Plenty of companies will sell you an annual solar maintenance contract. We used to. Then we did the maths over a realistic 10-year horizon and changed our model — because for most homeowners that money returns far more invested in an upgrade than spent propping up ageing kit. Here is the honest comparison.
What a service contract actually buys
A typical UK solar maintenance contract runs £150–£300 a year and bundles one or two cleaning visits, a visual inspection, and a monitoring review. Over 10 years that is £1,500–£3,000. What it does NOT do is increase what your system produces or what you save — it is pure upkeep on a fixed asset that, frankly, has very few things that need upkeep.
The reality of modern solar maintenance
Modern systems are close to maintenance-free. There are no moving parts except the inverter’s cooling fan. Quality installs — including every one we do — ship with free lifetime monitoring that flags a fault the moment it happens, so you do not need a contract to find problems. Rain handles most cleaning. The single component that genuinely needs attention is the inverter, and only at around year 10–12 when it reaches end-of-life.
The 10-year comparison
Option A — annual service contract: £1,500–£3,000 over 10 years. System still produces the same ~30% self-consumption it always did. At the end you still face the inverter replacement.
Option B — one upgrade instead: put that budget toward a battery retrofit. A battery lifts self-consumption from ~30% to 80%+ and unlocks a smart export tariff like Octopus Flux — together typically £600–£1,100 a year in extra savings. Over 10 years that is several thousand pounds *returned*, not spent, plus the system stays monitored and warrantied. If the inverter is also ageing, a full solar and battery upgrade modernises everything at once.
The contrast is stark: a service plan is a cost that returns nothing extra; an upgrade is an investment that pays you back every year.
When maintenance spend IS justified
This is not "never spend money on your system." A one-off clean on a genuinely soiled array, a failed-isolator fix, or an inverter repair on an otherwise-healthy 5-year-old system are all sensible. What rarely makes sense is a recurring contract on kit that is either nearly new (and needs nothing) or nearly end-of-life (and needs replacing, not servicing).
How we work now
We do not sell service contracts. We run a free solar system health check, tell you honestly whether you need a one-off fix or whether an upgrade pays back faster, and quote both. For most homes with 5+ year-old panels, the retrofit is the higher-return "maintenance" decision. Call 0800 099 6606 or book a free survey.