09 June 2021
Both the Tianhe core module and the Tianzhou cargo craft are equipped with independent power supply systems. After docking, the two systems can form a connected energy system and achieve mutual transmission of electric power. 3 sets of lithium ion batteries power the entire Tianzhou 2 cargo craft when the combination enters the shadow areas. The solar panels work again after it moves into the sunlight, and continue supplying power and charging. Tianhe is powered by 3rd-generation flexible GaAs (gallium arsenide) solar panels, which provide high power output, are light, small when folded, have long in-orbit life, and can be repeatedly folded and unfolded.
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