Cotek SP-3000-112 High Frequency Pure Sine Wave Inverter User Manual

1. Introduction

This manual provides essential information for the safe and efficient operation of your Cotek SP-3000-112 High Frequency Pure Sine Wave Inverter. This device converts 12V DC power from batteries into 120V AC power, suitable for a wide range of electronic appliances. Please read this manual thoroughly before installation and use, and retain it for future reference.

2. Safety Information

Failure to follow these safety instructions may result in electric shock, fire, serious injury, or death. Always exercise caution when working with electrical equipment.

Read All Instructions: Before operating the inverter, read all instructions and cautionary markings on the inverter, the batteries, and all appropriate sections of this manual.
Qualified Personnel: Installation and servicing should be performed by qualified personnel familiar with batteries and inverters.
Ventilation: Ensure adequate ventilation around the inverter. Do not install in a zero-clearance compartment.
Avoid Water: Do not expose the inverter to rain, snow, spray, or bilge water.
Proper Grounding: The inverter must be properly grounded.
Battery Safety: Work near lead-acid batteries is dangerous. Batteries generate explosive gases during normal operation. Ensure proper ventilation and wear appropriate personal protective equipment.
Disconnect Power: Always disconnect the battery supply before performing any maintenance or troubleshooting.
Correct Voltage: Ensure the DC input voltage matches the inverter's specifications (12VDC for this model).

Illustration of a battery with a recycling symbol — Always handle batteries with care and ensure proper disposal.

Hard hat, safety glasses, and gloves on a wooden surface — Wear appropriate personal protective equipment during installation and maintenance.

3. Product Overview

3.1 Key Features

Pure sine wave output for sensitive electronics.
Power ON / OFF remote control capability (Green Terminal).
Input & output fully isolated for enhanced safety.
Temperature & load controlled cooling fan for optimal performance.
User-friendly interface with 3-color LED status indicators.
Multiple protection features: Reverse Polarity (Fuse), Under Voltage / Over Voltage, Output Protection (Short Circuit / Overload / Over Temperature).
E-13 / UL / CE / FCC approved.

3.2 Inverter Components

Cotek SP-3000-112 Pure Sine Wave Inverter, front-side view — **Figure 1:** Overall view of the Cotek SP-3000-112 Pure Sine Wave Inverter. This image shows the robust blue and grey casing, ventilation grilles, and the general form factor of the unit.

Rear panel of the Cotek SP-3000-112 Inverter showing AC outlet and controls — **Figure 2:** Rear panel of the inverter. Visible components include the hardwire AC output terminal, the main power switch (ON/OFF), LED indicators, DIP switches for settings, and an RJ45 port for remote control.

Front panel of the Cotek SP-3000-112 Inverter showing DC input terminals and cooling fan — **Figure 3:** Front panel of the inverter. This view highlights the heavy-duty DC input terminals (red for positive, black for negative), the chassis ground connection, and the cooling fan vents.

Close-up of the control panel on the Cotek SP-3000-112 Inverter — **Figure 4:** Detailed view of the control panel. This section includes the LED indicators (Power, Fault, Overload), DIP switches for configuration, the RJ45 remote control port, and the green terminal for remote ON/OFF control.

4. Setup and Installation

Proper installation is crucial for the safe and efficient operation of your inverter. Refer to local electrical codes and standards.

4.1 Placement

Install the inverter in a dry, well-ventilated area, away from direct sunlight, heat sources, and flammable materials.
Ensure sufficient clearance around the inverter for proper airflow, especially around the cooling fan vents.
Mount the inverter securely on a stable, non-combustible surface.
Avoid areas where dust, moisture, or corrosive fumes are present.

4.2 Wiring

All wiring must comply with applicable electrical codes and be performed by a qualified electrician.

Grounding: Connect the inverter's chassis ground terminal to a reliable earth ground using appropriate gauge wire.
DC Input Connection:
- Ensure the battery bank voltage is 12VDC.
- Use appropriately sized cables for the DC input to minimize voltage drop and ensure safety. Refer to cable sizing charts based on current and distance.
- Connect the positive (+) terminal of the battery bank to the red (+) terminal on the inverter.
- Connect the negative (-) terminal of the battery bank to the black (-) terminal on the inverter.
- Install a DC-rated fuse or circuit breaker between the battery bank and the inverter's positive terminal, as close to the battery as possible.
AC Output Connection:
- Connect your AC loads to the hardwire AC output terminal block.
- Ensure the total load does not exceed the inverter's continuous power rating (3000W).
Remote Control (Optional): Connect the remote control unit to the RJ45 port or use the green terminal for external ON/OFF control if desired.

5. Operating Instructions

5.1 Powering On/Off

To Power On: Ensure all DC and AC connections are secure. Flip the main power switch on the inverter's rear panel to the 'ON' position. The Power LED indicator should illuminate.
To Power Off: Disconnect all AC loads from the inverter. Flip the main power switch to the 'OFF' position.

5.2 LED Indicators

The inverter features 3-color LED status indicators on the control panel (refer to Figure 4) to provide operational feedback:

Green LED: Indicates normal operation and power output.
Yellow LED: Indicates a warning condition, such as low battery voltage or high temperature. The inverter may continue to operate but requires attention.
Red LED: Indicates a fault condition, such as overload, short circuit, or severe over/under voltage. The inverter will shut down to protect itself and connected devices.

5.3 DIP Switch Settings

The DIP switches on the control panel allow for customization of certain inverter parameters, such as output voltage, frequency, and power saving mode. Refer to the detailed specifications table (Figure 5) or the product datasheet for specific configurations. Always adjust DIP switches when the inverter is powered off.

6. Maintenance

Regular maintenance ensures the longevity and reliable operation of your inverter.

Cleaning: Periodically clean the exterior of the inverter with a dry cloth. Ensure ventilation openings are free from dust and debris. Do not use liquid cleaners.
Connections: Regularly check all electrical connections (DC input, AC output, ground) for tightness and corrosion. Loose connections can cause overheating and poor performance.
Battery Inspection: Inspect batteries for signs of damage, corrosion, or electrolyte leakage. Ensure battery terminals are clean and tight.
Environment: Verify that the operating environment remains within the specified temperature and humidity ranges.

7. Troubleshooting

This section provides solutions to common issues you might encounter. If the problem persists, contact customer support.

Problem	Possible Cause	Solution
Inverter does not turn on.	No DC input power; Loose battery connections; Blown DC fuse/breaker; Inverter switch OFF.	Check battery voltage; Tighten connections; Replace fuse/reset breaker; Turn inverter switch ON.
No AC output.	Overload; Short circuit; Over-temperature shutdown; Low/High DC input voltage.	Reduce AC load; Check for short circuits in wiring/appliances; Allow inverter to cool; Check battery voltage.
Yellow LED illuminated.	Low battery voltage warning; High temperature warning.	Recharge batteries; Ensure adequate ventilation, reduce load.
Red LED illuminated / Inverter shut down.	Overload; Short circuit; Over-temperature; Under/Over voltage.	Identify and correct the fault (e.g., reduce load, fix short, allow cooling, check battery voltage), then restart the inverter.
Cooling fan runs constantly or loudly.	High internal temperature due to heavy load or poor ventilation.	Reduce load; Improve ventilation around the inverter.

8. Specifications

The following table outlines the technical specifications for the Cotek SP-3000 Series Pure Sine Wave Inverter, specifically for the SP-3000-112 model.

Detailed specifications table for Cotek SP-3000 series inverters — **Figure 5:** Technical specifications for the Cotek SP-3000 Series, including the SP-3000-112 model.

Category	Parameter	SP-3000-112
Output	AC Voltage	100 / 110 / 115 / 120VAC ±5%
	Rated Power	3000W
	Surge Power (1 Sec.)	6000W
	Maximum Output Power (1 Min)	3450W
	Output Waveform	Pure Sine Wave (THD<3%)
	Frequency	50 / 60 Hz ±0.5%
Input	DC Voltage	12VDC
	Voltage Range	10.5 ~ 16.5VDC
	No Load Current	<3.0A@12VDC
	Power Saving Mode	<0.4A@12VDC
	Efficiency (Max.)	90%
Protection	Input Under - Voltage Protection	10.5 ±0.3VDC
	Input Under - Voltage Alarm	11.0 ±0.3VDC
	Input Under - Voltage Recovery	12.0 ±0.3VDC
	Input Over - Voltage Protection	16.5 ±0.3VDC
	Input Over - Voltage Recovery	14.5 ±0.3VDC
	Output Overload	Shutdown output voltage, restart to recover
	Output Short	Shutdown output voltage, restart to recover
Environment	Operating Temp.	-20°C ~ +40°C
Environment	Storage Temp. & Humidity	-30°C ~ +70°C, 10 ~ 95% RH
General	Dimensions (W x H x D)	442 x 214 x 102 mm (17.4 x 8.4 x 4.0 inches)
	Weight	8.2kg (18.1 lbs)
	Cooling	Temperature & load controlled cooling fan

Mechanical drawings with dimensions for Cotek SP-3000 series inverter — **Figure 6:** Mechanical drawings providing dimensional information for installation planning.

9. Warranty and Support

9.1 Warranty Information

The Cotek SP-3000-112 Pure Sine Wave Inverter comes with a 2-Year Manufacturer Warranty. This warranty covers defects in materials and workmanship under normal use. Please retain your proof of purchase for warranty claims.

9.2 Customer Support

For technical assistance, troubleshooting beyond this manual, or warranty inquiries, please contact Cotek customer support through their official website or your point of purchase. Provide your model number (SP-3000-112) and a detailed description of the issue to expedite service.

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COTEK SP-3000-112