1. Introduction
The EPEVER IT-NC G3 Series MPPT Charge Controller is designed for off-grid solar systems that require both efficient solar charging and reliable DC load power. This advanced controller not only charges batteries efficiently but also directly powers DC loads, making it an ideal solution for various applications such as solar streetlights, RVs, boats, and remote monitoring systems.
With a charging capacity ranging from 50A to 100A, a high MPPT tracking efficiency of 99.9%, and dual PV input options (available on select models), this controller optimizes solar energy utilization. Certain models feature a built-in BLE Bluetooth module for convenient wireless monitoring via a mobile application. Its intelligent load control supports multiple operation modes, ensuring a stable power supply to DC devices. Remote monitoring is facilitated through an RS485 port, with optional Bluetooth, WiFi, or 4G modules for real-time data access.
Constructed with a durable all-metal die-cast housing and offering IP32 or IP43 protection, the IT-NC G3 is built for long-lasting performance in diverse off-grid environments. This MPPT controller provides smart, efficient, and versatile solar power management for reliable DC power in various settings.
2. Safety Information
Please read all instructions and warnings in this manual carefully before installation and operation. Keep this manual for future reference.
- Ensure all wiring is correctly polarized and securely connected to prevent damage.
- Always disconnect the solar array and battery power before installing or adjusting the controller.
- Use appropriate circuit breakers or fuses for the solar array, battery, and load circuits.
- Do not disassemble or attempt to repair the controller yourself. Contact qualified personnel for service.
- Install the controller in a well-ventilated area, away from flammable gases and moisture.
- Ensure the battery bank is properly ventilated to prevent gas accumulation.
- Wear eye protection when working with batteries.
3. Product Overview
3.1 Main Features
- MPPT Charge: Dual PV inputs (on some models), tracking efficiency ≥99.5%, conversion efficiency up to 98.5%.
- Constant Voltage Output Function: Enables direct load supply with sufficient PV energy without a battery.
- Multi-unit Parallel: Supports up to 6 units in parallel (with or without battery) for flexible system expansion.
- Battery Types: Provides stability and compatibility for various Lithium-ion and Lead-acid batteries (AGM, FLD, GEL).
- RTS/BMS Communication: Compatible with BMS-Link module or RTS-D47K temperature sensor for accurate charge/discharge control.
- Load Output: Features 6 control modes to suit multiple application scenarios.
- Built-in Bluetooth: Some models include a built-in Bluetooth module for convenient APP monitoring and management.
- Local Monitor: LCD screen allows setting most control parameters and monitoring system status.
- Remote Monitor: Isolated RS485 communication port for firmware upgrades and optional Bluetooth, WiFi, or 4G modules for wireless monitoring.
- Data Log: Real-time data, events, and accumulated power recording with 15000 storage capacity.
- Work Environment: Full load operation in -25~40℃; high temperature charging automatically reduces power.
- Low Static Loss: < 0.05A for long system standby time.
- Housing: All-metal die-cast housing with IP43 or IP32 protection level.
- Certifications: Designed with IEC62109, UL1741, EMC standard, providing comprehensive electronic protection functions.
4. Setup and Installation
4.1 Wiring Sequence
- Connect the battery to the charge controller.
- Connect the DC load to the charge controller.
- Connect the solar panel(s) to the charge controller.
WARNING: Always connect the battery first and disconnect the solar panel first to avoid damaging the controller.
4.2 PV Input Configuration
The IT-NC G3 series offers different PV input configurations based on the model:
- 50A / 60A / 75A models: Feature ONLY 1 PV input.
- 80A / 100A models: Support 2 PV inputs.
4.3 Multi-unit Parallel Connection
The controller supports up to 6 units working in parallel for flexible system extension. This can be done with or without a battery.
- In parallel applications, the PV side and load side of each controller must be independent.
- In the same parallel system, the product model must be the same, but the ID must be different.
- Parallel communication cable must be connected between parallel units, and the parallel communication ports of the first and last controllers need to be connected to the terminal resistor.
- Communication cable (CC-RJ45-RJ45-120) and terminal resistor (RJ45-CAN-R120) are optional.
- The parallel communication cables do not cross with the PV, battery input cables or AC output cables, otherwise the parallel communication may be interfered.
4.4 Charge Enable Terminal
The 'Charge Enable Terminal' is a standard accessory. When parameters 'CPE (COM Port Enable)' and 'ROT (Remote ON/OFF Terminal)' are set to ON, you can control PV charging by plugging or removing the 'Charge enable terminal'. When set to OFF, the PV of the device is valid for charging by default, and 'Charge enable terminal' cannot control PV charging or not. Users can maintain or replace battery by unplugging this terminal, and without changing PV connection, more simple and convenient. Battery (with dry contact output) can also control PV charging/discharging.
4.5 BMS and RTS Connections
- BMS-Link Module: For accurate charge/discharge control of Lithium batteries. The cable is an accessory of the BMS-Link module and needs to be customized according to the battery or made by clients.
- RTS-D47K Remote Temperature Sensor: Used for temperature compensation during charging/discharging of lead-acid batteries. The cable is optional and can be replaced by a standard parallel network cable. When connecting RTS-D47K, parameter 'BPRO (BMS Protocol)' should be set to '32' (by default).
5. Operating Instructions
5.1 Local Monitoring and Parameter Setting
The integrated LCD screen allows for convenient local monitoring of PV status, battery status, and load status. Most control parameters can be set directly via the LCD screen, eliminating the need for additional accessories. It also features a one-click restore factory default function.
5.2 Load Output Modes
The controller supports 6 load control modes to meet various application needs:
- Manual Mode: Load is controlled manually ON/OFF.
- Sunset Load ON Mode: Load turns on at sunset.
- Sunrise Load ON Mode: Load turns on at sunrise.
- Sunset Load ON + Timer Mode: Load turns on at sunset and stays on for a set duration.
- Timer Mode: Load turns on and off based on a set schedule.
- Always ON Mode: Load remains on continuously. Under Always ON Mode, the load can work 24 hours a day until the battery triggers the over-discharge protection.
5.3 Remote Monitoring
The isolated RS485 communication port allows for firmware upgrades and remote monitoring. Optional Bluetooth, WiFi, or 4G modules can be connected to achieve wireless monitoring and management via a mobile app or PC software.
5.4 Data Logging
The controller provides real-time data, event logs, and power recording with a 15000 storage capacity, ensuring full capacity cycle coverage. Data is not lost in case of power failure. Scada software (Solar Guardian) can be used to query and download historical data for statistics and analysis.
6. Maintenance
- Regular Inspection: Periodically check all wiring connections for tightness and corrosion.
- Cleaning: Keep the controller clean and free from dust. Use a dry cloth to wipe the surface. Ensure cooling fins are clear of obstructions.
- Firmware Updates: Check the manufacturer's website for available firmware updates to ensure optimal performance and access to new features. Updates can typically be performed via the RS485 port.
- Environmental Conditions: Ensure the installation environment remains within the specified operating temperature and humidity ranges.
7. Troubleshooting
The IT-NC G3 series incorporates multiple protection features to ensure system safety and reliability:
- Reverse Polarity Protection: Prevents damage from incorrect wiring of PV, battery, or load.
- Over Voltage Protection: Safeguards against excessive voltage from the solar array or battery.
- Over Discharging Protection: Prevents battery damage due to excessive discharge.
- Overload Protection: Protects the load circuit from excessive current.
- Over Temperature Protection: Reduces power or shuts down if the controller overheats.
- Short Circuit Protection: Protects against short circuits in PV, battery, or load circuits.
- Night Reverse Charging Protection: Prevents battery discharge back into the solar panels at night.
- Over Current Protection: Limits current to safe levels.
If you encounter issues, check the LCD display for error codes or warnings. Verify all connections are secure and correct. If problems persist, consult the full user manual or contact technical support.
8. Specifications
The following table provides detailed electrical and mechanical specifications for various IT-NC G3 models.
8.1 Comparison with other series
8.2 Work Environment and Power Derating
The controller is designed for full load operation in temperatures ranging from -25℃ to 40℃. At higher temperatures, the charging power will automatically reduce to protect the device.
8.3 Supported Battery Types
The controller provides stability and compatibility for various battery types, including Lithium-ion, AGM, FLD (Flooded), and GEL batteries.
9. User Tips
- Proper Sizing: Ensure your solar panel array and battery bank are appropriately sized for your controller's capacity to maximize efficiency and prevent damage.
- Ventilation: Always install the controller in a location with good airflow to prevent overheating, especially during high-power operation.
- Monitoring App: If your model supports Bluetooth, download the EPEVER monitoring app for convenient real-time data and remote control.
- Cable Gauge: Use the recommended cable gauges for PV, battery, and load connections to minimize power loss and ensure safety.
10. Warranty and Support
EPEVER products typically come with a standard manufacturer's warranty. Please refer to the warranty card included with your product or visit the official EPEVER website for detailed warranty terms and conditions.
For technical support, troubleshooting assistance, or service inquiries, please contact your authorized EPEVER dealer or the EPEVER customer service department. Have your product model and serial number ready when contacting support.
