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The offline UPS is a type of UPS that functions as a backup power source to provide an uninterrupted power supply to various devices and equipment when there is a power failure happened. It directly supplies the AC mains power to the load.
In normal conditions, it directly supplies the power from the AC mains to the AC load through a static transfer switch. Besides, the AC is converted into DC by a rectifier and then charges the battery through a charge controller. Therefore, there are two separate lines for power supplies and both lines need to pass through the transfer switch. Because the power supply is normal so the inverter doesn’t draw current from the battery flowing to the AC load.
In abnormal conditions, the basic supply power from AC mains is interrupted, so the battery now will stop charging and the inverter will draw DC power from the battery to convert to AC and provide power to the AC load through the static transfer switch.
The speed of the offline UPS switch is around 4-5ms and it’s enough to keep a computer from shutting down. But for the sensitive equipment such as in hospitals, this switching time is deadly to keep a smooth operation.
The reason why it’s called Offline UPS is that because the switch is off to draw current from the battery to the AC load which is very different to online UPS that the output power supply always stays ON and needs zero time to switching.
Computers, printers, scanners, consumer electronics, POS systems, security systems.
Emergency power supplies.
Follow these steps and you will clearly know what is an Offline UPS and choose the right UPS fits into your working or living condition.