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Annual savings (estimate) Bill savings
£1612.0 87%
Annual savings (estimate) £1612.0
Local installers | No obligation
Bill savings 87%
Based on: 15 kWh/day usage · 5 kW solar · 5 kWh battery · typical tariffs

Solar & Battery Savings in South East England, United Kingdom Get quotes from local installers

Design solar and battery systems for South East England, the UK's most populous region encompassing Greater London, Kent, Surrey, Sussex, and Hampshire. With over 9 million residents and excellent solar potential, South East England leads the UK in solar installations.

Solar Energy Savings in South East England

How Solar Reduces Your Electricity Bills

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

What drives your savings in South East England

South East England is one of the UK’s strongest solar regions, with yields of 980–1,030 kWh/kWp — Kent and East Sussex consistently rank among the top-performing counties. High retail electricity rates of 24–34p/kWh and strong generation combine to deliver some of the fastest payback periods in the country. The region’s mix of larger detached properties often supports systems of 4–6 kW, maximising both self-consumption savings and SEG export income.

Your usage & system size South East England

Energy usage & tariffs

Energy consumption patterns in South East England reflect the region's mix of dense urban areas like Greater London and more rural communities across Kent, Surrey, Sussex, and Hampshire. The average household in South East England uses between 10-20 kWh per day, with London properties typically at the lower end due to smaller average home sizes, whilst larger homes in Surrey, Kent, and Hampshire may consume more. Energy-efficient properties throughout the region 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 South East England, where higher property values make energy efficiency improvements a sound investment that 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 South East England. We recommend sizing between 5.9kW and 7.9kW for optimal results, accounting for daily and seasonal variations. South East England benefits from relatively good solar potential for the UK, with annual generation factors typically around 3.8-4.2 kWh/kW/day, though this varies significantly between summer and winter months.

A 5.9 kW system in South East England generates approximately 22.2 kWh daily on average, with seasonal variation from 2.09 kWh/kW/day in December to 4.63 kWh/kW/day in August. The region's southerly location provides better solar generation than northern parts of the UK, making solar particularly attractive for homeowners here.

1 kW 20 kW

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A 5 kW system in South East England can generate approximately 6871.0 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 South East England, depending on your consumption patterns, drawing 55% from the grid. Adding a 10 kWh battery increases energy independence to approximately 91% annually, reducing grid reliance to 9%. Battery storage is especially valuable in South East England, where higher electricity prices (often 25-30p per kWh) make maximising self-consumption particularly cost-effective.

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 South East England

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 Greater London

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

  • Good Energy — Greater London, England
  • Upvolt Energy — London and South East, England
  • Acen Solar — London, Essex and Kent, England
  • Pace Solar — South West and Central London, England
  • Greenway Energy Ltd — London and South East, England

Compare multiple installer quotes through The Eco Experts.