Solar panel efficiency is impacted by many things, but it’s mostly impacted by how they are manufactured. Some common factors that affect solar panel efficiency include: Type of wiring, Colour of the backing and Type of solar cells used. Obviously, the level of sunshine will also affect the efficiency of the panel. It’s good to remember that It is light that powers the panels, not heat. Call us on 07 3153 4178 if you have any questions on solar panel efficiency.