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Annual savings (estimate) Bill savings
£1604.0 87%
Annual savings (estimate) £1604.0
Local installers | No obligation
Bill savings 87%
Based on: 15 kWh/day usage · 6 kW solar · 5 kWh battery · typical tariffs

Solar & Battery Savings in Wales, United Kingdom Get quotes from local installers

Design solar and battery systems for Wales using Photonik's professional design platform. Wales leads the UK in solar panel installations, with constituencies like Ynys Môn (Anglesey) recording 7,598 solar panels per 100,000 residents—the highest in the UK. The Welsh Government has been proactive in supporting solar energy projects, and solar installations qualify for 0% VAT.

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Solar Energy Savings in Wales

How Solar Reduces Your Electricity Bills

The calculations below show how your electricity bills change with solar.

What drives your savings in Wales

Wales sees moderate to good solar irradiance, with south Wales (Pembrokeshire, Swansea, Cardiff corridor) achieving 920–950 kWh/kWp while northern areas sit closer to 880 kWh/kWp. The same national electricity rates of 24–34p/kWh and SEG export payments apply as in England. Wales has no region-specific solar rebates, but 0% VAT on installations and the national policy framework make the savings case similar to equivalent English regions at the same latitude.

Your usage & system size Wales

Energy usage & tariffs

Energy consumption patterns in Wales reflect the region's mix of urban areas like Cardiff and Swansea and more rural communities across the Welsh countryside. The average household in Wales uses between 10-20 kWh per day, with urban properties typically at the lower end due to smaller average home sizes, whilst larger rural homes may consume more. Energy-efficient properties throughout Wales often use significantly less through modern insulation and efficient heating systems.

Before installing solar, consider reducing your energy consumption through improved insulation and energy-efficient appliances. This is particularly valuable in Wales, where the region's leadership in solar adoption reflects excellent conditions for solar investment, and reducing consumption can reduce required solar system size and improve returns.

5 kWh 100 kWh
£ /kWh
£ /kWh
%

lightbulb Note: These are simplified estimates. For detailed tariff inputs and advanced calculations, use the full Photonik app.

Representative flat export rate (feed-in tariff). What you earn per kWh of surplus solar exported to the grid. Your actual rate depends on your provider, plan, and time of day.

See how export rates work →

Estimated at 75% of the retail grid rate. A battery lets you store daytime solar and export during expensive peak hours, so each exported kWh is typically worth more than a flat feed-in tariff. Real returns depend on your time-of-use tariff and battery efficiency.

See how export rates work →

Solar system size

You'll need around 3.9kW of solar to match your average consumption in Wales. We recommend sizing between 5.9kW and 7.9kW for optimal results, accounting for daily and seasonal variations. Wales benefits from good solar potential for the UK, with annual generation factors typically around 3.5-4.0 kWh/kW/day, though this varies significantly between summer and winter months.

A 5.9 kW system in Wales generates approximately 22.0 kWh daily on average, with seasonal variation from 2.06 kWh/kW/day in December to 4.63 kWh/kW/day in August. Wales's leadership in solar panel installations (highest per capita in UK) reflects the region's strong commitment to renewable energy and makes solar particularly attractive for homeowners.

1 kW 20 kW

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A 6 kW system in Wales can generate approximately 8177.0 kWh annually based on local sun conditions.

Battery storage

With solar-only (no battery), a 5.9 kW system provides approximately 45% self-usage in Wales, depending on your consumption patterns, drawing 55% from the grid. Adding a 10 kWh battery increases energy independence to approximately 90% annually, reducing grid reliance to 10%. Battery storage is valuable in Wales, allowing you to store excess summer generation for use during darker winter months and maximising the value of your solar investment.

Some suppliers now offer wholesale-linked or time-of-use export tariffs, paying significantly more for electricity exported during peak demand hours (typically 4–7pm) than the standard flat SEG rate. With a battery, you can store daytime solar and export at these higher rates, or simply use it yourself during peak pricing. For accurate battery savings and ROI calculations specific to your location, use the full Photonik design tool.

0 kWh 30 kWh

lightbulb A 0kWh battery will make you about 0% self sufficient.

The sweet spot for most households is 5 – 13 kWh — larger batteries add independence but with diminishing payback, especially where feed-in tariffs are low.

System Pricing & Payback for Wales

Use the full Photonik solar planning and design platform to model a complete system for your home — including detailed costs, equipment options, and financial returns.

Try Photonik Solar Design

For a quick price guide, see the United Kingdom solar calculator.

Solar Installers Cardiff

Example local businesses with published addresses; not ranked by Photonik or by star ratings.

  • Green Energy Solar — Cardiff and South Wales, Wales
  • EE Renewables — Cardiff and South Wales, Wales
  • Tewdric Energy — Cardiff and Vale of Glamorgan, Wales
  • Urban Solar Ltd — South Wales, Wales

Compare multiple installer quotes through The Eco Experts.