POWERTECH MP3741 (01) PDF MANUAL


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PDF Content Summary: MP3741 MPPT Solar Charge Controller User Manual Page 1

Important Safety Instructions Please keep this manual for future reference. This manual contains all instructions of safety, installation and operation for MP3741 Maximum Power Point Tracking (MPPT) controller (referred in this manual as "the controller"). General Safety Information: • Carefully read all the instructions and warnings in the manual before installation. • No user serviceable component inside controller. DO NOT disassemble or attempt to repair the controller. • The controller must be mounted indoors, or outdoors in a waterproof enclosure. Prevent exposure to the elements and do not allow water to enter the controller. • Install the controller in a well-ventilated place; the controller’s heat sink may become very hot during operation. • Always Install appropriate external fuses/breakers. • Ensure all connections to Solar panels and batteries are disconnected or otherwise disabled before making or altering bare-wire connections to controller. • Take particular care that all power connections are tight and likely to remain so to avoid excessive heating from a loose connection. Page 2 Contents 1 General Information............................................................................... 4 1.1 Overview........................................................................................ 4 1.2 General Appearance and Connections............................................ 5 1.3 Available Accessories..................................................................... 6 1.4 Maximum Power Point Tracking Technology Details ........................ 6 1.5 Battery Charging Stage .................................................................. 8 2 Installation Instructions……………………………………………………...…10 2.1 General Installation Notes…………………………………………...……10 2.2 Solar Array Requirements………………………..……………………….11 2.3 Wire Size ..................................................................................... ..11 2.4 Mounting…………………………………………………………..………..12 3 Operation ............................................................................................. ..13 3.1 Button Function............................................................................ ..14 3.2 LCD Display................................................................................. ..14 3.3 Parameters setting ....................................................................... ..16 3.4 Battery type.................................................................................. ..19 4 Protection systems, Troubleshooting and Maintenance..................... ..20 4.1 Protection .................................................................................... ..20 4.2 Troubleshooting ........................................................................... ..22 4.3 Maintenance ................................................................................ ..23 5 Technical Specifications...................................................................... ..24 Appendix 1 Conversion Efficiency Curves.................................................. ..25 Appendix 2 Dimensions............................................................................. ..26 Appendix 3. How to set battery parameters via WiFi APP........................... ..27 Appendix 4. Solar Control Monitor for MP3741 (RS-485/USB) using USB cable adaptor.................................................... ..39 Page 3 1. General Information 1.1 Overview With the MPPT control algorithm, the MP3741 can quickly and accurately calculate the best maximum power point (MPP) of solar arrays, in order to extract the maximum amount of charge current from the solar energy available. This gives a considerable improvement over simpler PWM types, plus the solar voltage can be much higher than the battery voltage. There is a dual display function: The inbuilt LCD panel and remote meter (not included). With Modbus communication protocol interface, users can control the MP3741 via the Internet from any location with online access. Features: • Automatic current limit function of Solar input power, preventing overload. • Wide MPPT operating voltage range. • 12/24VDC automatic battery voltage detection. • LCD panel display dynamically displays operating data and working conditions. • Multiple load control modes: Manual mode, Light ON/OFF, Light by Timer and test mode. • 3 preprogramed Lead-Acid battery options: Sealed, Gel, Flooded. Others can be installed via external software (interface hardware required). • Battery temperature compensation function (requires Remote Temperature Sensor, not included). • Real-time energy statistics function. • RS-485 communication bus interface and Modbus communication protocol, allow it to meet various remote communication requirements. • Supports software upgrades. Page 4 1.2 General Appearance and Connections Figure 1-1 MP3741 Connections Item Name Item Name ① Mounting hole (5mm) ⑥ Load Terminals ② Select Button ⑦ RS-485 Port** Remote Temperature

③ Sensor Socket * ⑧ Enter Button

④ PV (Solar) Power Input Terminals ⑨ LCD Display ⑤ Battery Terminals Explanations: * Connection for an RTS (Remote Temperature Sensor) to remotely detect battery temperature. (RTS not supplied but can be ordered). ** Monitor controller by PC, remote meter MT50 or APP and update controller software via RS485 (RJ45 interface, extra hardware is required). Page 5 1.3 Available Accessories Note: Parts marked ** may or may not be stocked at any given time. Check with nearest store for more details. 1. S-485 to WiFi converter (MP3746, sold separately) Allows wireless programming and monitoring via WiFi from any location with Internet access. See: “Appendix 1 & 2 Setting parameters using external controllers.” 2. ** Remote Temperature Sensor (Model: RTS300R47K3.81A) Monitors battery temperature for undertaking temperature compensation of control parameters. The standard length of the cable is 3m (length can be customized). The RTS300R47K3.81A connects to the port (3) on the controller. NOTE: If not fitted, the temperature of battery will be assumed to be 25ºC. 3. Remote Meter (MP3748, sold separately) The digital remote meter displays system operating information, error indications, parameters setting and self-diagnostics. 4. ** Super Parameter Programmer (Model: SPP-02) The SPP-02 allows one-button setting operation which is useful for bulk parameter setting for special projects. 5. USB to RS-485 converter (MP3747, sold separately) USB to RS-485 converter is used to monitor each controller on the network using Solar Station PC software. The length of cable is 1.5m. Connects to the RS-485 Port on the controller. (See: “Appendix 3 & 4 Setting parameters using external controllers.” 1.4 Maximum Power Point Tracking Technology Due to the nonlinear characteristics of solar arrays, they have an optimum voltage/current energy delivery point (Max Power Point). Selection of the best MPP parameter gives the most efficient use of the available solar energy. Cheaper controllers, with either simple switch disconnection when full, or PWM charging technology, cannot charge the battery at the maximum power point, so can’t extract the maximum energy available from the solar array. Solar charge controllers with Maximum Power Point Tracking (MPPT) Technology can continuously lock on the optimum point to harvest the maximum available energy and deliver it to the battery. The tracking process is fully automatic and does not need user adjustment. Page 6 Figure 1-2 shows the MPPT curve; the shaded area is the charging range of a traditional solar charge controller (PWM Charging Mode), which illustrates how the MPPT mode can improve the usage of the solar energy available. According to our tests, the MPPT controller can improve efficiency by about 20%-30% compared to the PWM controller. (Actual result may vary due to the influence of cloud, temperature and other ambient circumstances.) Figure 1-2 Maximum Power Point Curve In real-world applications, such as shading from clouds, trees or snow, the panel may appear Multi-MPP, but in actually there is only one real Maximum Power Point. As the below Figure 1-3 shows: Figure 1-3 Mutil-MPP Curve Page 7 Our MPPT algorithm, custom-designed by our company, can track the real MPP quickly and accurately, improve the utilization rate of the solar array and avoid the waste of resources. 1.5 Battery Charging Stage The controller has a 3 stages battery charging algorithm (Bulk Charging, Constant Charging and Float Charging) for rapid, efficient, and safe battery charging. Figure 1-4 Battery changing stage Curve A) Bulk Charging: In this stage, the battery voltage has not yet reached constant voltage (Equalize or Boost Voltage), the controller operates in constant current mode, delivering its maximum current to the batteries (MPPT Charging). B) Constant Charging: When the battery voltage reaches the constant voltage setpoint, the controller will start to operate in constant charging mode, no longer using the full MPPT output. The Constant Charging mode has 2 stages, equalize and boost. These two stages are not carried out constantly in the full charge process to avoid excessive gas production or overheating of battery. Page 8 • Boost Charging The Boost stage default time is 2 hours, user can adjust the time and value of boost voltage according to requirements. The stage is used to prevent heating and excessive battery gassing. • Equalize Charging WARNING: Explosive Risk! Equalizing flooded cell battery can produce explosive gases, so a well-ventilated battery box is recommended. CAUTION: Equipment Damage! Equalization may increase battery voltage to a level that damages connected equipment. Verify that all connected equipment can tolerate a DC input voltage at least 11% greater than the equalizing charging voltage. CAUTION: Equipment Damage! Too high an equalizing charge or for too long may cause damage. Over-charging and excessive gas production may damage the battery plates and cause them to shed material. Please carefully review the specific requirements of the battery used in the system. Some types of batteries benefit from equalizing charge on a regular basis, which is able to re-mix the electrolyte and balance the battery voltage. Equalizing is done by increasing the battery voltage higher than the standard float voltage, which produces gas bubbles from the battery electrolyte, causing the liquid to re-circulate. The controller will equalize the battery on 28th of each month. The standard equalization period is 0~180 minutes. If the equalization isn’t accomplished the first time, the equalization recharge time will be accumulated until the set time is finished. NOTE: 1. If, due to the influence of ambient conditions or variations in load, the battery voltage can’t remain at the equalize voltage at the programmed time, controller will accumulate and calculate the time of constant voltage working. When the accumulated time reaches 3 hours, the charging mode will turn to Float Charging. 2. If the controller time is not altered, the controller will equalize charge battery once every month following its on-board clock time. Page 9 C) Float Charging After the Constant voltage stage, the controller will reduce charging to Float Voltage setting, delivering a much smaller voltage and current. The main purpose of the Float stage is to compensate for the power consumption caused by self-discharge of the battery and any small (standby) loads in the power system, while maintaining full battery storage capacity. In Float charging stage, loads are able to obtain almost all power from solar panel. If the load exceeds the solar power available, the controller will no longer be able to maintain the battery at “Float” voltage, and some of the power will be drawn from the battery. If the battery voltage drops below Recharge Voltage, the system will leave Float charging stage and return to Bulk charging stage using whatever solar power is available. 2. Installation Instructions 2.1 General Installation Notes Before installation, please read through the entire installation instructions and familiarize yourself with the installation steps. • Take care when installing the batteries, especially flooded lead-acid batteries. Wear eye protection, and have fresh water available in case of battery acid leakage or spillage • The controller comes pre-set for Gel, Sealed or Flooded batteries; other kinds please refer to the battery manufacturer. • Keep metal objects away from the battery terminals, which may cause short circuit of the battery. • The battery may emit explosive gases during charging, ensure sure ventilation is adequate. • Never install the controller in a fully sealed enclosure, in particular with flooded cell batteries with removable filler caps! Battery fumes from vented batteries will corrode and quickly destroy the controller circuits. • Loose power connections and corroded wires may result in high temperatures that can melt wire insulation, burn surrounding materials, or even cause fire. Ensure all connections are tight and use cable clamps to secure cables and prevent them from swaying in mobile applications. • Battery connection may be wired to one battery or a bank of batteries. (The following instructions refer to a single battery, but it is implied that the battery connection can be made to either one battery or a group of batteries wired up as a battery bank). • Multiple MP3741 controllers can be installed in parallel on the same battery bank to achieve higher charging current. However, each controller must have its own separate solar module(s). You cannot run more than one MP3741 from the same solar array. Page 10 2.2 Solar Array Requirements Serial connection (string) of Solar Panels If you want to use more than one 12 Volt solar panel, it will be more efficient to run them in series to produce a higher voltage. Note maximum ratings below. If the Solar array’s power rating higher than the MP3741’s rated power, the charging rate will be at the maximum a single MP3741can deliver. You cannot add more MP3741s to utilize the extra available power from the solar panels. You can, however, use extra MP3741’s with the same battery(s) as long as they are fed by separate Solar Panels. WARNING: Controller will be damaged if the Solar array maximum open circuit voltages are exceeded. You should always measure the open-circuit Panel voltage in bright sun before connecting anything. 2.3 Wire Size Model MP3741 Rated Charge Current 20A Rated Charge Power 12V: 260W 24V: 520W Max. Solar Array Power 12V: 780W 24V: 1560W Max. Solar open circuit voltage 92V (At 25°C) 100V (At -25°C) Recommended minimum wire size Solar to Controller: 6mm2 10AWG Controller to Battery: 6mm2 10AWG Battery to Load: 6mm2 10AWG NOTE: The wire size is only for reference. If there is a long distance between the Solar array and the controller or between the controller and the battery, larger wires can be used to reduce the voltage drop and improve performance. The wire size quoted above will comfortably fit the screw terminals of the MP3741; thicker wires may require bootlace ferrules fitted. Generally, if space and budget permit, the thicker the wire, the better. Page 11 2.4 Mounting CAUTION: The controller requires at least 150mm of clearance above and below for proper air flow. Ventilation is strongly recommended if mounted in an enclosure. WARNING: Risk of explosion! Never install the controller in a sealed enclose with flooded batteries! Do not install in a confined area where battery gas can accumulate. WARNING: Risk of electric shock! Exercise caution when handling solar wiring. The solar array can produce open-circuit voltages in excess of 100V when in bright sunlight. With wet skin this can result in a severe shock. All fitting of Solar connectors should ideally be done either out of the sun, or with the solar panels covered by opaque material such as a blanket. Figure 2-1 Mounting Page 12 1) Connect components to the charge controller in the sequence as shown above and pay particular attention to the “+” and “-”. Don’t switch on the Solar panel breaker until the installation is complete. When disconnecting the system, the order must be reversed. 2) After installation, switch on the breaker and check that the LCD display comes on. If it’s not on, please refer to chapter 4. NB: Always make sure the battery is connected to the controller BEFORE Solar Power is applied, to allow the controller to recognize the system voltage. 3) The battery fuse should be installed as close to battery as possible. The suggested distance is within 150mm. 4) The MP3741 is a positive ground controller. Any positive connection of solar, load or battery can be earth grounded as required. CAUTION: If the Remote Temperature Sensor (RTS) is unplugged or not fitted, the temperature of battery is assumed to be 25 ºC. CAUTION: If you want to use an inverter, connect the inverter to the battery terminals rather than to the controller terminals. (It is always a good policy that anything you can power direct from 12 Volts, should be powered from 12 Volts, rather than using a 240V device through an inverter). 3 Operation 3.1 Button Functions Button Function SELECT button Browse interface Setting parameter Load ON/OFF ENTER button Clear error Enter into Set Mode Save data

3.2 LCD Display Page 13

Status Item Icon Status PV (Solar) array Day Night No charging Charging PV Voltage, Current, Power Battery Battery capacity, In Charging Battery Voltage, Current, Temperature Battery Type Load Load ON Load OFF Load Voltage, Current, Load mode Fault Indication Status Icon Description Battery over Battery level shows empty, battery frame discharged blink, fault icon blink Battery over Battery level shows full, battery frame blink, voltage fault icon blink Battery over Battery level shows current value, battery temperature frame blink, fault icon blink Load failure Load overload① ,Load short circuit ①When load current reaches1.02-1.05 times 1.05-1.25 times, 1.25-1.35 times and 1.35-1.5 times more than nominal value, controller will automatically turn off loads in 50s, 30s,10s and 2s respectively. Page 14 Browse interface NOTE: 1) When no operation, the interface will be automatic cycle, but the follow two interfaces not be displayed. 2) Accumulative power zero clearing: Under PV power interface, press ENTER button and hold for 5s until the value starts to flash, release, then briefly press ENTER button again to clear the value. 3) Setting temperature unit: Under battery temperature interface, press ENTER button and hold for 5s to switch. Page 15 3.3 Parameter setting Load mode setting (Load means switched power output terminals) Set Load modes as follows as below Operating Steps: Under load mode setting interface, press ENTER button and hold for 5 seconds till the number begin flashing, then press SELECT button to select the parameter, press ENTER button to confirm. Time 1 Time 2 Light ON/OFF Disabled Load will be on for 1 hour Load will be on for 1 hour since sunset before sunrise Load will be on for 2 hours Load will be on for 2 hours since sunset before sunrise ~ Load will be on for 3~13 hours ~ Load will be on for 3~13 since sunset hours before sunrise Load will be on for 14 hours Load will be on for 14 since sunset hours before sunrise Load will be on for 15 hours Load will be on for 15 since sunset hours before sunrise Test mode Disabled Manual mode(Default load Disabled ON) NOTE: Please set Light ON/OFF, Test mode and Manual mode via Timer 1. Timer 2 will be disabled and display " ". Page 16

Operational Parameter Setting: There are five ways of configuring the controller. Item 1 MP3746 is the only system available as a normal stock item. The others can be ordered: 1) RS-485 to WiFi converter (MP3746, sold separately) Allows wireless programming and monitoring via WiFi from any location with Internet access. See Appendix 1 & 2 Setting parameters using external controllers. 2) Remote meter, MT50 (Use standard twisted net cable, model: CC-RS485-RS485-200U-MT). 3) Super parameter programmer, SPP-02 (Use standard twisted net cable, model: CC-RS485-RS485-200U). One-button easily configure and apply to batch setting. 4) PC monitoring setting software “Solar Station Monitor” (Use USB to RS485 converter cable: CC-USB-RS485-150U).Page 17

WARNING: DO NOT attempt to communicate with the PC using the Ethernet cable, otherwise the components of controller will be damaged. The RJ45 interface pin define is shown below: Pins Define 1 Power supply output +5V 2 Power supply output +5V 3 RS-485-B 4 RS-485-B 5 RS-485-A 6 RS-485-A 7 Ground 8 Ground WARNING: The RJ45 interface is only allowed to connect with MP3746 or accessed by a qualified engineer. (The RJ45 interface Voltage is 5V and the current is 50mA) 5) Mobile APP (Use USB to RS485 converter cable: CC-USB-RS485-150U and OTG cable: OTG-12CM) Page 18 3.4 Battery Type Operating Steps: Under Battery Voltage interface, press and hold ENTER button until you see Battery type setting. After choosing the battery type using SELECT button, wait for 5 seconds or press ENTER button again to lock in the modification. Battery Type: ① Sealed Lead Acid (Default) ②Gel ③Flooded Lead Acid ④User(Apply to “MT50” and “PC software “Solar Station Monitor”) Battery Voltage Parameters (parameters is in 12V system at 25°C, please use double value in 24V.) Battery charging setting Sealed Gel Flooded User Over Voltage Disconnect 16.0V 16.0V 16.0V 9~17V Voltage Charging Limit Voltage 15.0V 15.0V 15.0V 9~17V Over Voltage Reconnect 15.0V 15.0V 15.0V 9~17V Voltage Equalize Charging 14.6V —— 14.8V 9~17V Voltage Boost Charging Voltage 14.4V 14.2V 14.6V 9~17V Float Charging Voltage 13.8V 13.8V 13.8V 9~17V Boost Reconnect 13.2V 13.2V 13.2V 9~17V Charging Voltage Low Voltage Reconnect 12.6V 12.6V 12.6V 9~17V Voltage Under Voltage Warning 12.2V 12.2V 12.2V 9~17V Reconnect Voltage Under Volt. Warning Volt. 12.0V 12.0V 12.0V 9~17V Low Volt. Disconnect Volt. 11.1V 11.1V 11.1V 9~17V Discharging Limit Voltage 10.6V 10.6V 10.6V 9~17V Equalize Duration (min.) 120 —— 120 0~180 Boost Duration (min.) 120 120 120 10~180 Page 19 NOTE: 1) When the battery type is sealed, gel, flooded, the adjusting range of equalize duration is 0 to180min and boost duration is 10 to180min. 2) The following rules must be observed when modifying the parameters value in user battery type (factory default value is the same as sealed type): a. Over Voltage Disconnect Voltage > Charging Limit Voltage ≥ Equalize Charging Voltage ≥ Boost Charging Voltage ≥ Float Charging Voltage > Boost Reconnect Charging Voltage. b. Over Voltage Disconnect Voltage > Over Voltage Reconnect Voltage c. Low Voltage Reconnect Voltage > Low Voltage Disconnect Voltage ≥ Discharging Limit Voltage. d. Under Voltage Warning Reconnect Voltage > Under Voltage Warning Voltage ≥ Discharging Limit Voltage. e. Boost Reconnect Charging voltage > Low Voltage Disconnect Voltage. 4 Protection, Troubleshooting and Maintenance 4.1 Protection Solar Array Over Current The controller will limit charge power to rated charge power. An over-sized PV array will not operate at maximum power point, unless more controllers are added. Solar Array Short Circuit When PV short circuit occurs, the controller will stop charging. Clear it to resume normal operation. Solar Array Reverse Polarity The controller is fully protected against reverse polarity, no damage to the controller will result. Correct the wiring to resume normal operation. WARNING: This only applies if the Panel voltage is within the acceptable open-circuit voltage range! Battery Reverse Polarity Fully protected against battery reverse polarity, no damage to the controller will result. Correct the wiring to resume normal operation. Battery Over voltage When battery voltage reaches the pre-set over voltage trip point voltage the controller will stop charging the battery to protect it Battery Over discharge When battery voltage drops below the pre-set low voltage trip point, the controller will disconnect the battery from the “Load” output to prevent over discharge. NOTE: This only protects the battery from over-discharge via the Load terminals. There is no protection from devices that connect direct to the battery. Battery Overheating (NOTE: Only applicable if Remote Temperature Sensor is fitted) The controller detects the battery temperature through the external temperature sensor. If the battery temperature exceeds 65ºC, the controller will automatically start the Page 20 overheating protection to suspend operations. Operation will restart when the temperature falls below 55 ºC. Load Overload If the load current exceeds the maximum load current rating, the controller will automatically disconnect the load. How fast this activates depends on the severity of the overload, meaning it will tolerate short-term overloads. Load Current Response time in seconds 21A 50 25A 30 27A 10 30A 2 >30 0 Controller Overheating If the temperature of the controller heat sinks exceeds 85℃, the controller will automatically shut down and restart when it drops below below 75℃. High Voltage Transients The controller’s Solar Inputs are protected against small high voltage surges such as static discharges. In lightning prone areas, additional external suppression is recommended. Page 21 4.2 Troubleshooting Faults Possible reasons Troubleshooting The LCD is off during daytime

when sunshine is falling on on Solar panels Wire connection is Solar array disconnection Confirm that Solar and battery wire connections are correct and tight Please check the voltage of

correct, LCD not battery. At least 9V voltage to Battery voltage is activate the controller display lower than 9V Battery voltage Check if the battery voltage is higher than over Interface too high, and disconnect the voltage disconnect blink solar module voltage(OVD) Load output is normal, Interface Battery under charging LED indicator will blink voltage return to green automatically when fully charged The controller will cut off the Interface Battery low voltage output automatically, LED disconnect indicator will return to green blink automatically when fully charged Remove or reduce the load Interface Over load or Short and press the button, the blink circuit controller will resume to work after 3 seconds Page 22 4.3 Maintenance The following inspections and maintenance tasks are recommended at least two times per year for best performance. Make sure controller firmly installed in a clean and dry position. Make sure there is no blockage of air-flow around the controller. Clear up any dirt and fragments on heatsink. Check all cables to ensure insulation is not damaged by insulation breakdown, frictional wear, dryness, insects or rats etc. Tighten all the terminals. Inspect for loose, broken, or burnt wire connections. Check and confirm that LCD readings are correct. Pay attention to any troubleshooting or error indications .Take corrective action as necessary. Confirm that all the system components are ground connected tightly and correctly. Confirm that all the terminals have no corrosion, insulation damage, signs of high temperature or discoloration. Check for dirt, insect infestation (particularly ants and mud hornet nests blocking airflow) and corrosion. If so, correct immediately. Check and confirm that lightning arrester is in good condition if used. WARNING:Risk of electric shock! Make sure that all the power is turned off before above operations, and then follow the corresponding inspections and operations. Page 23 5. Technical Specifications Electrical Parameters *Please operate controller at permitted ambient temperature. If over permissible range, please derate capacity in service.

Nominal system voltage 12/24VDC Automatic Switching

Rated Charge Current 20A Rated Discharge Current 20A Battery Input Voltage Range 8V to 32V

Max Solar open Circuit Voltage 100V Max (at -25ºC) 92V (at 25 ºC)

MPPT Voltage Range 12V Battery: 14V to 72V 24V Battery: 26V to 72V Max Solar Input Power 260W/12V 520W/24V

Controller current consumption Temperature Compensation Coefficient ≤20mA(12V) ≤16mA(24V) -3mV/ºC/2V(Default)

Communication RS485 (RJ45 interface) Grounding Common positive Overall Dimensions 220mm x154mm x 52mm Mounting dimensions 170mmx145mm Mounting hole size 5mm Power Terminals 6AWG(16mm2) Max wire size Weight 1.1kg Page 24 Appendix 1. Conversion Efficiency Curves 1. Solar Module MPP Voltage (33V, 68) / Nominal System Voltage (24V) Page 25

Appendix 2: Dimensions Dimensions in millimetres Page 26 Appendix 3: How to set battery parameters via WiFi APP NOTE: This operation requires MP3746 (sold separately) (eBOx-WIFI-01 WiFi Connection Module) to be connected to MP3741 Download and install this software:Li-WIFI&BLE (Android system) Depending on the Android version you have you may need the following steps: On some phones the App may not immediately connect with eBOx-BLE-01 or eBOx-WIFI-0This is because new phones are more sensitive to privacy issues so the APP is often un-truby default. So to use it you may need to set the trust option as follows: 1. Open Settings and click “APPs & notifications” followed by “enter” Page 27

2. Click “Permissions”

3. Find EPEVER (WiFi) and click it Page 28 4. Find “Set individual permissions” and click it. 5. “Trust this app” is disabled by default; switch it on by swiping switch symbol to the right 6. The APP should then work normally. Then open WIFI or Bluetooth, but don’t enter password yet! Page 29

Step 1: Select WIFI or BLE Page 30

Step 2: Click Read, you should receive a prompt: “Success”. Page 31 Step 3: Click Battery Settings Page 32 Step 4: Click Read, if all goes well, you will receive a prompt: “success”. Page 33 Step 5: Modify below parameters according to your Lithium battery specification. Page 34 Step 6: Modify below parameters according to you Lithium battery specification. Lithium battery parameters The parameters are in 12V system at 25°C, please double the values in 24V system and quadruple the values in 48V system. Page 35 Voltage LiFePO4 Li(NiCoMn)O2 User Over Voltage Disconnect Voltage 15.6V 13.5V 9~17V Charging Limit Voltage 14.6V 12.6V 9~17V Over Voltage Reconnect Voltage 14.7V 12.7 9~17V Equalize Charging Voltage 14.5V 12.5V 9~17V Boost Charging Voltage 14.5V 12.5V 9~17V Float Charging Voltage 13.8V 12.2V 9~17V Boost Reconnect Charging Voltage 13.2V 12.1V 9~17V Low Voltage Reconnect Voltage 12.8V 10.5V 9~17V Under Voltage Warning Reconnect Voltage 12.8V 11.0V 9~17V Under Voltage Warning Voltage 12.0V 10.5V 9~17V Low Voltage Disconnect Voltage 11.1V 9.3V 9~17V Discharging Limit Voltage 10.6V 9.3V 9~17V The following rules must be observed when modifying the parameter values in User for lithium battery. I. Over Voltage Disconnect Voltage>Over charging protection voltage(Protection Circuit Modules(BMS))+0.2V※; II. Over Voltage Disconnect Voltage>Over Voltage Reconnect Voltage= Charging Limit Voltage ≥ Equalize Charging Voltage =Boost Charging Voltage ≥ Float Charging Voltage>Boost Reconnect Charging Voltage; III. Low Voltage Reconnect Voltage>Low Voltage Disconnect Voltage ≥ Discharging Limit Voltage; IV. Under Voltage Warning Reconnect Voltage>Under Voltage Warning Voltage≥ Discharging Limit Voltage; V. Boost Reconnect Charging voltage> Low Voltage Reconnect Voltage; VI. Low Voltage Disconnect Voltage ≥ Over discharging protection voltage (BMS)+0.2V※. Page 36 Step 7: Click Send, you should get a prompt: “Success”. Page 37 Step 8: Read again, check parameters are correct. Page 38

Appendix 4. Solar Controller Monitor for MP3741 (RS-485/USB) using USB Cable adaptor (MP3747) Allows reading and writing data using a PC. Requires Communication cable CC-USB RS485-150U USB to PC RS485 for MP3741 Solar Charge Controller. The controller has a proprietary RJ45 connector with a digital output of the system values using RS-485 protocol. The communication cable together with the PC Software allows it to connect to a Windows PC and to read and to write the data from/to the MP3741 controller. Product monitors the following values of battery voltage and current: • Battery Voltage • Solar Module Voltage • Load Current • Over Discharge Voltage • Full Voltage • Temperature • Charging Current Page 39

The communication cable is supplied with PC software to read/write the data. This application is provided as it is, free of charge. The application is a property of the manufacturer of EP Solar and is provided “as it is” - all software related issues need to be handled with the manufacturer. Check more details for the Tracer on GWL/Blog Page 40

How to set Li battery parameter via PC software Download and install software from here: epsolarpv.com/upload/file/1811/Controller-PCTools-V1.93.zip Step 1: Click Parameters-Control Parameter-Control Parameter (For Li Battery controller product) Page 41 Step 2: Click Read, wait for “success” prompt… Page 42

Step 3: Modify below parameters according to your Lithium battery specification. Lithium battery parameters The parameters are in 12V system at 25°C, please double the values in 24V system and quadruple the values in 48V system. Page 43 Voltage LiFePO4 Li(NiCoMn)O2 User Over Voltage Disconnect Voltage 15.6V 13.5V 9~17V Charging Limit Voltage 14.6V 12.6V 9~17V Over Voltage Reconnect Voltage 14.7V 12.7 9~17V Equalize Charging Voltage 14.5V 12.5V 9~17V Boost Charging Voltage 14.5V 12.5V 9~17V Float Charging Voltage 13.8V 12.2V 9~17V Boost Reconnect Charging Voltage 13.2V 12.1V 9~17V Low Voltage Reconnect Voltage 12.8V 10.5V 9~17V Under Voltage Warning Reconnect Voltage 12.8V 11.0V 9~17V Under Voltage Warning Voltage 12.0V 10.5V 9~17V Low Voltage Disconnect Voltage 11.1V 9.3V 9~17V Discharging Limit Voltage 10.6V 9.3V 9~17V The following rules must be observed when modifying the parameter values in User for lithium battery. I. Over voltage(Protection Circuit Modules(BMS))+0.2V※; II. Over Voltage Disconnect Voltage>Over Voltage Reconnect Voltage= Charging Limit Voltage ≥ Equalize Charging Voltage =Boost Charging Voltage ≥ Float Charging Voltage>Boost Reconnect Charging Voltage; III. Low Voltage Reconnect Voltage>Low Voltage Disconnect Voltage ≥ Discharging Limit Voltage; IV. Under Voltage Warning Reconnect Voltage>Under Voltage Warning Voltage≥ Discharging Limit Voltage; V. Boost Reconnect Charging voltage> Low Voltage Reconnect Voltage; VI. Low Voltage Disconnect Voltage ≥ Over discharging protection voltage (BMS)+0.2V※. Page 44

Step 4: Click Updated, wait for “success” prompt… Page 45 Step 5: Click Read again, re-check parameters are correct then click to close. Page 46

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