Schumacher XI41DU - Manual (Page 9)

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Using the inverter to Operate a TV or Audio device:
The inverter is shielded and filtered to minimize signal interference. Despite this,
some interference may occur with your television picture, especially with weak
signals. Below are some suggestions to try and improve reception.
Make sure the television antenna produces a clear signal under normal 1.
operating conditions (i.e. at home plugged into a standard 120-volt AC wall
outlet). Also, ensure that the antenna cable is adequately shielded and of
good quality.
Try altering the position of the inverter, antenna cables, and television
2.
power cord. Add an extension cord from the inverter to the TV so as to
isolate its power cord and antenna cables from the 12-volt power source.
Try coiling the television power cord and the input cables running from the
3.
12-volt power source to the inverter.
Affix one or several “Ferrite Data Line Filters” to the television power cord.
4.
Ferrite Data Line Filters can be purchased at most electronic supply stores.
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 6.
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.