Unlike (the now crashed) Luna-25 lander, CH3 does not have a Radioisotope RTG that can provide heating and power during the lunar night.

Given that Chandrayaan-3 is at 69.37° S latitude, the maximum elevation is around 20°. Hence the near-vertical orientation of the solar panels on the lander and the rover. The Sun will disappear below the horizon and the mission will come to an end around Sep 4.