Important Safety Instructions Please keep this manual for future reference. This manual contains safety, installation and operation instructions for the ET-NC G3 series solar charge controller (hereinafter referred to as "controller" in this manual). Read all the instructions and warnings carefully in the manual before installation. ...
Page 5
WARNING HOT SURFACE: Indicate a danger caused by high temperature, if not avoided, may cause burns to personnel. Read the user manual carefully before any operation.
Disclaimers The warranty does not apply to the following conditions: Damage caused by improper use or inappropriate environments (It is strictly forbidden to install the controller in the humid, salt spray, corrosive, greasy, flammable, explosive, dust accumulative or other harsh environments).
1 General Information 1.1 Overview ET-NC G3 series incorporates a new design concept, with solar charge controller as the main body. With a brand new generation of MPPT control algorithm, it significantly improves the tracking and response speed of maximum power point. Minimizing the loss rate and time of the maximum power point guarantees the maximum power point tracking efficiency, response speed and DC/DC conversion efficiency in high and low power bands.
Page 8
Features Low power consumption with static loss less than 50mA Independent voltage stabilization Advanced MPPT technology, with maximum tracking efficiency not less than 99.5% Supporting two PV inputs to improve PV utilization ① Conversion efficiency up to 98.5% ...
Page 10
BMS protocol number of 10, 27 or 34, you can connect the batteries directly to port ⓬ manufacturers. When using the Pylon batteries with BMS protocol number of 21, and the Epever by removing the BMS-Link module, and set the BMS protocol number accordingly for BMS communication.
Page 11
For currently supported BMS manufacturers and corresponding protocols, please go Tip: to the EPEVER website to view or download. If the remote temperature sensor is not connected to the controller, the default temperature for battery charging is 25°C without temperature compensation.
Page 12
open contact. Note: To use only“NO”, or both“NC” and “NO” is subject to the actual control demand of the oil generator when adding the oil generator or there is utility charging in the system. Power supply parameters applicable to the dry contact port (Oil generator/Utility) ...
Page 13
Note: It is not mandatory to connect the oil generator or utility, you can connect them according to your actual needs. (7) Not all the models are equipped with fans, please refer to the actual product. Only ET10420NC G3 is equipped with fans.
1.3 Naming rules Naming rule for series IT-NC G3 1.4 System wiring diagram No battery mode When there is no battery, ET-NC G3 series controller can be connected to the inverter directly. The inverter must be connected to the battery terminals of the controller and meet the following conditions at the same time.
Battery mode In a system with battery connected, if you need to connect an inverter, please connect the inverter directly to the battery pack. WARNING Ensure that the length of battery connection cable is less than 3 meters. Ensure that the length of communication cable is less than 3 meters.
2 Installation 2.1 Attention Be careful when installing the batteries. Wear protective goggles when installing flooded lead-acid batteries, and rinse with clean water in time once in contact with battery acid. The battery and PV connections must be guarded against with inadvertent contact. Install the solar ...
PV input current. For controller’s maximum PV input current and maximum PV cable specifications, please refer to the table below. Maximum PV Input Maximum PV Cable Model Current Specifications ET5420NC G3 16mm /6AWG ET7420NC G3 25mm /4AWG ET10420NC G3...
Battery cable specifications Battery cable specifications should be selected according rated current, please refer to the table below for wiring specifications. Model Rated Charging Current Battery Cable Specifications ET5420NC G3 16mm /6AWG ET7420NC G3 25mm /4AWG ET10420NC G3 100A...
Page 19
diagram (IP32)”. If the controller is mounted in a closed cabinet, ensure that heat can be dissipated through the cabinet. CAUTION Figure 2-1: Installation diagram (IP43) Figure 2-2: Installation diagram (IP32)
Step 2: Remove the terminal cover Figure 2-3: Remove the terminal cover (IP43) 2.5 Controller connection Connect the controller in the sequence of “❶Ground > ❷Battery > ❸Load > ❹ PV array > ❺ Communication modules”, and disconnect the controller wiring in the reverse order of Figure 2-4. The following wiring diagram is illustrated with the appearance of "ET10420NC G3”.
Page 21
Figure 2-5: Parallel wiring diagram of multiple controllers (1) Grounding ET-NC G3 series is common negative controller. Negative terminals of the PV array and battery can be grounded simultaneously, or any negative terminal is grounded. However, according to the actual application, the negative terminals of the PV ...
Page 22
Do not connect the circuit breaker or fast-acting fuse when wiring and ensure that the leads of "+" and "-" poles are connected correctly. A fast-acting fuse whose current is 1.25 to 2 times the controller’s rated current must be installed on the battery side with a distance from the battery no longer CAUTION than 150 mm.
Page 23
(4) Connect optional accessories Connect the BMS-Link module When the system uses lithium batteries with BMS function, connect the BMS-Link module and lithium batteries through the port ⓬; with the setting of the BMS protocol number, the BMS-Link module can convert the BMS protocols of different lithium battery manufacturers into our standard protocols to realize the communication between the controller and lithium batteries BMS of different manufacturers.
Page 24
If the remote temperature sensor is not connected to the controller, the default temperature for battery charging is 25°C without temperature compensation. CAUTION Connect the communication module Connect the communication modules such as WiFi, Bluetooth, TCP or 4G modules to the RS485 COM port.
2.6 Power on the controller Connect the battery’s fast-acting fuse to power on the controller. After the LCD normally displays and ensure the charge enable terminals are connected to the controller, connect the PV array’s circuit breaker. The charging indicator is flashing slowly during PV charging. If the controller does not work properly or the fault indicator indicates after the controller is powered on, refer to Chapter 4.2 Troubleshooting.
3 Interface Note: The LCD can be viewed clearly when the angle between the end-user's horizontal sight and the LCD is within 90°. If the angle exceeds 90°, the information on the LCD cannot be viewed clearly. 3.1 Indicator Indicator Color Status Description...
Indicator Color Status Description Battery under voltage (including battery pack Orange Solid ON under voltage), cell under voltage Solid ON Battery over discharging BATT Battery over temperature, battery low Slowly temperature, cell over temperature, cell low flashing (1Hz) temperature, BMS charging protection, BMS discharging protection Fast Flashing BMS other faults, BMS sensor fault, lithium...
3.3 LCD 1) Icons Status Name Icon Night Not charging PV array Charging Note: “B, E, F” refer to boost charging, equalization charging and float charging respectively. Displays the input voltage, input current, input PV1/PV2 power and input energy of PV1 and PV2, see Chapter 3.4.1 PV real-time data.
3.4.2 Battery Click on the real-time data interface of "PV2 input energy" to display the following battery real-time data interfaces in sequence, you can view the battery voltage, battery charging current, battery charging power, battery SOC, and battery temperature.
3.5 Parameters setting Operation steps: ① In PV/battery real-time data browsing interface, press and hold the button to enter the parameter setting interface. Press the button to select the parameter to be set. Press and hold the button to enter the setting interface of the parameter (the parameter value is blinking). ...
3.5.1 Parameters The default values and setting range of the controller parameters on the LCD are shown in the following table, except for some read-only parameters, other parameters can be directly modified by the LCD: Parameters Default User define 48V system: AGM, GEL, FLD, LFP15S, LFP16S, LNCM13S, LNCM14S, USER 24V system: AGM, GEL, FLD, LFP8S, LNCM6S, (Battery Type)
Page 32
Parameters Default User define User define: 9.0–15.5V, small step size: 0.1V, 15.0V large step size: 1V. (12V system) 30.0V User define: 18.0–31.0V, small step size: 0.1V, (Charging large step size: 1V. Voltage Limit (24V system) Voltage) 60.0V User define: 36.0–62.0V, small step size: 0.1V, large step size: 1V.
Page 33
Parameters Default User define 13.2V User define: 9.0–15.5V, small step size: 0.1V, (12V system) large step size: 1V. 26.4V User define: 18.0–31.0V, small step size: 0.1V, (Bulk Voltage large step size: 1V. Recovery (24V system) Voltage) 52.8V User define: 36.0–62.0V, small step size: 0.1V, large step size: 1V.
Page 34
Parameters Default User define 10.6V User define: 9.0–15.5V, small step size: 0.1V, large (12V system) step size: 1V. 21.2V (Discharging User define: 18.0–31.0V, small step size: 0.1V, large Voltage Limit step size: 1V. (24V system) Voltage) 42.4V User define: 36.0–62.0V, small step size: 0.1V, large step size: 1V.
Page 35
Parameters Default User define User define: OFF, ON (Manual Equalize Set to "ON" to enable the controller and start Charging) equalization charging. IT5420NC G3: User define: 1–50A, small step size: 1A, large step size: 10A. IT6415NC G3 / IT6420NC G3 / IT6415NC G3 BLE: User define: 1–60A, small step size: 1A, large step (Battery Max Charging size: 10A.
Page 36
Parameters Default User define User define: INDE (independent), CEN (Centralize) When two PV arrays are independently input, the value shall be set to "INDE”. When two PV arrays are connected in parallel as a single input to the controller (the PV terminals need to be paralleled externally), the value shall be set to "CEN”.
Page 37
Parameters Default User define Set the time interval of the historical data (only refers to the voltage, current and other data stored regularly, excluding the historical faults. These historical data (Data Record can be exported by the Solar Guardian PC software Period) or Website.) User define: 10–120 minutes, small step size: 1...
Page 38
Parameters Default User define Limit the total current for parallel charging. If the setting value of this parameter exceeds the maximum PMCC charging current of an individual controller times the (Parallel Battery quantity of parallel controllers, the parameter is invalid 1,200A Max Charging and the system will limit the charging according to the...
3.5.2 Battery voltage control parameters Lead-acid battery parameters The following table shows the voltage control parameters of 12V system (12V battery), voltage control parameters and user-define range of 24V system (24V battery) and 48V system (48V battery) are equal to the parameter values of 12V system times 2 and 4 respectively.
Page 40
C. Low Voltage Recovery Voltage > Low Voltage Disconnect Voltage ≥ Discharging Voltage Limit Voltage, D. Undervoltage Alarm Recovery Voltage > Undervoltage Alarm Voltage ≥ Discharging Voltage Limit Voltage, E. Bulk Voltage Recovery Voltage > Low Voltage Recovery Voltage. Lithium battery parameters ...
Page 41
Battery Type LFP15S LFP16S USER Range Voltage Control Parameters UVA (Undervoltage Alarm Voltage) 45.0V 49.6V 36–62V LVD (Low Voltage Disconnect Voltage) 42.5V 46.4V 36–62V DLV (Discharging Voltage Limit Voltage) 41.5V 44.0V 36–62V Note:The voltage of LFP15S and LFP16S is 48V. LNCM Battery Type USER...
Page 42
LNCM Battery Type USER LNCM13S LNCM14S Voltage Control Parameters Range OVD (Overvoltage Disconnect Voltage) 55.4V 59.7V 36–68V CVL (Charging Voltage Limit Voltage) 54.6V 58.8V 36–62V OVR (Overvoltage Recovery Voltage) 54.1V 58.3V 36–62V ECV (Equalize Charging Voltage) 54.1V 58.3V 36–62V BCV (Bulk Charging Voltage) 54.1V 58.3V 36–62V...
3.5.3 Control strategy under lithium battery protocol When the BMS is connected correctly, the BPRO (BMS protocol) is set correctly, and "UBS (Use BMS Settings)" is set to "ON", the system follows the following control strategies: Status/Condition Control strategy Battery forced charge Forced charge the battery with the charging current value request appears.
Control Voltage Converted Voltage Float Charging Voltage Charging limit voltage - 0.1 × Level Boost Voltage Charging Voltage Upper Limit - 0.8 × Level Reconnect Voltage Low Voltage Reconnect Discharging Voltage Lower Limit + 0.7 × Level Voltage Under Voltage Alarm Discharging Voltage Lower Limit + 0.7 ×...
Page 45
Connecting the external Bluetooth module Connect the Bluetooth module to the COM port of the controller, set the “USER” voltage parameters on the APP through the Bluetooth signal. For specific setting methods, please refer to the cloud APP manual.
4 Others 4.1 Protections IT-NC G3 / IT-NC G3 BLE series controllers have no battery reverse protection. Do not reverse the battery connection cables when wiring. Otherwise, the controller may WARNING be damaged. Description Protections When the actual charging current/power of the PV array exceeds its current/power-limiting rated current/power, it will charge the battery as per the rated protection...
Page 47
Description Protections When the battery polarity is reversed alone, or the PV and battery are reversed at the same time, or the battery is reversed first and the PV is connected correctly later, the controller will not be damaged and will Battery reverse polarity continue to work after the wiring error is corrected.
For example, ET10420NC G3 48V system: 4.2 Troubleshooting Error Possible Status Troubleshooting Code Reasons Check whether the connected PV open circuit voltage is higher than the PV maximum open PV Overvoltage circuit voltage, and the alarm is cleared when the PV open circuit voltage is lower than the PV maximum open circuit voltage minus 5V.
Page 49
Error Status Possible Reasons Troubleshooting Code Disconnect the loads connection, and Battery Under check whether the battery voltage is too Voltage Alarm low. After the battery is charged and its BATT (including battery voltage is restored above “UVAR (Under indicator pack under voltage Voltage Alarm Recovery Voltage)”, it will is solid...
Page 50
Error Status Possible Reasons Troubleshooting Code Ensure the battery is installed in a cool and well-ventilated place, check that the battery actual charging and discharging current does not exceed the set values of "Battery Charging Current". Battery Over connected, “MCC” is the read value from Temperature the BMS, which cannot be set.
Page 51
Error Status Possible Reasons Troubleshooting Code BMS Over Current BOCD Discharging Alarm Check the BMS communication status or BMS Over Current BMS parameters settings. BOCC Charging Alarm BMS voltage and current limiting BMS is normal and no troubleshooting is parameters are required.
4.3 Maintenance To maintain long-term working performance, it is recommended to have the following items inspected twice a year. Ensure the airflow around the inverter is not blocked, and remove dirt or debris from the heat sink. Check whether the insulation of exposed cables have been damaged by sunlight, friction with other surrounding objects, dryness, insects or rodents, etc.
5 Specifications Model ET5420NC G3 Electrical Parameters Battery Rated Voltage 12/24/48VDC or Auto Controller Operating Voltage Range 8–62V Battery Type AGM (Default) / Gel / Flooded / User Lithium Battery Type LiFePO4 / Li (NiCoMn)O2 / User Rated Charging/Discharging Current Rated Charging Power 650W/12V;...
Page 54
Model ET7420NC G3 Electrical Parameters Battery Rated Voltage 12/24/48VDC or Auto Controller Operating Voltage Range 8–62V Battery Type AGM (Default) / Gel / Flooded / User Lithium Battery Type LiFePO4 / Li (NiCoMn)O2 / User Rated Charging/Discharging Current Rated Charging Power 975W/12V;...
Page 55
Model ET10420NC G3 Electrical Parameters Battery Rated Voltage 12/24/48VDC or Auto Controller Operating Voltage Range 8–62V Battery Type AGM (Default) / Gel / Flooded / User Lithium Battery Type LiFePO4 / Li (NiCoMn)O2 / User Rated Charging/Discharging Current 100A Rated Charging Power 1,300W/12V;...
Page 56
Environmental Parameters Operating Temperature Range -25℃ to +60℃ (Derating when temperature is higher than 40℃) LCD temperature range -20℃ to +70℃ Storage Temperature Range -30℃ to +70℃ Relative Humidity 5%–95% (N.C) Altitude < 5,000M (Derating when altitude is higher than 2,000m) Enclosure IP43 (Controller &...
6.2 Appendix 2 Index of Abbreviations LCD Parameter Setting Abbreviations Abbreviations Full Name Battery Type DSP Firmware Version ARM Firmware Version PMCC Parallel Maximum Charging Current Clear Accumulated Energy Com Port Enable PRCP PV Restart Charging Period Data Record Period Screen Cycle Time Screen Backlight Time Temperature Unit...
Page 61
Abbreviations Full Name Boost Charging Time Equalize Charging Time Discharging Voltage Limit Voltage Low Voltage Disconnect Voltage Under Voltage Alarm Voltage UVAR Under Voltage Alarm Recovery Voltage Low Voltage Reconnect Voltage Boost Voltage Reconnect Voltage Float Charging Voltage Boost Charging Voltage Equalize Charging Voltage Over Voltage Reconnect Voltage Charging Limit Voltage...
Page 62
Error Codes Abbreviations Abbreviations Full Name PV Overvoltage PV Work Mode Error PV Reverse Polarity Protection PV Relay Error PV Power Low Battery Under Voltage Alarm (including battery pack under voltage alarm) Battery Over Voltage Protection Battery Over Discharging Protection Battery Over Temperature Battery Low Temperature Cell Over Voltage Protection...
Need help?
Do you have a question about the ET5420NC G3 and is the answer not in the manual?
Questions and answers