*4.1. Temperature*

The temperature outdoors and that inside of the cabinet is shown in green and blue respectively. The temperature inside can be higher by as much as 10–15 ◦C due to direct sunlight and self-heating by the power station. In the winter, the outdoor temperature fell below 10 ◦C, while it was always higher than 20 ◦C inside with the power station in operation except for a short time from a cold start. In the summer, the maximum outdoor temperature reached 40 ◦C while it rose to 50 ◦C inside the cabinet.
