Schumacher 71495 5SEARS - Manual (Page 10)

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USING THE USB PORT
The USB port provides up to 2.1A at 5V DC.
1. Plug the device into the USB port.
2. Turn the USB device on.
3. Reverse these steps when finished using the USB port.
WARNING: The inverter draws power, even when the switch is OFF.
To avoid battery drain, disconnect the inverter when not in use.
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.
Before starting the engine after using the inverter with the engine off, turn OFF
the device plugged into the inverter and disconnect the inverter plug from the
12 volt accessory outlet. 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, unplug it to avoid
battery drain.
HOW POWER INVERTERS WORK
There are two stages involved in transforming 12 volt DC (battery) power into
120 volt AC (household voltage):
STAGE 1: The power inverter uses a DC to DC transformer, to increase the
12 volt DC input voltage from the power source to 145 volt DC.
STAGE 2: The inverter then converts the 145 volt DC into 120 volt AC
(household voltage) using advanced MOSFET transistors in a full bridge
configuration. A “modified sine wave” waveform is generated by this conversion.
LED DISPLAY
The LED display identifies the current status of the inverter.
VOLTS IN: The voltage of the vehicle’s battery, Portable Power jump starter or
DC power source.
VOLTS OUT: The voltage supplied to the device through the AC receptacle.
OUTPUT WATTAGE: The power or wattage supplied to the device plugged
into the inverter.
An audio alarm will sound when any of the following codes display. To stop the
alarm, press the ON/OFF switch: