Solar Panel Maintenance & System Upgrades
Solar panel maintenance and solar maintenance services across the UK. If your existing system is underperforming, the smartest fix is rarely patching ageing kit — it's a modern upgrade or battery retrofit that pays for itself. Free, honest survey: 0800 099 6606.
The honest answer on solar maintenance
Most solar panel maintenance call-outs trace back to one root cause: ageing equipment. Inverters last 10–12 years; FiT-era panels (2010–2015) produce roughly half the output of modern panels. For systems over 8 years old, an upgrade or battery retrofit usually delivers more than any servicing plan — and because modern installs include free lifetime monitoring, maintenance is built in.
Solar maintenance vs system upgrade — what actually fixes underperformance
Most "solar maintenance" call-outs we used to attend traced back to the same root cause: equipment at end-of-life. Inverters last 10–12 years. Panels fitted in the FiT era (2010–2015) produce 250–300W each — modern panels produce 430–500W from the same roof space. Paying £150–£300 a year to service ageing kit is often money spent propping up a system that should be modernised.
So we changed our model. We now focus exclusively on what actually fixes the problem: full solar panel installations, battery storage retrofits, and complete solar + battery systems — including replacements of FiT-era installs and battery retrofits that transform what your existing panels deliver. Every install includes free lifetime monitoring, so maintenance is designed in from day one rather than sold as a recurring contract.
That is also why we no longer offer standalone servicing plans. When we survey an underperforming system we will tell you honestly whether it needs a one-off fix, a battery retrofit, or a full replacement — and if a simple repair is all you need, we will say so and point you to a specialist. No padded service contracts, no propping up kit that is past its best.
How we diagnose an underperforming solar system
Before we quote anything, our engineer runs a free five-point diagnostic. Here is exactly what we check — and what each result means for whether you need a clean, a part, or an upgrade.
Monitoring & generation review
We compare your current yield against the install-year baseline. A drop of more than 10% on a clear day points to a real fault rather than weather — and tells us whether the fix is a clean, a part, or an upgrade.
Inverter health
We read fault codes and check capacitor and fan condition against the 10–12 year inverter lifespan. A failing inverter is the single most common cause of underperformance — and replacement is the ideal moment to go hybrid and battery-ready.
Panel & string inspection
Visual and thermal inspection for hot spots, micro-cracks, soiling, bird fouling and moss. This distinguishes panels that simply need a clean (5–15% recoverable) from panels that are genuinely degrading and worth replacing.
Electrical & isolation safety
We check DC isolators, cabling, RCD/earthing and MCS compliance. Older FiT-era installs sometimes have ageing isolators that are both a safety and a performance issue.
Self-consumption & tariff fit
We measure how much of your generation you actually use versus export. If self-consumption is below 50%, a battery retrofit (lifting it to 80%+) delivers more than any servicing plan ever could.
If it is a quick fix, we will tell you. If your system is reaching end-of-life, an upgrade pays back faster than ongoing servicing — and we will quote both routes honestly so you can decide.
How we fix solar for good — install, retrofit, replace
Solar panel cleaning: when it helps, and when it's masking a bigger problem
UK rainfall handles most soiling on its own. Professional solar panel cleaning genuinely recovers 5–15% of lost yield on arrays that are bird-fouled, mossy, or pollen-heavy — typically panels near trees, farmland or the coast. If that describes your roof, a clean is worthwhile.
But if your output is down more than 15%, the cause is usually inverter or panel degradation, not dirt — and no amount of cleaning will fix that. For systems 8+ years old in particular, the spend is far better put toward a battery retrofit or a replacement system that recovers the yield permanently. Our free survey tells you which it is before you spend anything.
We assess solar performance and upgrade options across:
Commercial solar panel maintenance and O&M
Commercial and agricultural solar is a retained, growing part of our business — and operations & maintenance (O&M) is built into every commercial install and PPA contract rather than sold standalone. That means monitoring SLAs, annual inspection and inverter cover on systems from 30 kWp to 1 MWp, all designed in from commissioning.
If you run a warehouse, factory, farm or office and your existing array is underperforming, our commercial team will survey it and advise on the most cost-effective route — repair, expansion or replacement. Explore commercial solar and agricultural solar.
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"Andy gave me great advice about adding a battery to my existing system. He was very knowledgeable and clear. Thanks to all at SMS."
"All brilliant from beginning to the end. Professional team who really know their stuff. Would recommend to anyone looking for solar solutions."
"I received very efficient and helpful service from this company. Especially Jaimie who came when he said he would and was friendly and professional throughout. Can't recommend this company highly enough."
Common questions
Do you offer standalone solar panel maintenance?
My existing solar system is underperforming — what should I do?
Do new installations come with maintenance included?
Can you add a battery to my existing solar panels?
How often do solar panels need maintenance or servicing?
How much does solar panel maintenance cost?
Do you maintain solar panels you did not install?
What is the difference between solar maintenance and a battery retrofit?
Get a free, honest system health check
Underperforming system, ageing inverter, or just want to know if a clean is enough? We'll run a free 5-point diagnostic and tell you straight — repair, retrofit, or replace. MCS certified, Tesla Certified Installer, 11,000+ installs since 2012.