Statpower Portawattz 3000, Owner'S Manual, Page: 26 / 36

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6.1.7 ALARM Indicator
An audible alarm will sound when any of the following conditions
occur:
• OVERTEMP condition
• Low Battery Voltage (<10.7V)
• Low Voltage Shutdown (<10.0V)
6.2 Operating Limits
6.2.1. Power Output
The Portawattz 3000 will deliver up to 2500 watts or 22 amperes
continuously. It will deliver 3000 watts or 27 amperes for
approximately 5 minutes. The Portawattz must cool for 15
minutes before it can resume operation at 3000 watts. The
wattage rating applies to resistive loads such as heaters while
the current rating applies to reactive loads such as motors.
The Portawattz 3000 will operate most AC loads within these
ratings. Some induction motors require very high surge currents
to start. The Portawattz 3000 may not be able to start some of
these motors even though their rated current draw is within the
PROwatt’s limits. The Portawattz 3000 will normally start single
phase induction motors rated at 1HP or less.
If a motor refuses to start, observe the battery voltage indicator
while trying to start the motor. If the battery voltage indicator
drops below 11 volts while the Portawattz 3000 is attempting
to start the motor, this may be why the motor won’t start. Make
sure that the battery connections are good and that the battery
is fully charged. If the connections are good and the battery is
charged, but the voltage still drops below 11volts, you may
need to use a larger battery. See Battery Sizing notes in Section
4.2.
6.2.2. Input Voltage
The Portawattz 3000 will operate from input voltages between
10 volts and 15 volts. However, optimum performance is
achieved with input voltages between 12.0 volts and 14.0 volts.
If the voltage drops below 10.7 volts, the low battery warning
will sound and the voltage indicator will be in the lower red
zone. The Portawattz 3000 will shut down if the input voltage
drops below 10 volts. This protects your battery from being
over-discharged. The Portawattz will not restart unless the input
voltage exceeds 11 volts.