RNL Electrical & Renewable Energies Ltd

Long summer daylight partially compensates for lower irradiance

Donegal is Ireland's most northerly county, and while this means lower sun angles, it also means the longest summer days in the country. In mid-June, Malin Head experiences over 17.5 hours of daylight. This extended daylight significantly boosts summer generation, with June and July output in Donegal often surprisingly close to southern counties. The effect is reversed in winter, with very short days, making battery storage particularly valuable for Donegal households.