OPTI-UPS PS7500DL - Manual (Page 16)

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8. OPERATION MODES OF THE UPS
8.1 UPS System Block Diagram
8.2 Normal Operation
There are two main loops when AC utility is normal: the AC loop and the battery
charging loop. The AC output power comes from AC utility input and passes
through static switch to support power to load. The battery charging voltage
comes from AC utility input and converted by AC/DC charger to support
battery-charging power.
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8.3 AC Utility Failure (Battery Mode)
The AC output comes from battery, passing through DC/AC inverter and static
switch within the battery backup time.