Tripp Lite PINV750 Owner's Manual page 17

Operation
7. Switch the inverter's ON/OFF switch to the ON (I) position.
8. Turn the device on.
9. To disconnect, reverse the above procedure.
USB Charging Operation
The USB charging port is always ON. Connect your device to this port
for USB charging up to 2.0A. Remove your device from the USB port
when it has finished charging to reduce battery drain or start vehicle.
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