PowerTech MP3741 User Manual
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PowerTech MP3741 User Manual

Mppt solar charge controller
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MP3741 MPPT Solar Charge Controller
User Manual
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Summary of Contents for PowerTech MP3741

  • Page 1 MP3741 MPPT Solar Charge Controller User Manual Page 1...
  • Page 2 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.

  • Page 3: Table Of Contents

    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...

  • Page 4: General Information

    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.

  • Page 5: General Appearance And Connections

    1.2 General Appearance and Connections Figure 1-1 MP3741 Connections Item Name Item Name ① ⑥ Mounting hole (5mm) Load Terminals ② ⑦ RS-485 Port Select Button Remote Temperature ③ ⑧ Sensor Socket Enter Button PV (Solar) Power Input ④ ⑨...

  • Page 6: Available Accessories

    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.
  • Page 7 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.

  • Page 8: Battery Charging Stage

    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.
  • Page 9 • 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.

  • Page 10: Installation Instructions

    • 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 11: Solar Array Requirements

    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.

  • Page 12: Mounting

    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.

  • Page 13: Operation

    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.
  • Page 14 Status Item Icon Status PV (Solar) array Night No charging Charging PV Voltage, Current, Power Battery capacity, In Charging Battery 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...
  • Page 15 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.

  • Page 16: Parameters Setting

    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.
  • Page 17 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.
  • Page 18 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 Power supply output +5V Power supply output +5V RS-485-B RS-485-B RS-485-A RS-485-A...

  • Page 19: Battery Type

    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...

  • Page 20: Protection Systems, Troubleshooting And Maintenance

    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.
  • Page 21 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.

  • Page 22: Troubleshooting

    4.2 Troubleshooting Faults Possible reasons Troubleshooting The LCD is off during daytime when sunshine is Confirm that Solar and battery Solar array falling on wire connections are correct disconnection on Solar panels and tight Wire connection is Please check the voltage of battery.

  • Page 23: Maintenance

    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.

  • Page 24: Technical Specifications

    5. Technical Specifications Electrical Parameters *Please operate controller at permitted ambient temperature. If over permissible range, please derate capacity in service. Nominal system 12/24VDC Automatic Switching voltage Rated Charge Current Rated Discharge Current Battery Input Voltage Range 8V to 32V Max Solar open Circuit 100V Max (at -25ºC) Voltage...

  • Page 25: Appendix 1 Conversion Efficiency Curves

    Appendix 1. Conversion Efficiency Curves 1. Solar Module MPP Voltage (33V, 68) / Nominal System Voltage (24V) Page 25...

  • Page 26: Appendix 2 Dimensions

    Appendix 2: Dimensions Dimensions in millimetres Page 26...

  • Page 27: Appendix 3. How To Set Battery Parameters Via Wifi App

    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...
  • Page 28 2. Click “Permissions” 3. Find EPEVER (WiFi) and click it Page 28...
  • Page 29 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...
  • Page 30 Step 1: Select WIFI or BLE Page 30...
  • Page 31 Step 2: Click Read, you should receive a prompt: “Success”. Page 31...
  • Page 32 Step 3: Click Battery Settings Page 32...
  • Page 33 Step 4: Click Read, if all goes well, you will receive a prompt: “success”. Page 33...
  • Page 34 Step 5: Modify below parameters according to your Lithium battery specification. Page 34...
  • Page 35 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...
  • Page 36 Voltage LiFePO4 Li(NiCoMn)O2 User Over Voltage Disconnect 9～17V 15.6V 13.5V Voltage 9～17V Charging Limit Voltage 14.6V 12.6V Over Voltage Reconnect 9～17V 14.7V 12.7 Voltage 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 Boost Reconnect Charging...
  • Page 37 Step 7: Click Send, you should get a prompt: “Success”. Page 37...
  • Page 38 Step 8: Read again, check parameters are correct. Page 38...

  • Page 39: Appendix 4. Solar Control Monitor For Mp3741

    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.
  • Page 40 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.
  • Page 41 How to set Li battery parameter via PC software Download and install software from here: https://www.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...
  • Page 42 Step 2: Click Read, wait for “success” prompt… Page 42...
  • Page 43 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...
  • Page 44 Voltage LiFePO4 Li(NiCoMn)O2 User Over Voltage Disconnect 9～17V 15.6V 13.5V Voltage 9～17V Charging Limit Voltage 14.6V 12.6V Over Voltage Reconnect 9～17V 14.7V 12.7 Voltage 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 Boost Reconnect Charging...
  • Page 45 Step 4: Click Updated, wait for “success” prompt… Page 45...
  • Page 46 Step 5: Click Read again, re-check parameters are correct then click to close. Page 46...
  • Page 47 Distributed by: TechBrands by Electus Distribution Pty. Ltd 320 Victoria Rd, Rydalmere NSW 2116 Australia Ph: 1300 738 555 Int’l: +61 2 8832 3200 Fax: 1300 738 500 www.techbrands.com Made in China Page 47...

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