Solar charging efficiency depends on the intensity of direct sunlight and the number of daylight hours, even when the panel's placement (orientation and angle) is optimized.
In winter, sunlight is weaker than in summer, so panels receive less energy even during the same amount of sunlight hours. As a result, solar panels generate less electricity in winter.
Shorter winter days also mean fewer hours of charging time, which reduces the daily energy your panels can produce. In addition, winter weather (such as clouds, snow, or rain) can further limit the sunlight your panels receive.
These seasonal fluctuations are normal and temporary. Reduced solar charging performance in winter will not affect the long-term reliability of your camera’s solar charging system. If needed, you can bring the camera indoors and recharge it by plugging it in.