Georator T3UPS-13-20K Instruction Manual page 8

Back-up Mode:
Since the batteries are connected directly to the DC bus, when the AC fails, the
batteries change immediately from receiver to donor, supplying energy to the inverter
instead of receiving energy from the rectifier. The output AC is not interrupted.
Therefore, the load connected to the output is protected.
Reserve Mode:
When the inverter is in an abnormal condition, such as over temperature, short circuit,
abnormal output voltage or overloaded for a period exceeding the inverter's limit, the
inverter will automatically shut down in order to protect itself from damage. If the
utility power is normal, the static switch shall transfer the load to the reserve source
without interruption of AC output.
1-3