Schumacher PI-1500 - Manual (Page 13)

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Blown Fuse
A blown fuse is usually caused by reverse polarity or a
short circuit within the device or equipment being operated.
If the fuse blows, take the inverter to a qualified techni-
cian for repair.
Power Source
Your average automobile or marine battery will provide an
ample power supply to the inverter for 30 to 45 minutes
even when the engine is off. The actual length of time the
inverter will function depends on:
1. Age and condition of the battery.
2. Power demand being placed by the equipment being
operated with the inverter.
If you decide to use the inverter while the engine is off:
turn oFF the device plugged into the inverter before
starting the engine. Start the engine every hour and let it
run for approximately 10 minutes to recharge the battery.
Attention: Although it is not necessary to disconnect the
inverter when starting the engine, it may briefly cease
to operate as the battery voltage decreases. When
the inverter is not supplying power, it draws a very low
amperage from the battery. The inverter may be left con-
nected to the battery for up to three hours. It is recom-
mended that the inverter always be disconnected when
not in use.