Statpower Portawattz 3000, Owner'S Manual, Page: 29 / 36

25
Problem and
symptoms
Possible Cause Solution
Low output voltage
(96Vac to 104Vac) Using an average
reading voltmeter
Use true RMS reading
meter. See section 2.2
of manual
Low output voltage and
current indicator in red
zone
Overload Reduce load
No output voltage and
voltage indicator in lower
red zone
Low input voltage
Recharge battery, check
connections and cable
No output voltage, no
voltage indication
1. Inverter switched OFF
2. No power to inverter
3. Internal fuse open
4. Reverse DC polarity
1. Turn inverter ON
2. Check wiring to
inverter. Check battery
fuse.
3. Have qualified service
technician check and
replace.
4. Have qualified service
technician check and
replace fuse, observe
correct polarity.
No output voltage,
voltage indicator in
upper red zone
High input voltage
Make sure unit is
connected to 12V
battery, check regulation
of charging system.
Low battery alarm on all
the time, voltage
indicator below 11 volts
Poor DC wiring, poor
batter condition
Use proper cable and
make solid connections.
Charge battery or use
new battery
No output voltage,
OVERTEMP indicator
ON, load in excess of
2500 Watts/250 ampere
input current
Thermal shutdown
Allow unit to cool down.
Reduce load if
continuous opertion
required.
No output voltage,
OVERTEMP indicator
ON, load less than 2500
Watts/250 ampere input
current
Thermal shutdown
Improve ventilation,
make sure ventilation
openings in unit are not
obstructed, reduce
ambient temperature.
No output voltage,
OVERLOAD indicator ON
1. Short circuit or wiring
error
2. Very high power load
1. Check AC wiring for
short circuit or improper
polarity (hot and neutral
reversed)
2. Remove or reduce
load.
8.2 Troubleshooting Guide