Answer Posted / roshan khadka

In on-line UPS,the batteries are always connected with
inverter so that there is no power transfer switch between
them and load is always connected through inverter whether
there is power supply or power on.

In off-line UPS, load is connected directly with ac source
in normal operation and battery charging will be there
during that period. But in case of power failure,load is
connected to the inverter via power transfer switch between
battery and inverter.

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