Cheltenham sits in the Midlands baseline zone at the UK average for solar irradiance. The Cotswolds' open landscape and the town's mixture of Regency townhouses and modern developments creates varied solar opportunities. A 4kW system generates around 3,400 kWh a year. Gloucestershire has good access to both South West and Midlands installer networks.
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.