Maintenance & Upgrades Guides
Every maintenance & upgrades guide from the SMS engineering team — practical, factual, and from the people who fit the systems.
Solar Inverter Fault Codes Explained — What Your Error Really Means (UK 2026)
A plain-English guide to the most common UK solar inverter fault codes and warning lights — SMA, Solis, Fronius, SolarEdge, GivEnergy and Enphase — and whether each one means reset, repair, or upgrade.
Why Is My Solar Generating Less Than It Used To? (UK Diagnostic Guide)
A practical guide to diagnosing falling solar output — how to separate weather from a real fault using the 10% clear-day rule, the most common causes ranked, and exactly what to do about each.
Solar Service Contract vs Upgrade — The 10-Year Maths (2026)
Should you buy an annual solar maintenance contract, or invest that money in an upgrade? An honest 10-year cost comparison for UK homeowners — and why we stopped selling service plans.
Where to go next
- Adding storage is usually the bigger lever: battery storage.
- The combined route is usually cheaper than doing it twice: solar and battery installation.
- On the modular side, EcoFlow home batteries.
- As a Tesla Certified Installer we fit Powerwall 3.
Is your system worth upgrading? Find out free.
Tell us your postcode and what you have. A real engineer reviews it and comes back within one working day with an honest answer — including when the answer is "leave it alone".