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G. ALARM Indicator
–
Audible alarms will sound off if any of the following conditions occur:
a) OVERTEMP condition
b) Low Battery Voltage : <10.7V
c)
Low Volt. Shutdown : <10.0V
6.2 Operating Limits
A. Power Output
The Sima STP-3000 delivers 2500 watts or 22.7 amperes continuously and about 3000 watts or 27.3 amperes for approximately 5 minutes. The Sima
STP-3000 must be cooled down for minimum 15 minutes before it resumes operation at 2500 / 3000 watts. Wattage rating is for resistive loads like
heaters while current rating is for reactive loads like motors.
It operates most AC loads within these ratings and will normally start single-phase induction motors rated at 1HP or less. It fails to start large inductive
motors due to huge starting currents.
If the battery voltage indicator drops below 11 volts when the Sima STP-3000 is attempting to start a motor, it would not start. Ensure proper battery
connections and being fully charged. Larger batteries may be needed if voltage still drops below 11 volts. See battery-sizing notes in Appendix A.
B. Input Voltage
The STP-3000 operates with input voltage between 10 ~15-volts. Its optimum performance ranges with input voltage between 12.0- and 14.0-volts.
Low battery warning will sound with the voltage indicator in the lower red zone when input voltage drops below 10.7 volts. Voltage below 10 volts shall
shut down the inverter in order to protect your batteries from being over-discharged. It takes an input voltage above 11-volts to restart the STP-3000
inverter.
Input voltage above 15-volts also shuts down the inverter so as to protect the unit from excessive input voltage. The voltage indicator will be in the
upper red zone. Avoid input voltages exceeding 16-volts as it may damage the inverter permanently.
7. Accessories
7.1 AC Receptacle option
The AC receptacle on front panel of the Sima STP-3000 inverter offers ready access to AC power for outputs limited to 1500 watts (15A) per outlet.
7.2 Remote ON/OFF switch option
This option allows the Sima STP-3000 inverter be turned on and off from a remote switch positioned up to 20 feet (6.1 meters) away, with push-button
and indicator light showing inverter status (See your SIMA dealer for more details on the STP-3000 Remote ON/OFF switch).
7.3 DC Box-Lug connectors
Available at electrical parts suppliers, box-lug connectors may be used in place of ring terminals.
7.4 Manual or Automatic Transfer Switch
To select between power sources from inverter, generator or utility power, use manual or automatic transfer switches. The double-pole, double-throw
(DPDT) switch breaks the load from one power source before making connections to another (See Section 5.2). Transfer switch is available from
marine and RV equipment dealers. Purchase only agency-approved switch that covers both ratings of the inverter and the other power source
7.4 Maintenance
Your Sima STP-3000 requires very little maintenance. Clean the exterior periodically with a damp cloth to prevent accumulation of dust and dirt,
especially for the air intake on the rear panel and exhaust slots on the front panel to remove accumulation of dust and dirt. Regular maintenance
check is recommended. Tighten screws on the DC input terminals periodically.
8. Troubleshooting
8.1 Common Problems
A. Buzz in Audio Systems
Portable stereo systems may not adequately filter the modified sine wave, thus producing buzzing noise from their loudspeakers when powered by
Sima STP-3000 inverter. Sound systems with higher quality power supplies are recommended.
B. Television Interference
Television reception may be interfered when operating the
Sima STP-3000
inverter. Observe the following steps to alleviate the problem:
1 Secure the chassis ground lug on the rear panel of the
Sima STP-3000
solidly to the ground system of your vehicle, boat and home.
2 Do not operate high power loads simultaneously while watching television.
3 Ensure the antenna feeding the television set with adequate (“snow free”) signal and that good quality cable feeding the television.
4 Keep a distance between the televisions from the
Sima STP-3000
inverter.
5 Minimize the cable length between the battery and the
Sima STP-3000
with twists so as to minimize the radiated interference from the
cables.
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