《Table 3 Allowable minimum EED bus voltage》

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《嫦娥四号中继星供配电系统设计与应用（英文）》

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Like other satellites，the SA current of Chang’e 4 relay satellite tends to decrease a little due to ultraviolet irradiation and charged particle irradiation.The SA current was about 27.2 A when the satellite reached its mission position.The SA current decreased to 26.3 A one year later equivalent to 3.3%of power loss.This phenomenon conforms to the normal behaviors of on-orbit SAs.Usually，the SA current decreases most in the first year and 1%to 2%current loss is expected every year in the future.So，it can be predicted that at least 24.2 A will still be available and the power issue will not be a problem to Chang’e4 relay satellite 4 years later.As to the battery，the discharging voltage of 7 cells is still higher than 3.7 V which is quite high above the alarm threshold with good uniformity after tens of times of orbital maintenance.Even if the battery decays 4 years later，we have alternative methods such as raising the battery voltage to store more energy，simply by issuing several commands via PCDU.The battery can rest us assured.