What Makes East Anglia Calculations Different
East Anglia benefits from some of the best solar conditions in England. Average annual solar irradiance across Cambridgeshire, Norfolk, and Suffolk is 1,040-1,060 kWh/m² — around 8-12% above the UK national average. This means a 4kW system in East Anglia generates approximately 3,600-3,800 kWh per year, compared to 3,200-3,400 kWh for the same system in the Midlands or North West.
This regional advantage flows directly into the savings numbers. Every kWh your panels generate that you use displaces electricity you would otherwise buy at approximately 27p/kWh (April 2026 Ofgem rate). Every kWh you do not export earns through self-consumption. The higher East Anglia generation multiplied by 27p explains why payback periods here are consistently 12-18 months faster than UK-average figures quoted in national press.
Solar Only: The Baseline Calculation
A 4kW solar system in East Anglia generates approximately 3,700 kWh/year. Without a battery, typical self-consumption is around 35-45% of generation — meaning 1,300-1,665 kWh is used directly, and 2,035-2,400 kWh is exported. At 27p/kWh for electricity avoided, and 15p/kWh for Octopus SEG export payments (a competitive rate), the value is: 1,500 kWh x £0.27 = £405 (self-consumed) + 2,200 kWh x £0.15 = £330 (exported) = £735/year total benefit.
A 4kW system installed with panels and inverter costs approximately £5,500-£7,000 in East Anglia with 0% VAT. At £735/year saving, payback is roughly 7.5-9.5 years. The system should last 25+ years with minimal degradation, making the second decade entirely profit. These numbers are conservative — electricity prices have a long-run upward trend, and future rates will improve payback.
Adding Battery Storage: The Smart Tariff Multiplier
A 10kWh battery (such as a GivEnergy All-in-One or Sunsynk) added to the solar system changes the economics substantially. With a battery, self-consumption rises from ~40% to ~80% of generation. That shift means 800 more kWh per year is used directly rather than exported — saving an additional £216/year (800 kWh x £0.27).
But the bigger gain comes from smart tariffs. On Octopus Flux, you charge your battery from the grid at night for approximately 12p/kWh and export (or use) that stored energy during peak evening periods when export rates are 30p/kWh+. For a household that uses 8kWh per evening peak session 200 nights per year, the arbitrage value is: 8 kWh x (30p - 12p) = £1.44/day x 200 days = £288/year. Combined with the additional self-consumption benefit (£216/year) and the baseline solar savings (£735/year), total annual benefit from a solar + battery system is approximately £1,239/year.
Capital Costs and Payback Period
A combined 4kW solar + 10kWh battery system in East Anglia costs approximately £9,500-£13,000 fully installed with 0% VAT. Using the median cost of £11,000 and annual savings of £1,239/year, simple payback is 8.9 years. The system life is 25+ years for panels and 10-15 years for batteries (with warranty).
For a 6kW solar + 10kWh battery combination — better suited to higher-consumption households or those with an EV — costs are £12,500-£16,000 and annual savings rise to £1,500-£1,800/year depending on usage patterns. High EV-driving households charging primarily from solar see the biggest gains.
What These Numbers Mean for Your Property
These calculations are illustrative. Your actual savings depend on: your current electricity consumption and when you use it, whether you have an EV, your specific roof orientation and shading, and which smart tariff you choose. We model these inputs specifically for your property during our free survey and quotation process.
We produce a detailed savings projection for every customer that includes: annual generation estimate, self-consumption calculation based on your usage profile, export earnings estimate, smart tariff optimisation potential, and payback period with and without battery. This level of specificity — based on your actual property and usage rather than generic UK averages — is what distinguishes a good solar quote from a generic one. Contact us to arrange a free survey across Cambridgeshire, Norfolk, and Suffolk.
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