Solar Panel Output by Season

How much do solar panels produce each season?

UK solar output varies dramatically by season. A 4kW system (UK Midlands): Spring (Mar-May): 1,020 kWh (28%). Summer (Jun-Aug): 1,470 kWh (40%). Autumn (Sep-Nov): 690 kWh (19%). Winter (Dec-Feb): 330 kWh (9%). The summer-to-winter ratio is approximately 5:1. This seasonal pattern is completely predictable — all savings estimates account for it. Batteries become more valuable in autumn/winter when every kWh matters more.