Samlexpower PST-3000-12 User Manual (English)

Questions and Answers:

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michael25Aug 12, 2025
Why does my Samlexpower Inverter AC output shut down and the red overload LED is on?
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  Raymond SolomonAug 13, 2025
  The AC output may shut down completely, the red overload LED lights up, and the buzzer sounds because of a continuous overload (110% to 115% for 2 to 2.5 seconds) or a short circuit on the AC load circuit (AC output voltage at 80VAC or lower for 1 to 1.5 seconds). To solve this: * Reduce the load or remove the short circuit. * If the load requires higher power, use an inverter with a higher power rating. To reset the inverter, switch it OFF, wait 3 minutes, and then switch it ON again. Ensure the cause of the shutdown is removed before switching it back on.
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Travis KingAug 16, 2025
What to do if my Samlexpower Inverter has no AC output and the GFCI green light is off?
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  David TrujilloAug 17, 2025
  If your Samlexpower Inverter has no AC output, but the green LED is lit and the GFCI green light is off, it means the GFCI has tripped due to leakage or a neutral-to-ground bond on the load side. Check the load side circuits for leakage or neutral-to-ground bonding and correct the issue. Then, press the "Reset Button" on the GFCI to reset it. Make sure the inverter is ON before resetting the GFCI.
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Mark FrancoAug 20, 2025
How to fix Samlexpower Inverter if there is no AC output and the over temp LED is on?
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  Maria DorseyAug 20, 2025
  If your Samlexpower Inverter has no AC output, the red "OVER TEMP" LED is lit, and the buzzer is sounding, it indicates a shutdown due to over temperature. This can be caused by fan failure or inadequate cooling because of high ambient temperature or insufficient air exchange. Here’s what to do: * Verify that the fans are working. If not, the fan control circuit may be defective and you should call Technical Support. * If the fans are working, ensure that the ventilation slots and openings are not obstructed. * Confirm that enough cool replacement air is available and that the ambient air temperature is less than 40ºC. * Reduce the load to decrease the heating effect. After addressing the cause of overheating and the unit cools down, it will reset automatically.
J
Jennifer ElliottAug 25, 2025
Why is my Samlexpower PST-3000-12 Inverter beeping with no load when I turn on the load?
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  Karen Palmer MDAug 25, 2025
  The buzzer alarm sounds on your Samlexpower Inverter when the load is switched on, while the green "POWER" LED is lit and the GFCI indication light is green, it indicates a low DC input voltage alarm. This occurs when the DC input voltage is 10.7V or lower (but > 10V ± 0.1V for PST-3000-12) or 21.4V ± 0.2V or lower (but > 20V ± 0.2V for PST-3000-24). To resolve this: * Check that the battery is fully charged. Recharge if it's low. * Ensure the battery cables are thick enough to carry the required current for the distance needed; use thicker cables if necessary. * Tighten all connections in the battery input circuit.
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trussoAug 27, 2025
What to do if my Samlexpower PST-3000-12 Inverter has no AC output and is beeping?
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  Daniel BeckerAug 27, 2025
  If your Samlexpower Inverter has no AC output, the buzzer is sounding, the green "POWER" LED is lit, and the GFCI green light is off, it indicates that the AC output voltage has been shut down due to low DC input voltage. This happens when the DC input voltage is 10V ± 0.1V or lower for PST-3000-12, or 20V ± 0.2V or lower for PST-3000-24. Solutions include: * Check that the battery is fully charged and recharge if necessary. * Ensure the battery cables are thick enough for the current and length required; use thicker cables if needed. * Tighten the connections of the battery input circuit. The AC output voltage will automatically switch back on when the DC input voltage rises to 11.5V ± 0.1V or higher for PST-3000-12, or 23V ± 0.2V or higher for PST-3000-24.
T
treyesAug 31, 2025
Why Samlexpower PST-3000-12 is not working when switched on?
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  youngkellySep 1, 2025
  If your Samlexpower Inverter doesn't turn on (no green "POWER" LED, buzzer off, no AC output, GFCI light off), it could be due to: * No voltage at the DC input terminals: Check the continuity of the battery input circuit, ensure the battery fuses are intact (replace if blown), and verify all connections in the battery input circuit are tight. * Reversed DC input voltage polarity: Check external and internal fuses. Replace them if blown. If it still doesn't work, call Technical Support for repair.
R
rodriguezjamesSep 4, 2025
Why Samlexpower PST-3000-12 Inverter shuts down due to high DC voltage?
- S
  Steven WilliamsSep 4, 2025
  The Samlexpower Inverter may shut down with no AC output, the buzzer on, and the green "POWER" LED lit because of high input DC voltage (16.5V or higher for PST-3000-12 and 33V or higher for PST-3000-24). To resolve this: * Check that the voltage at the DC input terminals is less than 16.5V for PST-3000-12 and less than 33V for PST-3000-24. * Ensure the maximum charging voltage of the battery charger, alternator, or solar charge controller is below 16.5V for PST-3000-12 and below 33V for PST-3000-24. * If using a solar panel, use a charge controller between the solar panel and the battery. The unit will automatically reset when the voltage drops to < 16.5V for PST-3000-12 or < 33V for PST-3000-24.
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Michael LeSep 8, 2025
How to troubleshoot low AC output voltage on Samlexpower Inverter?
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  Tristan WilliamsSep 8, 2025
  A low AC output voltage (without a buzzer alarm) on your Samlexpower Inverter can be caused by the AC load exceeding 200% surge overload or approaching 200% surge overload during lower DC input voltage. To resolve this: * Ensure the battery is fully charged. Recharge if necessary. * Check that the battery cables are thick enough to carry the required current over the required length. Use thicker cables if needed. * Tighten all connections of the battery input circuit. * Reduce the load.

Samlexpower PST-3000-12 Specifications

General

Brand	Samlexpower
Model	PST-3000-12
Category	Inverter
Language	English

Summary

Safety Instructions

Important Safety Instructions and Symbols

Key safety symbols and general instructions for safe operation.

General Safety Instructions

Essential safety guidelines for installation, wiring, and electrical shock prevention.

Inverter Related Safety

Safety measures specific to the inverter, including preventing AC output paralleling.

DC Input Safety Precautions

Guidelines for preventing DC input over-voltage and reverse polarity.

DC Input Circuit Protection

Explains the necessity and use of external fuses in the DC input circuit.

AC Output Wiring Safety

Safety considerations for hardwiring AC output to vehicle panelboards.

General Information

Definitions of Electrical Terms

Defines fundamental electrical concepts like RMS, voltage, current, and frequency.

Power Calculations and Definitions

Explains power types (Active, Reactive, Apparent) and power ratings.

Load Types and Power Factor

Describes linear, resistive, reactive loads and the concept of power factor.

Output Voltage Waveforms

Illustrates and describes pure sine wave vs. modified sine wave output voltage characteristics.

Pure Sine Wave Inverter Benefits

Lists advantages of pure sine wave output over modified sine wave.

Devices Incompatible with Modified Sine Wave

Identifies devices that may malfunction or be damaged by modified sine wave.

Inverter Power Rating Explanation

Clarifies how inverters' continuous and surge power ratings are specified.

Inverter Sizing Factor Table

Provides a table of sizing factors for various appliances to select an inverter.

Limiting Electro-Magnetic Interference (EMI)

EMI and FCC Compliance

Discusses EMI generation by inverters and compliance with FCC standards.

Reducing EMI Through Proper Installation

Offers tips for minimizing EMI effects through correct installation practices.

Powering Switch Mode Power Supplies (SMPS)

Characteristics of Switched Mode Power Supplies (SMPS)

Explains the nature of SMPS, focusing on inrush current behavior.

SMPS Inrush Current and Crest Factor

Illustrates SMPS inrush current and high crest factor with diagrams.

Principle of Operation

General Operation

States the inverter's basic function: DC to AC conversion.

Pure Sine Wave Output Waveform

Describes the characteristics of the pure sine wave output voltage.

Principle of Operation Stages

Details the two-stage process of DC to AC voltage conversion.

Unit Layout and Dimensions

Unit Layout Overview

Shows front, back, and compartment layouts with component references.

Overall Dimensions

Displays the physical dimensions of the PST-3000 inverter in mm.

General Information on Lead Acid Batteries

Deep Cycle Lead Acid Batteries

Explains the suitability and characteristics of deep cycle batteries for inverters.

Rated Capacity Specifications

Defines battery capacity in Ampere-hours (Ah) and Reserve Capacity (RC).

Charging and Discharging Currents (C-Rate)

Explains C-Rate for specifying battery discharge currents and capacity.

Charging/Discharging Curves

Illustrates battery voltage vs. state of charge at different C-Rates.

Usable Capacity vs. Discharge Rate

Details how usable battery capacity decreases at higher discharge rates (Peukert Effect).

State of Charge (SOC) and Voltage Alarms

Explains how standing voltage indicates SOC and inverter low voltage alarms.

Battery Connection Methods

Illustrates series, parallel, and series-parallel battery bank configurations.

Sizing the Inverter Battery Bank

Provides formulas and steps to calculate the required battery bank size.

Charging Batteries

Recommends battery charging methods and stages for lead-acid batteries.

Installation

Location of Installation Requirements

Specifies environmental conditions for safe and optimal inverter installation.

Mounting Orientation

Details recommended and prohibited mounting orientations for safety.

DC Side Connections

Covers DC input over-voltage prevention and reverse polarity protection.

Battery Cable and Fuse Sizing

Explains sizing of DC cables and fuses for battery connections.

AC Side Connections

Covers AC output paralleling, neutral grounding, and GFCI connections.

AC Output Wiring and Breaker Sizing

Specifies wiring and breaker sizes for AC output connections.

Grounding to Earth

Details how to properly ground the inverter chassis for safety.

Remote Control Setup

Explains the setup for the optional wired remote control and ON/OFF controls.

Operation

Switching the Inverter On/Off

Describes how to turn the inverter on and off using the front panel switch.

Powering On Loads

Guides on the correct sequence for switching on loads after powering the inverter.

Temperature Controlled Cooling Fan

Explains the function and operation of the inverter's cooling fan.

Indications for Normal Operation

Describes the LED indicators for normal inverter operation.

No Load Draw (Idle Current)

Explains the small current drawn when the inverter is on but not supplying load.

Protections

Surge, Overload, and Short Circuit Protection

Details how the inverter protects against power surges, overloads, and shorts.

DC Input Voltage Protections

Covers low DC voltage alarms, shutdowns, and high DC voltage shutdown.

Over-Temperature Shut Down

Explains the inverter's protection against overheating.

AC Output Protections

Describes AC output protection mechanisms like GFCI and internal fuses.

Troubleshooting Guide

Troubleshooting Power and Output Issues

Addresses issues like no power, low AC output, and DC input voltage alarms.

Troubleshooting Overload and Voltage Issues

Covers overload shutdowns, voltage protection issues, and GFCI trips.

Specifications

Technical Specifications Overview

Lists detailed technical specifications for the inverter models.

Fire Risk Warning for Vehicle Fuses

Warns against using vehicle fuses with higher ratings than recommended.

Warranty

3 Year Limited Warranty

Outlines the terms and conditions of the limited warranty for the product.

Related product manuals

Samlexpower PST-300-12

68 pages

Samlexpower PST-600-12

48 pages

Samlexpower PST-120-12

9 pages

Samlexpower PST-1000-12

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Samlexpower SAM-250-12