Monday, 22 June 2026
Solar generation in Derry, Monday, 22 June 2026
A brilliant solar day in Derry. A typical 4kW install would generate around 18.8 kWh today.
4kW system
Typical 3-bed NI home (10-12 panels)
18.8 kWh
£6.31 of electricity
6kW system
Larger home, EV owner, or heat pump
28.2 kWh
£9.46 of electricity
Weather on the day
- Sunshine
- 11.6 h
- Cloud cover
- 82%
- Max temp
- 22.0°C
- Solar radiation
- 6.03 kWh/m²
Want this generating on your roof?
Compare quotes from MCS certified installers in Derry. Free, no obligation, and quotes for the same system routinely differ by more than £1,000.
Recent days in Derry
How we worked this out
We used daily shortwave radiation data for Derry from Open-Meteo and applied the standard PV yield model:
energy = radiation × system kWp × performance ratio.
The performance ratio is 0.78 (accounts for inverter and temperature losses, orientation and soiling).
Electricity is valued at 33.5p/kWh, the Power NI standard credit tariff.
Figures are an estimate based on observed conditions and a representative install. Actual generation varies with roof orientation, shading and hardware.