Schumacher PID-750 - Manual (Page 6)

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6. Turn the device ON.
7. To disconnect the PID-750, reverse the above steps.
NOTE: If there is a short circuit or power surge in the
device, the alarm will sound. To turn off the alarm, press
the button. Cycle inverter power OFF and ON. If problem
persists, use a larger inverter or a smaller device.
POWER SOURCE
Your average automobile or marine battery at full charge
will provide an ample power supply to the inverter for
approximately 3 hours when the engine is off. The actual
length of time the inverter will function depends on the age
and condition of the battery and the power demand being
placed by the device being operated with the inverter.
Turn OFF the device plugged into the inverter and the
inverter before starting the engine. To maintain battery
power, run the engine every 2 to 3 hours for approximately
10 minutes to recharge the battery. While the PID-750
draws very low amperage when not in use, it should be
unplugged to avoid battery drain.