Schumacher XI41DU - Manual (Page 8)

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NOTE: The internal speaker may make a brief “beep” when the inverter is being
connected to or disconnected from the 12-volt power source.
Failure to make the correct connections will result in blown fuses
and permanent damage to the inverter.
OPERATiNG iNSTRUCTiONS 5.
Connect the inverter (see “CONNECTING INVERTER CABLES” section). 1.
Make sure the device to be operated is turned OFF. 2.
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 wattage used by the
5.
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.