Because the panel is positioned such that it's is always exposed to the sun.

1: There is no night or day.

2: There are no seasons.

3: There is no weather.

Basically, the primary motivating factor of putting AI in space is abundant solar energy. Otherwise, AI in space makes little to no economic sense.

Hard to know, but there are some areas they are probably using:

* 24 hours of light vs. ~9 hours of light (e.g. winter)

* Panels perfectly perpendicular to sun 100% of the time vs. variable for fixed panels on earth

* No atmosphere

* No clouds

Presumably they get exactly the same amount of sunlight 100% of the time instead of a few hours peak on earth? I'd say 8x is in the right order of magnitude.