Thursday, 23 April 2026
Solar generation in Derry, Thursday, 23 April 2026
A brilliant solar day in Derry. A typical 4kW install would generate around 17.4 kWh today.
4kW system
Typical 3-bed NI home (10-12 panels)
17.4 kWh
£5.82 of electricity
6kW system
Larger home, EV owner, or heat pump
26.1 kWh
£8.73 of electricity
Weather on the day
- Sunshine
- 12.0 h
- Cloud cover
- 90%
- Max temp
- 17.0°C
- Solar radiation
- 5.57 kWh/m²
Want this generating on your roof?
Compare quotes from MCS certified installers in Derry. Free, no obligation, and homeowners save an average of £800 by comparing.
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.