It's also the reason for Night Glider Mode: https://en.wikipedia.org/wiki/Night_Glider_mode https://en.wikipedia.org/wiki/Night_Glider_mode Laying the panels '

It's also the reason for Night Glider Mode: https://en.wikipedia.org/wiki/Night_Glider_mode https://en.wikipedia.org/wiki/Night_Glider_mode Laying the panels 'flat' with regards to the orbit saves significant amounts of fuel. There's also a mode where they do the same during the day if there's a critical shortage of fuel.