Whistler XP800i Owner's Manual page 13

OPERATION
Don't Blow A Fuse.
This inverter is equipped with internal spade type fuses. With
reasonable care, it should not be necessary to replace the fuse(s)
in your inverter.
Most blown fuses are the result of reverse polarity or a short circuit
within the appliance or equipment being operated. If the fuse(s) does
blow, turn off and disconnect the appliance or equipment from the
inverter immediately, repair the related problem and replace the
fuse(s). The internal fuses are replaceable, however only electronic
knowledgeable people should attempt fuse replacement.
The Power Source.
When the engine is off, most batteries will provide ample power
to the inverter for one to two hours. The actual length of time
is a function of several variables including the age and condition
of the battery and the power demand being placed on it by the
equipment being operated with the inverter.
If you are using the inverter while the engine is off, we
recommend you start the engine every hour and let it run for at
least 10 minutes to recharge the battery. We also recommend
that the device plugged into the inverter be turned off before
turning over the engine.
Although it is not necessary to disconnect the inverter when turning
over the engine, the inverter may momentarily cease operation as
the battery voltage decreases. When the inverter is not supplying
power, and is turned on, it draws very low (<0.60 A).
11