South Wales gets more sunshine than most people assume. Swansea averages around 1,600 hours of sunshine per year — enough for a well-sized solar PV system to generate a significant proportion of a typical household’s annual electricity use. If you’re thinking about going solar in 2026, this guide covers everything you need to know: how the technology works, what a system costs, how quickly it pays back, and what to expect from the installation process.
How solar PV works
Solar photovoltaic (PV) panels convert sunlight directly into electricity using semiconductor cells — typically monocrystalline silicon in modern residential systems. The panels generate DC electricity, which an inverter converts to AC for use in your home. Any surplus electricity you generate but don’t use is exported to the grid, and you receive a payment for it through the Smart Export Guarantee (SEG).
Panels work on daylight, not direct sunshine — so they generate electricity even on overcast days, just less of it. In South Wales, south-facing roofs at a pitch of 30–40° give the best annual output, but east- and west-facing roofs at the correct tilt can still produce 80–90% of the output of a south-facing equivalent.
What size system do you need?
System size is measured in kilowatt-peak (kWp) — the maximum power output under standard test conditions. As a rough guide:
| Household size | Typical system | Annual generation (est.) |
|---|---|---|
| 1–2 bedrooms | 3.5 kWp (8–9 panels) | ~3,000 kWh |
| 3 bedrooms | 5.0 kWp (10–12 panels) | ~4,300 kWh |
| 4+ bedrooms | 6.5 kWp (14–16 panels) | ~5,600 kWh |
The average UK home uses around 2,700–3,500 kWh per year, so a correctly sized system can comfortably cover a large share of annual consumption. If you have an electric vehicle or are planning to add a heat pump, a larger system (and battery storage) will give you a better return.
How much does solar PV cost in South Wales?
Installed costs vary by system size, roof type and inverter choice. Typical fully-installed prices in 2026 — including 0% VAT — are:
| System size | Typical installed cost |
|---|---|
| 3.5 kWp | £4,500–£5,500 |
| 5.0 kWp | £5,800–£7,000 |
| 6.5 kWp | £7,000–£8,500 |
These prices include the panels, inverter, mounting system, DC/AC cabling, generation meter and DNO notification. They do not include battery storage, which adds £2,500–£5,000 depending on capacity.
0% VAT on solar panels and battery storage — The current 0% VAT rate on residential solar and battery installations has been extended until 31 March 2027. After that date it reverts to 20%. This is a significant saving on a typical 5 kWp system and battery.
Payback period and return on investment
At current electricity prices (around 24–26p/kWh on a standard tariff), a 5 kWp system in South Wales generating 4,300 kWh per year could save a typical household £600–£900 per year in avoided electricity costs, depending on how much of the solar generation is self-consumed at home.
Add in Smart Export Guarantee (SEG) payments for exported electricity — currently 15p/kWh with the best tariffs — and annual returns increase further. A realistic payback period for a 5 kWp system is 7–10 years, after which the system generates effectively free electricity for its remaining lifespan of 25+ years.
Can you add battery storage?
Yes — and for most homes it makes strong financial sense. A battery lets you store surplus daytime solar generation and use it in the evening, rather than exporting it at a lower price. Popular batteries we install include Fox ESS, Sigenergy and Fogstar, ranging from 5 kWh to 20 kWh of usable capacity.
Batteries also qualify for 0% VAT until March 2027, making this the best time to combine solar and storage in a single installation. See our battery storage page for full details and current pricing.
Are there grants for solar panels in South Wales?
There is currently no direct government grant for solar PV in England or Wales (unlike heat pumps, which benefit from the BUS grant). However, the following support is available:
- 0% VAT — saving 20% on the installed cost of panels and batteries until March 2027
- Smart Export Guarantee (SEG) — ongoing payments for exported electricity
- Warm Homes Wales — fully-funded solar for eligible low-income households in Wales
- ECO4 scheme — funding for energy efficiency measures including solar in some cases
If you are on a lower income, ask us about ECO4 and Warm Homes Wales — you may qualify for a fully-funded system.
Is my roof suitable for solar panels?
Most roofs in South Wales are suitable. The key factors are:
- Orientation — south, south-east or south-west facing is ideal. East and west-facing roofs are viable with slightly lower output.
- Pitch — 15–50° works well. Flat roofs can use angled mounting frames.
- Shading — trees, chimneys and neighbouring buildings can reduce output. Micro-inverters or power optimisers can mitigate partial shading.
- Condition — the roof covering should be in good condition. We will flag any issues during our free survey.
- Listed buildings and conservation areas — permitted development rights generally apply in Wales, but listed buildings require listed building consent. We can advise.
What happens on installation day?
A typical residential solar installation takes one to two days, depending on system size. Here is what to expect:
- Day 1: Our roofer fits the mounting rails and flashing kits to your roof. The panels are lifted up and clipped into the rails. DC cabling is run down to the loft or consumer unit area.
- Day 1 or 2: Our electrician connects the inverter, fits the generation meter and carries out the AC connection. The system is commissioned and tested.
- MCS certificate: We register the installation with MCS and provide your certificate — required to claim SEG payments from your energy supplier.
- DNO notification: We notify your distribution network operator (Western Power Distribution in South Wales) and handle all the paperwork.
After installation, you will receive a full handover, including how to read your generation data and how to set up your SEG application with your energy supplier.
Why choose Eco Care Solutions for solar PV?
Eco Care Solutions is based in Swansea and has been installing renewable energy systems across South Wales since 2008. We are MCS accredited, Gas Safe registered and carry full public liability insurance. All our solar installations are carried out by directly-employed engineers — we do not subcontract.
We offer a 10-year workmanship warranty and ongoing aftercare. If you have a question or an issue after installation, you call us directly — not a warranty helpline.
Ready to get a quote? Book your free no-obligation survey and we will design a system for your property, confirm your roof suitability and provide a detailed fixed-price quote. No pressure, no hard sell.