ET/IT-NC G3 Solar Charge Controllers-the New Generation
- 24 January 2025
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ET/IT-NC G3: The New Generation of High-Current Solar Charge Controller
ET/IT-NC G3 Overview
The ET-NC G3 series and IT-NC G3 series are high-current MPPT solar charge controllers designed for solar systems, but they offer different functionalities to suit varying energy needs. The ET-NC G3 focuses exclusively on charging, while the IT-NC G3 provides both charge and discharge capabilities, including a crucial load output function. Additionally, the constant voltage output feature enables direct load supply when sufficient PV energy is available, ensuring efficient energy utilization.
These controllers feature a durable metal die-cast shell, engineered to withstand harsh environments and ensure long-lasting durability. They can even run in battery-free mode, making them great for setups where energy is used directly without storage. With CAN communication and BMS support, they easily connect to lithium batteries and ensure smooth system monitoring. Some models also support dual MPPT inputs, maximizing solar energy capture and working well with larger or more complex systems.
The ET-NC G3 and IT-NC G3 deliver outstanding performance. With MPPT tracking efficiency over 99.5% and conversion efficiency up to 98.5%, they make the most of your solar energy. These controllers are ideal for RVs, boats, industrial systems, or small to medium setups, providing reliable and efficient solutions for your power needs.
Whether you need a simple charger like the ET-NC G3 or a complete energy management system with load output like the IT-NC G3, these controllers make solar power easy and reliable.
ET/IT-NC G3 Solar Charge Controller Features:
System Specifications
- Supported System Voltages: 12V/24V/36V/48V
- ET-NC Charging Current: 50A–100A; IT-NC Charge/Discharge Current: 50A–100A
- Battery Compatibility: AGM, Gel, Flooded, LiFePO4 batteries, etc.
Efficiency and Performance
- MPPT Tracking Efficiency: 99.9%
- Conversion Efficiency: 98.5%
- Constant Voltage Output Function: Enables direct load supply with sufficient PV energy
- Support Two PV Inputs
(1)ET10420NC G3 supports two PV inputs
(2)IT10415NC G3, IT10415NC G3 BLE, IT10420NC G3 and IT8420NC G3 support two PV inputs
Durability and Protection
- All Metal Die-Casting Shell, IP43(IP32 without terminal cover)
- EMC Compliant: CLASS B
Communication Interface with Electrical isolation
- CAN Communication: Parallel operation of up to 6 devices (with or without batteries)
- BMS Communication: Ensures reliable lithium battery charge/discharge management
(Directly communicates with EPEVER batteries; Requires BMS-LINK module for others)
- RS485 Communication: Optional Bluetooth(4), WiFi, or 4G modules
(Only IT-NC models with the BLE suffix have integrated Bluetooth)
Monitoring and Data Management
- Real-time Data Logging
- Event Logging
- Power Statistics
ET/IT-NC G3 interface overview:
The LCD display on the ET/IT-NC G3 series controllers is divided into three main sections:
- PV Array: Shows the status of the solar panels, including input voltage, current, power, and energy for PV.
- Battery (BATT): Indicates battery performance through signal light color changes, allowing users to easily monitor the battery’s status.
- Load (LOAD) -IT-NC Series Only: Indicates the load status through signal lights, showing whether the load is ON or OFF. This feature provides users with a quick and easy way to monitor the operation of connected devices.
The indicators on the device are designed to provide real-time feedback on the system’s performance and health. These visual signals help users monitor the status of the PV input and battery, ensuring that all components are functioning as expected. With clear color codes and flashing patterns, the indicators make it easy to identify key states such as normal operation, charging progress, and battery conditions.
In addition to showing standard operations, the indicators alert users to potential issues, including PV overvoltage, low battery levels, temperature extremes, and BMS-related faults. For example, they can signal whether the battery is fully charged, in protection mode, or experiencing critical conditions like over-discharging or communication errors. The integration of dual indicators also highlights serious problems, such as equipment overheating or DSP communication failures, ensuring prompt attention to maintain system safety.
By offering immediate and intuitive visual feedback, these indicators enhance the system’s usability, allowing users to quickly assess the status and address any issues for optimal performance and reliability.
ET-NC G3 solar charge controller interface
❶ | Indicator | ❿ | COM: RS485 COM port (RJ45, with isolation design, 5VDC/200mA) |
❷ | LCD | ⓫ | RTS/BMS COM interface |
❸ | Buttons | ⓬ | CAN-PARA In: Parallel COM input port for multiple controllers (RJ45, with isolation design) |
❹ | Protective cover hole (M4) | ⓭ | CAN-PARA Out: Parallel COM output port for multiple controllers (RJ45, with isolation design) |
❺ | PV2 terminals(1) | ⓮ | Charge Enable |
❻ | Mounting hole*4 | ⓯ | Dry contact port (Oil generator/Utility) |
❼ | Grounding terminal | ⓰ | Cooling fan |
❽ | PV1 terminals(1) | ⓱ | White Terminal Cover (Optional) |
❾ | Battery terminals(1) |
IT-NC G3 solar charge controller interface
❶ | Indicator | ❿ | Load terminals |
❷ | LCD | ⓫ | COM: RS485 COM port (RJ45, with isolation design, 5VDC/200mA) |
❸ | Buttons | ⓬ | RTS/BMS COM interface |
❹ | Protective cover hole (M4) | ⓭ | CAN-PARA In: Parallel COM input port for multiple controllers (RJ45, with isolation design) |
❺ | PV2 terminals | ⓮ | CAN-PARA Out: Parallel COM output port for multiple controller (RJ45, with isolation design) |
❻ | Mounting hole*4 | ⓯ | Charge Enable |
❼ | Grounding terminal | ⓰ | Dry contact port (Oil generator/Utility) |
❽ | PV1 terminals | ⓱ | Cooling fan |
❾ | Battery terminals | ⓲ | White Terminal Cover (Optional) |
Naming rules
The naming convention for the ET/IT-NC Series provides clear insights into their configuration and technical specifications. Each part of the model name provides key details.
Below is a clear breakdown of the naming structure:
Naming rule for series ET-NC G3
- G3: Indicates the 3rd generation, featuring enhanced technology and improved performance for modern energy systems
- C/E: Denotes the display type. C specifies an LCD screen, while E refers to an LED indicator, providing flexible monitoring options
- N/P/X: Refers to the system type
N: Common negative system
P: Common positive system
X: Neither common positive nor common negative, offering a unique configuration.
- PV Maximum Open-Circuit Voltage: Represents the maximum allowable voltage of the PV input.
20: 200V
15: 150V
- Battery Rated Voltage: Highlights the supported battery voltage levels.
2: Compatible with 12/24V DC systems
4: Compatible with 12/24/36/48V DC systems
- Rated Charging/Discharging Current: Specifies the maximum charge/discharge current.
10: 100A
8: 80A
7: 75A
6: 60A
5: 50A
- Product Series: Identifies the product series.
- ET Series: Designed for energy storage applications without load output, ensuring efficient energy management.
Naming rule for series IT-NC G3/IT-NC G3 BLE
- BLE: Indicates a built-in Bluetooth module, enabling wireless connectivity for easy monitoring and control.
- G3: Indicates the 3rd generation, featuring advanced technology and improved performance.
- C/E: Refers to the display type. C specifies an LCD screen, while E refers to an LED indicator, offering convenient monitoring options.
- N/P/X: Defines the system type:
N: Common negative system
P: Common positive system
X: Neither common positive nor common negative, allowing for unique configurations.
- PV Maximum Open-Circuit Voltage: Highlights the maximum allowable voltage of the PV input.
20: 200V
15: 150V
- Battery Rated Voltage: Specifies supported battery voltage levels.
2: Supports 12/24V DC systems
4: Supports 12/24/36/48V DC systems
- Rated Charging/Discharging Current: Indicates the maximum current capacity.
10: 100A
8: 80A
7: 75A
6: 60A
5: 50A
- Product Series: Identifies the product type.
- IT Series: Designed with load output, suitable for applications requiring both charging and discharging capabilities.
ET/IT-NC G3 System connection diagram
The ET/IT-NC G3 series charge controllers are built for flexibility. They work in both no-battery and battery-connected modes. With dual PV inputs, they can capture energy from two solar arrays, making them highly efficient.
In no-battery mode, solar energy is sent straight to the inverter. It powers your devices directly without needing a battery. This is great for simple setups.
In battery-connected mode, the controllers manage charging to keep the battery safe. The IT-NC series goes further. It powers connected loads directly, even while charging the battery.
This design makes the ET/IT-NC G3 series perfect for off-grid and hybrid systems. They are reliable, efficient, and ready to meet different energy needs.
ET/IT-NC G3 Parallel Connection
The ET/IT-NC G3 series controllers support parallel operation for up to 6 units. This means you can connect multiple controllers to work together, increasing the system’s capacity. Each controller handles its own solar input and battery connection, but they work as a team. The IT-NC takes it further by supplying power directly to loads without the need for a battery, as long as sufficient PV energy is available.
This setup works great for larger solar systems and is highly flexible. Even in no-battery mode, these controllers can be connected in parallel, allowing you to expand your system as needed. To ensure smooth communication between the devices, parallel communication cables must be connected.
The first and last controllers in the chain need CAN communication terminal resistors for proper operation. Both the communication cables (CC RJ45-RJ45-120) and terminal resistors (RJ45-CAN-R120) are optional accessories.
With this parallel setup, you can easily scale your solar system to handle more power, whether you’re using batteries or running without them. It’s reliable, adaptable, and designed to meet growing energy demands.
BMS-link Connection
The BMS-Link module ensures smooth communication between the controller and lithium batteries with BMS. By connecting the module to the battery through port ⓬, it converts different BMS protocols from various manufacturers into a standard protocol compatible with the controller. With compatibility for 32 lithium battery protocols, it works seamlessly with EPEVER batteries or select Pylontech batteries for direct communication. For other brands, the BMS-Link module enables easy integration.
Parameters uploaded from the BMS are used for display and charge/discharge management, ensuring faster and more accurate protection for your lithium batteries. This setup guarantees seamless integration and reliable operation, no matter the brand of your BMS-equipped lithium battery.
Supported battery brands（Partial content only; For more details, please refer to the manual)
Manufacturer | Protocol Name | Protocol Type |
Narada | SHINWA BMS ModbusV1.3 181127EN | Modbus |
Narada | Narada lithium battery BMS communication protocol V1.8 | Encrypted Modbus |
LinkData | PACE BMS Modbus Protocol for RS485 V1.3(2017-06-27) | Modbus |
LinkData | Updated _BMS protocol V2 6 (compatible with | Telecom |
Sacredsun | BMS009 cutomized)(20190925) | Telecom |
Ritar | Topband RS485 RS232 BMS protocol V1.4 | Telecom |
Sacredsun | RS485 RS232 BMS Communication Protocol RITAR(1) | Modbus |
Ritar | 485 Modbus Protocol V1.3 | Modbus |
Sunnew | Modbus-BMS-protocol V1.6 | Modbus |
EPEVER | Sunnew xxSxP ESS Prtocol V1.0 | Modbus |
PYLONTECH | EPEVER BMS RS485 Modbus Protocol V1.6 | Telecom |
MERITSUN | RS485-protocolpylonlowvoltage-V3.3-20180821 | Telecom |
ET/IT-NC G3 Application
The ET/IT-NC G3 series controllers are designed to meet the energy needs of various solar applications. Their versatility and advanced features make them ideal for the following scenarios:
- Solar RVs
Perfect for recreational vehicles, these controllers ensure a reliable and efficient energy supply, enabling uninterrupted off-grid adventures.
- Solar Home Power Supply
Ideal for homes, the controllers provide stable energy management, helping homeowners make the most of their solar power.
- Solar Camping
Designed for remote locations, the controllers support reliable energy storage and usage, making them perfect for off-grid setups.
- Solar Yacht
These controllers ensure consistent energy supply for boats, providing reliable power for marine operations.
- Solar Power Station
Suitable for portable energy solutions, the controllers offer flexibility and reliability for solar-powered charging stations.
With their robust design and adaptability, the ET/IT-NC G3 series controllers are the perfect choice for diverse solar energy systems.
ET/IT-NC G3 Working modes
The ET/IT-NC G3 series controllers provide 6 load control modes, offering versatile options for various applications:
- Manual Mode: Users can manually control the load as needed.
- Light Control Mode 1 (Night ON, Day OFF): The load automatically operates at night and turns off during the day.
- Light Control Mode 2 (Day ON, Night OFF): The load operates during the day and shuts off at night.
- Light Control + Timer Mode
Period 1: The load turns on after sunset and operates for x hours, then switches off.
Period 2: Before sunrise, the load turns on again for y hours and switches off at dawn.
- Timer Mode: The load follows preset time periods, independent of light conditions.
- Always ON Mode: The load operates continuously until the battery triggers over-discharge protection.
These modes provide flexible and reliable load control, making the controllers suitable for various scenarios like lighting, industrial systems, and off-grid applications.
Conclusion
The ET/IT-NC G3 series controllers are built for flexibility, efficiency, and reliability. Whether you need a simple battery-free setup or a system with energy storage, these controllers adapt to your needs. With dual PV inputs and support for up to six units in parallel, they are perfect for expanding solar systems as your energy demands grow.
The IT-NC series goes further by powering loads directly while ensuring battery safety and compatibility through the BMS-Link module. With a durable design and advanced monitoring, the ET/IT-NC G3 series makes solar energy management simple and reliable.
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