Solar PV Quick Calculator

Estimate your solar potential with our quick sizing tool. Enter your roof details for instant generation and financial projections.

Site Setup

System Config

Review Results

Export

Input Completion0/8 fields valid (0%)

Postcode

Available Roof Area (m²)

Typical 3-bed semi: ~30m². Detached house: ~50-80m²

Roof Orientation

100% efficiency

Roof Pitch

30°

Flat (0°)Optimal (30-35°)Steep (60°)

Shading Level

No impact

Usable Roof Area

75%

Supply Phase Arrangement

Registered Inverter AC Capacity (kW)

Needed to assess G98 capacity eligibility. Left blank, the connection route is reported as not yet assessed.

Annual Consumption (kWh)

Find this on your annual energy statement or smart meter

Daytime Usage

35%

Away all day (20%)Home worker (50%+)With battery (70%+)

Your Electricity Rate (p/kWh)

Default

Typical: 18–37 p/kWh for your region

SEG Export Rate (p/kWh)

Save £210/year more with Octopus Energy!

Switch to 15 p/kWh export rate for better returns

Tip: Octopus Energy offers 15 p/kWh — one of the best rates!

System Cost Override (£)

GBP

Leave blank to use our size-scaled estimate