Rectifier : this part of the UPS converts the incoming alternating current (ac) supply to direct current (dc) and can provide charging current for the battery and also the supply requirements for the inverter.
Charger : in a number of UPS systems due to the nature of their design a separate battery charger is used, this is more common on sub 60kVA UPS systems and is very common on small sub 3kVA units.
Battery : this is the power storage section and is kept charged either by the rectifier or a separate charger. Its storage capacity is generally displayed, as AH (ampere hour), which is the number of amperes of current that the battery can supply for an hour. There will be a number of limiting factors depending upon the application, typically if the design calls for a short autonomy (length of time the battery will support its load for), the batteries can be discharged to a lower level, in the case of emergency lighting where there is a requirement for a long autonomy the battery will not be allowed to discharge so far. These conditions help to allow the maximum design life of the battery to be achieved.
Inverter : this section of the Uninterruptible power...
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