What's actually covered when you go solar with us
Solar systems come with several separate warranties, not one blanket guarantee — and it's worth knowing what covers what before something goes wrong, not after.
Our workmanship warranty — 10 years
This covers our installation work: mounting, wiring, connections and commissioning. If something we did causes a problem within 10 years, we fix it. This is separate from and additional to the manufacturer warranties below — it's our own guarantee, backed by a NICEIC-registered, MCS-certified installer that isn't going anywhere.
Solar panel warranty — typically 25 years
Panel manufacturers guarantee two things separately:
- Product warranty (usually 12–15 years) — covers manufacturing defects in the panel itself
- Performance warranty (usually 25 years) — guarantees the panel still produces a set minimum percentage of its original output (typically around 80–87% at year 25)
Panels degrade very slowly — usually under 0.5% output loss per year — so this warranty is mostly a formality rather than something you'll need to claim on.
Inverter warranty — typically 5–12 years
The inverter is the component most likely to need attention over a system's lifetime — it's the part doing continuous electronic work converting DC to AC. Standard warranties run 5–12 years depending on brand and model; some can be extended at purchase. We'll tell you exactly what's covered on the specific inverter we quote you.
Battery warranty — typically 10 years or a cycle count
Battery warranties are usually expressed as whichever comes first: a number of years (commonly 10) or a number of charge cycles, often alongside a guaranteed minimum capacity retention (e.g. 70% capacity at year 10). Battery technology and warranty terms vary more between brands than any other component, so this is worth comparing carefully — we only fit batteries from manufacturers with a solid UK track record and support network.
What voids a warranty
The most common way people accidentally void a warranty is using an uncertified installer. Manufacturer warranties on solar equipment typically require MCS-certified installation and commissioning — miss that, and you can lose the panel or inverter warranty entirely, even if the equipment itself is fine. It's a big part of why we never cut corners on certification.
Keep your paperwork. We provide your MCS certificate, warranty documents and system schematic at handover — store these somewhere safe. You'll need them for SEG registration, for any future warranty claim, and if you ever sell the property.