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Typical System Cost
Average Annual Savings
Typical Payback Period
Save up to 70% on electricity and protect against future price hikes.
Homes with solar panels sell faster and for more.
Solar PV works year-round, even in cloudy conditions.
Sell unused electricity back to the grid and generate additional income.
The amount you can save depends on your system size, energy usage and property. Here’s a typical example of what homeowners in South Wales can expect
See typical savings based on system size and usage.
| Home Type | Solar System Size | Estimated Annual Savings |
|---|---|---|
| 2-3 Bed House | 3kW System | £400 – £600 |
| 3-4 Bed House | 4kW System | £500 – £700 |
| Larger Homes | 5kW+ System | £700+ |
Find out exactly how much you could save with a personalised solar design
Most solar systems generate excess energy during the day that would otherwise be exported back to the grid. With battery storage, you can store that energy and use it when you need it most in the evening, overnight, or during peak tariff times
Store unused solar energy for use at night
Reduce reliance on expensive grid electricity
Increase your overall savings and system efficiency
Gain more control over your home’s energy usage
We install high-performance batteries from trusted brands like Tesla, Solax, and Duracell — all tailored to suit your property and usage.
Many of our customers now choose to install battery storage alongside their solar system
Get a free, no-obligation quote from our South Wales solar experts and see how much you could save
Switching to solar is a big step especially here in Wales where energy prices are unpredictable and the weather isn't always sunny. Here’s what some of our customers had to say after choosing Celtic Green Energie.
"Our electricity bills were getting out of control. Since installing solar, we’ve already noticed a big drop in our monthly costs. The team were brilliant from start to finish..” — Eleri & Dafydd
“We weren’t sure solar would work in Wales, but it’s been better than expected. Even on cloudy days we’re still generating energy.” — Brian
“We were worried about how the panels would look, but they actually blend in really well. The install was quick and professional.” — Ceri,
We are professional solar panel installers based in South Wales, helping homeowners and businesses reduce energy bills and take control of rising electricity costs.
At Celtic Green Energie, we combine industry-leading technology with local expertise to deliver tailored solar solutions that maximise efficiency, savings, and long-term performance. From your initial consultation through to installation and aftercare, our team ensures a seamless and stress-free experience
Thinking about switching to solar energy? You’re not alone. At Celtic Green Energie, we know that investing in solar panels or battery storage is a big decision and naturally, you’ll have questions. Whether you’re curious about costs, performance in Welsh weather, or how solar panels work with the grid, we’ve answered the most common questions below to help you make an informed choice with confidence.
The cost varies depending on the system size, brand, and installation complexity. On average:
Most residential solar panel installations do not require planning permission as they fall under Permitted Development Rights. However, listed buildings or properties in conservation areas may need approval.
Solar panels typically last 25-30 years with minimal degradation. Most manufacturers provide warranties for 20-25 years.
Yes — solar panels still work on cloudy days, just at reduced efficiency. While direct sunlight produces the most electricity, modern solar panels can still generate power from diffused sunlight, which passes through clouds. On average, they produce around 10–25% of their usual output during overcast conditions.
However, solar panels do not generate electricity at night, since there is no sunlight. That’s where solar battery storage becomes important — it stores excess energy produced during the day, so you can use it when the sun goes down.
With solar and battery systems from Celtic Green Energy, you can stay powered up around the clock — even when it’s cloudy.
Most solar panel systems in the UK pay for themselves within 6-10 years through energy savings and Smart Export Guarantee (SEG) payments.
The SEG scheme allows homeowners to sell excess solar energy back to the grid, earning money on unused electricity. Rates vary by energy provider.
Solar panels are built to last and need minimal maintenance. In most cases, the rain in Wales helps keep them clean, but we recommend a visual check once or twice a year for debris or shading.
At Celtic Green Energy, all our panels come with a lifetime guarantee, giving you complete peace of mind. We also offer:
✅ Annual performance checks
✅ Optional professional cleaning
✅ Battery & inverter servicing
✅ Ongoing expert support
👉 With our lifetime-backed panels and local team, your solar system stays efficient and worry-free for years to come.
Yes! Battery storage systems allow you to store excess energy during the day and use it at night, maximizing savings and reducing reliance on the grid.
Ideal roofs:
✅ South-facing for maximum sunlight exposure.
✅ East or West-facing can still generate significant power.
✅ Minimal shading from trees or buildings.
✅ Strong roof structure to support panel weight.
Solar panels increase property value and make homes more attractive to buyers. You can sell your home with the panels or, in some cases, transfer ownership of a solar lease.
Ready to go solar with a local company you can trust? Celtic Green Energie are ready to help homes across Carmarthenshire, Swansea, Cardiff—and beyond—switch to solar power. Get your free quote today.