Solar & battery — full spec
Every Geko install, in detail.
The panels, the inverters, the batteries, the finance options and the warranty terms — everything you'd want to interrogate before booking a consultation.
Panels
Tier-1 panels only.
We only fit panels from manufacturers ranked Tier-1 by Bloomberg New Energy Finance — the strongest indicator of long-term financial stability and warranty backing.
DMEG 515W
Our workhorse panel — large-format, top performance per £
Aiko Neostar
Top efficiency, beautiful all-black aesthetic
Inverters
Hybrid by default. Battery-ready from day one.
Fox ESS H3 Hybrid
Battery-ready, EV integration, 12-year warranty
Sigenergy SigenStor
All-in-one inverter + battery system — modular stack, beautiful design
Batteries
Three brands. All LFP chemistry. All 10+ year warranty.
Fox ESS EP12
Modular stack, LFP chemistry, made and supported in the UK.
Sigenergy SigenStor
All-in-one hybrid system with the inverter built in — the benchmark for slick integration.
Battery sizing
Starting prices for typical retrofits — final cost depends on your existing inverter, cable runs and whether you want a backup circuit.
Small flat or 2-bed home with low evening usage
3–4 bed family home — the sweet spot for most
Larger family home, EV at home overnight, heat pump
Off-grid hybrid, home office + EV + heat pump
Finance
Three ways to fund the install.
Outright purchase
Pay in full at install. Fastest ROI, simplest paperwork. You own the system and all SEG income outright.
Monthly finance
Spread the cost over 5, 10 or 15 years through our FCA-regulated finance partners. We'll share the representative example and full terms on your consultation call.
Nationwide green mortgage
If you have a Nationwide mortgage, an interest-free top-up may be available for green home improvements. We'll flag eligibility on your consultation call.
Warranty
Six layers of protection — line by line.
| Component | Cover | Provider |
|---|---|---|
| Solar panels — product | 25 years | DMEG, Aiko (Tier-1) |
| Solar panels — performance | 25 years (≥80%) | Linear degradation curve |
| Hybrid inverter | 10–12 years | Fox ESS, Sigenergy |
| Battery storage | 10 years | Fox ESS, Sigenergy (LFP) |
FAQ
Everything else.
How long does a solar install take?
Most residential installs complete in a single day. Full process from signing to switch-on is typically 4–8 weeks, mostly waiting on DNO approval.
Do I need planning permission?
Almost never. Solar panels on most UK homes fall under permitted development. Exceptions: listed buildings, conservation areas, and some flats. We check this for you before designing.
Will my roof take it?
Modern panels weigh around 10–14 kg/m² fully mounted — well within the load tolerance of any modern UK roof. Older slate roofs sometimes need a structural assessment; we'll flag this on the site survey.
What's the payback period?
Across our own installs we typically see payback in around 5–6 years, and sometimes a little under. Designing and fitting in-house keeps the install price down, and a battery on a time-of-use tariff adds a second saving on top of the solar itself. After payback, the system generates effectively free electricity for the remaining 15+ years.
Can I add a battery later?
Yes. We fit a battery-ready hybrid inverter from day one, so adding storage in year 2 or 5 is straightforward and doesn't require swapping out the inverter.
Do you handle the SEG paperwork?
We register your install with the relevant certification scheme, hand you the certificate, and point you at the best SEG tariffs (currently Octopus and E.ON pay the most). You apply to the SEG supplier directly — they handle the rest.
Will it work in a power cut?
Standard grid-tied solar shuts off during a power cut for engineer safety. If blackout backup matters, you can add a battery with a dedicated blackout circuit.
What about retrofitting onto an existing solar install?
We routinely retrofit batteries onto 5–10 year old solar systems. Sometimes the existing inverter can be kept; often we add a separate AC-coupled battery inverter to avoid disturbing the original install.
Let's find the right system
for your home.
Book a free video consultation. We'll talk through your needs, your property, and your options — no obligation, no pressure.
0% VAT on installs commissioned before 31 March 2027