MEAN WELL NTN-5K Series 5KW True Sine Wave Inverter with AC Charger / UPS

Features

• Combines AC/DC charger, DC/AC inverter, AC by-pass & support external MPPT solar charger.
• AC utility charger up to 4520W.
• UPS function (AC by-pass) with interruption transfer time <10ms.
• True sine wave output (THD<3%).
• High surge power up to 10KW.
• Parallel synchronized operation up to 30KW (5+1 unit).
• Temperature controlled cooling fan.
• AC output voltage and frequency selectable by DIP S.W.
• Protections: Input (Reverse polarity, DC low alarm/shutdown, Over voltage), Output (Short circuit, Overload, Over temp.), Battery (Over discharge protection).
• -30℃~+70℃ wide operating temperature range.
• Suitable for lead-acid or li-ion batteries.
• Supports MODBus-RTU (RS-485) or CANBus protocol communication.
• Graphical user interface controller CMU2E/CMU2E-R for status monitoring and control.
• Conformal coating.
• 5 years warranty.

Description

The NTN-5K is a 5KW highly reliable off-grid true sine wave DC-AC power inverter with built-in AC charger and UPS function (AC by-pass). It offers digital design with MCU control, streamlined control circuitry for quick response to environmental changes, high-quality fan with low acoustic noise, 10KW peak power, adjustable AC output voltage and frequency, and a wide operating temperature range of -30~+70°C. It is suitable for residential, commercial, marine, automobile, mine, construction sites, and remote areas without utility power. The output can power various devices including fans, TVs, radios, phone chargers, PC/laptops, lighting, induction stoves, air conditioners, electromechanical tools, communication equipment, and more.

Applications

• Home and office appliances
• Power tools
• Portable equipment
• Vehicles
• Yachts
• Off-grid solar power systems
• Wireless networks
• Telecom or datacom systems

Model Encoding

The model number follows the format: NTN - 5K - [DC Input Voltage] - [AC Output Voltage] - [Communication Protocol Option]

Specifications

Derating Curve

The derating curve illustrates the relationship between ambient temperature and the maximum allowable load percentage for the inverter. As the ambient temperature increases, the maximum load capacity decreases to prevent overheating.

Ambient Temperature vs. Load Percentage:

• At 25°C, 100% load is supported.
• At 40°C, approximately 80% load is supported.
• At 70°C, approximately 50% load is supported.

The derating curve also shows the relationship between DC input voltage and load percentage. Higher DC input voltages generally allow for higher load percentages.

Charging Curve

The NTN-5K features a 3-stage charging process for lead-acid and li-ion batteries:

• Stage 1 (Constant Current): The charger delivers a constant current to rapidly charge the battery.
• Stage 2 (Constant Voltage): The voltage is held constant while the current gradually decreases as the battery approaches full charge.
• Stage 3 (Float): A lower constant voltage is maintained to keep the battery fully charged without overcharging.

The charging voltage and current settings are adjustable via MODBus/CANBus communication. Specific default values for different models (e.g., NTN-5K-124, NTN-5K-224) are provided in the specification table.

Block Diagram

The block diagram illustrates the system configuration. The NTN-5K acts as the central component, connecting to solar panels (via an external MPPT charger), a battery bank, and the AC utility. It provides DC/AC inversion for loads and can also function as an AC/DC charger when AC utility is available. The system includes bidirectional DC/DC conversion and bidirectional inverters, managed by MCUs. Communication options include MODBUS or CANBUS.

Function Manual

1. Support MODBus / CANBus Communication

The inverter supports both MODBus (RS-485) and CANBus communication protocols, allowing for remote monitoring and control. Connection is typically made via a communication cable to a personal computer.

2. Remote ON/OFF Control

The unit can be remotely turned ON/OFF using a dry contact connection. Shorting the PAR1/PAR2 pins (Pin 1 to 3) results in AC output ON, while opening the pins results in AC output OFF.

3. AC Output Voltage, Frequency, Power Saving Mode Selectable by DIP SW

DIP switches (SW1 and SW2) on the unit allow for selection of AC output voltage (e.g., 100/110/115/120Vac or 200/220/230/240Vac), frequency (50Hz or 60Hz), and power saving mode (Saving mode or Non-Saving mode).

4. 3Ø 4-wire and 1Ø 3-wire AC Output Voltage Connection

The NTN-5K series supports both three-phase 4-wire and single-phase 3-wire output configurations. DIP switches are used to select the phase connections and output voltage.

5. Temperature Compensation (3 stage only)

For lead-acid batteries, a temperature compensation feature is available to prolong battery life. An external NTC sensor can be connected to the unit to adjust the charging voltage based on battery temperature. The compensation range is 0~40°C.

6. AC Output Parallel Function

The NTN-5K features built-in active current sharing, allowing up to 6 units to be connected in parallel for higher AC output power. Proper wiring and connections are crucial for parallel operation. The maximum output current in parallel operation is 95% of the rated current per unit multiplied by the number of units (for fewer than 6 units).

LED Status

The unit is equipped with LEDs to indicate its operational status:

• Normal Work: Green (Inverter OK), Orange (Remote off / Saving mode).
• DC Input Status: Indicates voltage levels (e.g., 25-31Vdc, 50-62Vdc, 335-420Vdc for Green).
• Load Status: Indicates load percentage (e.g., <40% load for Green in Inverter Mode).
• AC Input Status: Indicates utility status (e.g., Utility OK for Green).

Abnormal Status Indications:

• Output overload or AC output short circuit: Indicated by a red LED for DC Input and Load.
• Abnormal DC voltage: Indicated by a red LED for DC Input.
• Over temperature or Fan lock: Indicated by a red LED for DC Input and Load.
• Inverter fail: Indicated by a red LED for DC Input and Load.

Mechanical Specification

Detailed dimensions and mounting instructions are provided, including terminal pin assignments for AC input, communication, control, and parallel connections. The unit dimensions are 460*211*83.5mm (L*W*H).

Accessory List

Standard accessories include an NTC sensor wire and mating wire for temperature compensation, and mating wires for Power ON/OFF control. Terminal protectors are also included.

Typical Application

The NTN-5K series is suitable for various applications, including:

• Residential: Powering home appliances with solar energy or as a UPS backup.
• Marine: Providing power on yachts and boats.
• Recreational Vehicles (RVs): Offering off-grid power solutions.

System Configuration

The system configuration shows how the NTN-5K integrates with solar panels, battery banks, and AC utility sources to provide power to various loads such as household appliances, ATM machines, and monitoring systems.