The composition of the emergency power supply EPS and UPS of the battery as the power supply energy is basically the same, and the main components are chargers, inverters, battery packs, controllers, etc.; EPS is mainly used as emergency lighting power supply and equipment emergency power supply; UPS is not allowed Special equipment for power outages guarantees power usage.

It should be noted that different types of emergency power supplies should be used for different loads and should not be mixed.
The advantages of battery emergency power supply are: no pollution to the environment, short power conversion time, especially the conversion time of UPS is recorded in ms, which can be considered as instantaneous conversion. The disadvantages are: the electric energy capacity is limited, the charging time is long, and it cannot be used for a long time.
For Class I and II buildings with two-way power supply, the power level is relatively high, and EPS as a backup power supply is actually only used as an emergency power supply or fire emergency power supply. The power supply time required by fire-fighting equipment in general projects is not too long, and the longest (the room that needs to be illuminated in case of fire) does not exceed 3 hours. In this case, using EPS is naturally a good choice; but if it is only one power supply. , Class II buildings, the backup (emergency) is used as a backup power source for non-fire-fighting loads such as elevators, domestic water pumps, and sewage pumps in most cases. The (emergency) power supply cannot meet the needs. Even if the number of batteries is increased, it still can only supply power for a limited time, and still cannot meet the needs of backup power.