3 guides
Maintenance & Upgrades Guides
Every maintenance & upgrades guide from the SMS engineering team — practical, factual, and from the people who fit the systems.
2026-06-28· 9 min read
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.
2026-06-27· 8 min read
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.
2026-06-26· 7 min read
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.