the component that fails first on most systems — we handle warranty claims, firmware, and like-for-like or upgraded replacement when the time comes.
- Panel cleaning. London grime is real: diesel particulate, construction dust, bird traffic around plant. Cleaning cadence is set by the monitoring data, not a fixed calendar — paying for cleans the yield does not justify is its own kind of loss.
- Repairs. Storm damage, string faults, isolator failures, damaged modules — diagnosed remotely where possible, fixed with access equipment appropriate to the roof.
Orphaned systems: arrays whose installer vanished
A meaningful share of London’s commercial solar was installed by businesses that are no longer trading. If that is your array, nothing about it is unserviceable: documentation can be rebuilt from a site survey, monitoring can be re-established or replaced, and manufacturer warranties on panels usually survive the installer’s disappearance even where workmanship warranties did not. The first visit produces a condition report and a fixed annual price — and if the system predates current standards, the report says exactly what does and does not need to change. Considering expanding the array while we are up there? That is priced from the same survey, against current London installed costs and the UKPN headroom the site already has.
Commercial solar maintenance questions
How often does a commercial solar system need servicing?
An annual electrical and mechanical inspection is the norm, with monitoring running continuously in between. Cleaning is set by the data — London roofs near rail, construction or heavy traffic need it more often than the calendar suggests.
Can you maintain a system you did not install?
Yes — including systems whose installer has ceased trading. A survey rebuilds the documentation, monitoring is re-established, and you get a condition report with a fixed annual price.
How much output does a solar panel lose each year?
Industry survey data puts the median at about 0.5% a year for crystalline panels. Maintenance exists to keep your real losses at that baseline — soiling and undetected faults are what push systems well past it.
Get a fixed-price proposal for your building
Tell us where the building is and what it does. You get a priced, planning-checked proposal — no site visit needed to start, no obligation.