Solar panel performance can be affected by high temperatures, but in the UK it is rarely a major issue. Solar panels generate electricity from sunlight, and their efficiency typically drops as the temperature rises. This means a very hot day can produce slightly less power than a cooler sunny day, even if the sunlight is strong.
In most cases, the loss is small and the system still produces a useful amount of energy. Installers often consider ventilation and roof mounting to help keep panels cooler. The panels are designed to handle high temperatures, so overheating is not usually a safety concern. If a system is generating unusually low power on hot days, it is more likely to be a design or installation issue than the temperature itself.
