For the start of the game, there needs to be a primitive battery capable of storing solar energy for use during the night.
In any game that features a solar cell as a power source, there is invariably a basic battery included for energy storage; the same should apply here.
The battery does not need to be efficient, compact, or inexpensive. However, it should be constructible using the basic starting resources (quartz, copper, titanium, and fibers).
To avoid worsening the balance with energy storage, a primitive battery could be made available. This could be as large as half a standard corridor, requiring a relatively large amount of raw materials to build, but having low efficiency, e.g., its capacity is only sufficient for one night with a consumption of 10/s.
To compensate for this, solar cells should also be set to produce no energy during the night.

already got power storage for that (2x salt, 1x germanium and 3 titanium i think)