Schumacher XI41DU - Manual (Page 6)

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Plug the device into the inverter AC outlet. 3.
Press and hold the ON/OFF 4. switch to turn the inverter on.
(The internal speaker will make a brief “beep”. This is normal.)
The Wattage out LED will glow and the digital display will
show .
Turn the device on. The display will now show the total 5.
wattage used by the device. To change the digital display,
press the Display button.
To disconnect, reverse the above procedure. 6.
NOTE: If more than one device is to be powered, start one device
at a time to avoid a power surge and overloading the inverter.
The surge load of each device should not exceed the inverters
Continuous Operation wattage rate.
If there is a short circuit or power surge in the
device,  will display and the alarm will sound. Press the ON/
OFF switch to turn off the alarm. If the  displays after several
attempts, there is a short circuit or the device requires more
“starting” or “peak” load than the inverter is capable of providing.
NOTE: After two  events the inverter will go into a mandatory 10
second cool down period before it will turn on again.
If you are using the power inverter to operate a
battery charger, monitor the temperature of the battery charger for
about 10 minutes. If the battery charger becomes abnormally
warm, disconnect it from the inverter immediately.
NOTE: You can use an extension cord from the inverter to the
device without significantly decreasing the power being generated
by the inverter. For best operating results, the extension cord
should be no longer than 50 feet.
Using the USB Port
The USB port provides up to 500mA at 5V DC.
Plug the device into the USB port. 1.
Press and hold the ON/OFF 2. switch to turn the inverter on.
(The internal speaker will make a brief “beep”. This is normal.)
Turn the USB device on. 3.
Reverse these steps when finished using the USB port. 4.