Luton sits in the Midlands baseline zone at the UK average for solar irradiance. A 4kW system generates around 3,400 kWh a year. South Bedfordshire is close enough to the South-East to benefit from competitive installer pricing from both the Home Counties and Midlands markets. Luton's proximity to London means elevated electricity costs, strengthening the solar case.
Generation uses a UK baseline of 850 kWh per kWp installed, adjusted for your region's solar irradiance, roof orientation, pitch and shading. South-facing roofs at 30–45° hit the baseline; east/west takes a 15% hit; north loses a third.
Self-consumption defaults to 40% without a battery — the rest exports to the grid. A battery raises self-consumption progressively up to 80% at ~15 kWh capacity.
Savings = self-consumed kWh × your import rate, plus exported kWh × your SEG rate. Apply 0.5% panel degradation per year over the 25-year warranty.
Install cost reflects 2026 UK ranges with 0% VAT (in force until April 2027). Battery cost: roughly £350/kWh installed plus a £2k base.
This is an estimate. Actual generation and quotes vary — get a site survey from an MCS-certified installer before committing.