Schumacher 71522 SEARS - Manual (Page 8)

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OPERATINg INSTRUcTIONS 4.
DC Outlet DC Plug
If connecting in a vehicle, remove the cigarette lighter from its outlet. 1.
Push the 12-volt power plug firmly into the outlet. 2.
The LED indicator light should glow GREEN verifying the inverter is 3.
receiving power.
Make sure the device to be operated is turned OFF.
4.
Plug the device into the inverter AC outlet or USB port. 5.
Turn the device on. 6.
To disconnect, reverse the above procedure. 7.
NOTE: You may hear a “buzzing” sound being emitted from inexpensive sound
systems when operated with the inverter. This is due to ineffective filters in the
sound system’s power supply. Unfortunately, this problem can only be resolved
by purchasing a sound system with a higher quality power supply or higher
quality filter.
POWER SOURcE 5.
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.
If you decide to use the inverter while the engine is off, we recommend you turn OFF
the device plugged into the inverter before starting the engine. To maintain battery
power, start the engine every 2 to 3 hours and let it run for approximately 10 minutes
to recharge the battery.
Although it is not necessary to disconnect the inverter when turning over the engine,
it may briefly cease to operate as the battery voltage decreases. While the inverter
draws very low amperage when not in use, it should be unplugged to avoid
battery drain.