Epever KR3522-1250P20C User Manual
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Epever KR3522-1250P20C User Manual

Inverter/charger
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Inverter/charger
User Manual
KR3522-1250P20C，KRP3522-1250P20C
KR3542-0650P20C，KRP3542-0650P20C
KR5542-1050P20C，KRP5542-1050P20C

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Summary of Contents for Epever KR3522-1250P20C

  • Page 1 Inverter/charger User Manual KR3522-1250P20C，KRP3522-1250P20C KR3542-0650P20C，KRP3542-0650P20C KR5542-1050P20C，KRP5542-1050P20C...

  • Page 2: Table Of Contents

    Contents Important Safety Instructions..............1 Disclaimers....................5 1 General Information.................6 1.1 Overview............................6 1.2 Appearance...........................9 1.3 Naming rules..........................12 1.4 Connection diagram......................... 13 2 Interface....................15 2.1 Indicator............................15 2.2 Buttons............................16 2.3 Home screen..........................16 2.4 Real-time data..........................20 2.4.1 PV real-time data......................20 2.4.2 Utility real-time data......................
  • Page 3 3.2 Wire and breaker size.......................63 3.3 Mounting the inverter/charger....................65 3.4 Wiring the inverter/charger.....................66 3.5 Operate the inverter/charger....................76 4 Working modes..................77 4.1 Abbreviation..........................77 4.2 Off-Grid working modes......................78 4.2.1 Battery mode........................78 4.2.2 No battery mode.......................84 5 Protections....................86 6 Troubleshooting..................

  • Page 4: Important Safety Instructions

    Important Safety Instructions Please reserve this manual for future review. This manual contains all the safety, installation, and operation instructions for the KR/KRP-P20C series inverter/charger ("inverter/charger" referred to as this manual). 1. Explanation of symbols To enable users to use the product efficiently and ensure personal and property safety, please read the related words carefully when you encounter the following symbols in the manual.
  • Page 5 4. Safety cautions before installation When receiving the inverter/charger, please check if there is any damage in transportation. If you find any problem, please contact the transportation company or CAUTION our company in time.  When installing or moving the inverter/charger, follow the instructions in the manual.
  • Page 6 7. Safety cautions for inverter/charger operation When the inverter/charger works, the shell will generate much heat, and the WARNING temperature is very high. Please do not touch it, and keep it far from the equipment susceptible to high temperature. SURFACE ...
  • Page 7 Improper maintenance of the inverter/charger may cause personal injury or equipment damage;  It is recommended to wear an antistatic wrist strap or avoid unnecessary contact with the circuit  board. The safety mark, warning label, and nameplate on the inverter/charger should be visible, not removed or covered.

  • Page 8: Disclaimers

    Disclaimers The warranty does not apply to the following conditions: Damage caused by improper use or inappropriate environment (it is forbidden to install the  inverter/charger in humid, salt spray, corrosion, greasy, flammable, explosive, dust accumulative, or other severe environments). The actual current/voltage/power exceeds the limit value of the inverter/charger.

  • Page 9: General Information

    1 General Information 1.1 Overview KR/KRP-P20C series, upgraded Off-Grid inverter/chargers that support utility charging, oil generator charging, solar charging, utility output, inverter output, and energy management. Equipped with main AC output and second AC output. After enabling the low-power mode on the LCD, the inverter/charger can enter the low-power mode according to the battery voltage and output power.
  • Page 10 where the electricity is unstable. Features  Full intelligent digital energy storage equipment.  Applicable for pure off grid/ backup power / self-generation and self-consumption situation.  Support battery mode or non-battery mode.  Non-battery mode: simultaneously charging with solar (Main) and Utility (Assist). ...
  • Page 11  Comprehensive electronic protection.  Anti-reverse connection protection for the battery input and PV input  -20℃ to +50℃ operating temperature range to meets more environment requirements.  IP20 enclosure design with Anti-Dust Kit (Dust removal is required regularly, and the specific requirements are detailed in chapter 7 Maintenance).

  • Page 12: Appearance

    1.2 Appearance  KR3522-1250P20C/KRP3522-1250P20C/KR3542-0650P20C/KRP3542-0650P20C...
  • Page 13 KR5542-1050P20C/KRP5542-1050P20C ...
  • Page 14 RS485-A RS485-B RS485-B Please go to EPEVER official website to check or download the currently supported BMS manufacturers and the BMS parameters. (2) Dry contact specification: 1A@125VAC. Function: The dry contact interface is connected with the generator switch to turn on/off the generator.

  • Page 15: Naming Rules

    Definition Definition HFS-BUS CAN-L PFS-BUS CAN-H PS-GND 6/7/8/9 Reserved 1.3 Naming rules Naming rules for KR-P20C series  Naming rules for KRP-P20C series ...

  • Page 16: Connection Diagram

    1.4 Connection diagram No battery mode ...
  • Page 17 Battery mode  AC loads shall be determined according to the output power of the inverter/charger. WARNING The load exceeding the maximum output power may damage the inverter/charger.  For different battery types, confirm the relevant parameters before power on. ...

  • Page 18: Interface

    2 Interface Note: The display screen can be viewed clearly when the angle between the end-user's horizontal sight and the display screen is within 90°. If the angle exceeds 90°, the information on the display screen cannot be viewed clearly. 2.1 Indicator Indicator Status...

  • Page 19: Buttons

    Green flashing (0.5Hz) Normal communication Red ON Communication fault 2.2 Buttons Buttons Operation Instruction Click Exit the current interface and return to home screen. Turn ON/OFF the load switch. Short press this button to pop up the following prompt message. Click ON/OFF to turn on/off the load switch. If set to "OFF", it will automatically return to "ON"...
  • Page 20 Instruction ❶ Display the system time. Please set the system time correctly before use. Displays the battery discharge mode. For specific parameter settings, see 2.5.1 Parameter list > 5. System (System parameter ❷ setting). PV > BP > BT PV > BT > BP BP >...
  • Page 21 Click the PV icon to enter the PV real-time data screen, see 2.4.1 PV real-time data for details. Display utility input voltage and utility input current.  The direction of the arrow shows the energy flow state of the  utility input.
  • Page 22 Display the output voltage and output current of the load.  The arrow direction indicates the energy flow state of the load.  The arc represents the percentage of the current load  power to the rated load power. Display the load status: indicates that the load is on, ...

  • Page 23: Real-Time Data

    Indicates that a fault has occurred in the current system. Click this icon to view real-time fault. For specific operations, see 2.4.6 Real-time error code. ⓬ Indicate turning on the 5V power supply of the inverter/charger’s COM port, which can be connected to an external Bluetooth or WiFi module.

  • Page 24: Utility Real-Time Data

    Icon Instruction 1. PV input voltage, PV input current 2. PV energy flow indication 3. PV real-time power Note: If there is only one PV input, only one PV icon will be displayed here. 1. Total PV generation (not displayed if there is only one PV input) 2.

  • Page 25: Inverter/Charger Real-Time Data

    Icon Instruction 1. Utility input voltage, current, frequency 2. Utility energy flow instructions 3. Utility consumption power Swipe up and down in this area to see all the settings of the utility. Refer to "2.5.1 Parameter list > 3. Grid (Grid parameter setting)" to view the default values and setting range of all utility parameters.

  • Page 26: Load Real-Time Data

    2.4.4 Load real-time data On the home screen, touch to enter the load real-time data screen. Click Fun to display the Payload Real-time Data, Setting Parameters To Display page, and Parallel Real-Time Data page. Click Page to display all the information for the current page. 2.4.5 Battery real-time data On the home screen, touch to enter the battery real-time data screen.
  • Page 27 To display the SOC value of the battery, click this icon to display the following BMS State screen, see Battery state instruction in Appendix 2 for details. Click Up / Down to display other page, and click Back to return to the battery real-time data screen.

  • Page 28: Real-Time Error Code

    2.4.6 Real-time error code If there is no fault in the current system, will be displayed on the home screen. If there is a fault in the current system, will be displayed on the home screen. Touch this icon to enter the real-time error code screen.
  • Page 29 2. Enter the password input screen, enter the 1. On the home screen, click in the correct password (the initial password is 000000 upper-right corner. by default), and click to enter the parameter setting screen. The parameter setting screen includes: PV (PV parameter setting), Charge (battery charge control parameter setting), Grid (Grid parameter setting), Load (Load parameter setting), System (System parameter setting), Others (Other parameters setting) and password setting.
  • Page 30 1. PV (PV parameter setting) On the parameter setting screen, click PV to enter the PV parameter setting screen. The following information is displayed: Icon Instruction Default values and settable ranges of PV parameters. Swipe up and down to view all the parameters on the current page. indicates that the parameter value can be customized (If the parameter is read-only, there is no icon).
  • Page 31 Read-only. PV Over Temperature Protection Temperature Protection Temperature) 70.0℃ for KR3522-1250P20C/KRP3522-1250P20C/ KR3542-0650P20C/KRP3542-0650P20C. Read-only. PV Over Temperature Protection Reconnect 70.0℃ Temperature for KR5542-1050P20C/ OTPR (Over KRP5542-1050P20C. Temperature Protection Read-only. PV Over Temperature Protection Reconnect Reconnect Temperature) Temperature for KR3522-1250P20C/ 65.0℃ KRP3522-1250P20C/KR3542-0650P20C/ KRP3542-0650P20C.
  • Page 32 2. Charge (Battery charge control parameter setting) On the parameter setting screen, click Charge to enter the battery charge control parameter setting screen. The following information is displayed: Icon Instruction Default values and settable ranges for battery voltage/SOC control parameters. Swipe up and down to view all the parameters on the current page.
  • Page 33 Parameter Default User define 60.0V User define: (Discharging Limit Voltage plus 0.15*N) ≤ OVR (Over Voltage (48V system) Over Voltage Reconnect Voltage ≤ (Over Voltage Reconnect Voltage) Disconnect Voltage minus 0.1*N), step size: 0.1V. Note: 30.0V (24V system) N=Rated battery voltage/12. 58.4V User define: Boost Charging Voltage ≤...
  • Page 34 Parameter Default User define User define: (Discharging Limit Voltage plus 0.1*N) ≤ Under Voltage Warning Voltage ≤ (Under Voltage 48.0V Warning Reconnect Voltage minus 0.1*N), step size: (48V system) 0.1V UVW (Under Voltage Note: N=Rated battery voltage/12. This voltage is also Warning Voltage) the disconnect voltage for the AC output main 24.0V...
  • Page 35 Parameter Default User define 2.2 SOC Control Strategy It takes effect after the “BCCMode” is set as “SOC.” When the battery SOC is higher than or equals to this value, the inverter/charger will stop charging the FCP (Full Charging battery. 100% Protection SOC) User define: (Full Charging Protection Reconnect SOC...
  • Page 36 Parameter Default User define It takes effect after the “BCCMode” is set as “SOC.” User define: 20% to 50%, or 20% to (Utility Charging UAC ON (Utility OFF SOC minus 10%), step size: 1% Charging ON SOC) Note: Take the minimum value between 50% and (Utility Charging OFF SOC minus 10%).
  • Page 37 Default value and setting range for Grid parameters as shown in the below:  Parameter Default User define 3.1 Grid Setting Parameter UOD (Utility Over Voltage User define: (Utility Over Voltage Reconnect Voltage 265.0V Disconnect Voltage) plus 10V) to 285.0V, step size: 0.1V UOR (Utility Over Voltage User define: 220.0V to (Utility Over Voltage Disconnect 255.0V...
  • Page 38 (Enter into the “Load Setting Parameter” screen again to check if the change has been changed). Read-only. Load Current Limit for 35.0A KR3522-1250P20C/KRP3522-1250P20C/ KR3542-0650P20C/KRP3542-0650P20C. Load CL (Load Current Limit) Read-only. Load Current Limit for 42.0A KR5542-1050P20C/KRP5542-1050P20C.
  • Page 39 Voltage) Read-only. Temperature Upper Limit for 75.0℃ KR5542-1050P20C/KRP5542-1050P20C. TempUL (Temperature Read-only. Temperature Upper Limit for Upper Limit) 70.0℃ KR3522-1250P20C/KRP3522-1250P20C/KR3542-0 650P20C/ KRP3542-0650P20C. Read-only. Temperature Upper Limit Recovery for 70.0℃ KR5542-1050P20C/KRP5542-1050P20C. TempULR (Temperature Read-only. Temperature Upper Limit Recovery for Upper Limit Recovery) 65.0℃...
  • Page 40 User define: 5.0A to 100.0A for KR5542-1050P20C/ 100.0A Available Charging KRP5542-1050P20C, step size: 0.1A. Namely, the Current) maximum allowable charge current on battery side. User define: 5.0A to 120.0A for KR3522-1250P20C/ 120.0A KRP3522-1250P20C, step size: 0.1A. Namely, the maximum allowable charge current on battery side.
  • Page 41 Available Discharging Namely, the maximum allowable discharge current Current) on battery side. User define: 10.0A 380.0A KR3522-1250P20C/ KRP3522-1250P20C, step 380.0A size: 0.1A Namely, the maximum allowable discharge current on battery side. BECT (Battery Equalize User define: 10minutes to 180 minutes, step size: 1...
  • Page 42 Parameter Default User define BATT OTPR (Battery Over User define: 30.0 ℃ to (Battery Over Temperature 45.0 ℃ Temperature Protection Protection minus 5 ℃ ), step size: 0.1 ℃ Recovery) Chrg (Charging) Enable Read-only Dischrg (Discharging) Enable Read-only User define: Disable, Enable Note: The parameter will only take effect when used PCUP (Phase Current in three phase.
  • Page 43 Otherwise, the “BACC” value equals the setting Read-only, the maximum allowable charge current value of “LBACC” after 120.0A battery side KR3522-1250P20C/ each power-on. If KRP3522-1250P20C. “LBACC” is changed without a subsequent restart, the “BACC” value remains the previous value of “LBACC”.
  • Page 44 100.0A Charging Current) Namely, the maximum current at the battery end when the utility charges the battery. User define: 5.0A to 110.0A for KR3522-1250P20C/ KRP3522-1250P20C, step size: 0.1A 110.0A Namely, the maximum current at the battery end when the utility charges the battery.
  • Page 45 Parameter Default User define User define: Grid, Oil When the AC input is an oil generator, this parameter needs to be set to "Oil" to improve the charging capability. Note: If the AC input mode does ACmode (AC Input Mode) Grid not match the AC source of the actual input, the normal operation of the inverter/charger will be...
  • Page 46 Parameter Default User define User define: Invalid, BMS Set this value as "Invalid," the inverter/charger BMSCurr (BMS Current controls the charge and discharge according to the Invalid Control) value set on the LCD. Set this value as "BMS," the inverter/charger controls the charge and discharge according to the read BMS value.
  • Page 47 Parameter Default User define Com BPS User define: 9600, 19200, 38400, 57600, 115200, (Communication Baud 115200bps 256000 Rate) 44.0V User define: 9*N to (Dry Contract OFF Voltage (48V system) minus 0.2*N), step size: 0.1V. Note: N=Rated DCT ON (Dry Contract ON battery voltage/12.
  • Page 48 6. Others (Other parameters setting) On the parameter setting screen, click Others to enter other parameters setting screen. The following information is displayed: Click to switch the page and set the relevant parameters directly via the touch screen operation. Default value and setting range for other parameters as shown in the below: ...
  • Page 49 Parameter Default User define User define: ECO Mode, Normal Mode When set as "ECO Mode," the inverter/charger will enter the low power mode when certain conditions are met, such as no PV and utility, and the battery voltage drops to the low Low Power Mode ECO Mode voltage disconnect voltage.
  • Page 50 7. Set password 1. On the parameter setting page, click Set 2. Enter original password, password, and click to enter the Password to enter the password modifying screen. screen of re-entering the password. 4. Enter the new password and click 3.
  • Page 51 2. Enter the password input screen, click 1. On the home screen, click in the upper-right corner. the right screen, and then, click to enter the “Quick Setting Of BMS Parameters” setting screen. 3. Select the “Battery Type” and “Protocol Number” according the actual situation, and click to back to the home screen.

  • Page 52: Battery Work Modes

    The above parameters can be modified separately on the administrator screen, please refer to 2.5.1 Parameter list for detailed settings. Default value and setting range for BMS related parameters as shown in the below:  Parameter Default User define 8. Quick Setting Of BMS Parameters 48V battery type: AGM, OPZS, GEL, FLD, LFP15S, LFP16S, LNCM13S, LNCM14S Battery Type...
  • Page 53 charge and discharge values. control function” 2. Normal communication 1. Lithium battery pack with Figure “Setting BMS, without current The inverter/charger controls process for lithium battery control function at the end charging discharging pack with BMS, without of charge and discharge based on the LCD settings.
  • Page 54 3. Slide up and down on the current screen, 4. Depending on the battery actually used, set and click System to enter the system parameter "BDCap (Battery Design Capacity) and BType setting screen. (Battery Type)". After the settings are complete, click to issue new parameter value.
  • Page 55 as lithium battery, otherwise the lithium battery data cannot be read. To set as “VOLT” or “SOC.” And then set BCCMode (Battery Charging Control the battery voltage control parameters or Mode) Charge and SOC control parameters.. Discharge Set the settings according to the actual BMSProt (BMS Protocol) Management battery protocol number used.
  • Page 56 BMSVolt (BMS Voltage Control), BMSCurr (BMS Current Control)." After the settings are complete, click to issue new parameters. Please go to EPEVER official website to download the currently supported BMS manufacturers and the BMS parameters. The inverter/charger will control charging and discharging based on the LCD ...
  • Page 57 To set as “VOLT” or “SOC.” And then set BCCMode (Battery Charging the battery voltage control parameters or Control Mode) SOC control parameters. Charge and Discharge Set the settings according to the actual Management BMSProt (BMS Protocol) battery protocol number used. BMS (BMS Enable) Enable BMSVolt (BMS Voltage...
  • Page 58 5. Click to switch to the "Charge and Discharge Management" interface and set "BCCMode (Battery Charging Control Mode), BMSProt (BMS Protocol), BMS (BMS Enable), and BMSVolt (BMS Voltage Control)." After the settings are complete, click to issue new parameter value. The inverter/charger will control charging and discharging based on the LCD settings after setting the “BMSCurr (BMS Current Control)”...
  • Page 59 2. Enter the password input screen, enter the 1. On the home screen, click in the correct password (the initial password is 000000 upper-right corner. by default), and click enter the parameter setting screen. 3. Slide up and down on the current screen, 4.

  • Page 60: Battery Voltage Control Parameters

    Low Voltage Disconnect Voltage 20.3V 20.3V 20.3V 20.3V Fix value Discharging Limit Voltage When the battery voltage is lower than 21.6V, the battery inverter output must be derated. Curve of Continuous output power Vs battery voltage for KR3522-1250P20C/KRP3522-1250P20C as below:...
  • Page 61 The parameters are measured in the condition of 48V/25 ºC. Battery Type OPZS User define Voltage control parameters 64.0V 64.0V 64.0V 64.0V 42.8–64V Over Voltage Disconnect Voltage 60.0V 60.0V 60.0V 60.0V 42.8–64V Charging limit voltage 60.0V 60.0V 60.0V 60.0V 42.8–64V Over Voltage Reconnect Voltage 58.4V 58.4V...
  • Page 62 The following rules must be obeyed when setting the Lead-acid battery voltage control parameters. A． Over Voltage Disconnect Voltage > Charging Limit Voltage ≥ Equalize Charging Voltage ≥ Boost Charging Voltage ≥ Float Charging Voltage > Boost Voltage Reconnect Voltage B．...
  • Page 63 Under Voltage Warning Recover 25.6V 21.5–32V 48.0V 51.2V 42.8–64V Voltage Under Voltage Warning Voltage 24.8V 21.5–32V 46.5V 49.6V 42.8–64V Low Voltage Disconnect Voltage 23.2V 21.5–32V 43.5V 46.4V 42.8–64V Discharging Limit Voltage 22.0V Fix value 41.2V 44.0V Fix value Battery Type 24V system 48V system LNCM6S...
  • Page 64 Modules) plus 0.2V The BMS circuit protection module's voltage control accuracy must be at least ±0.2V. The [Over Voltage Disconnect Voltage] shall be lower than the protection voltage of the BMS circuit protection module. In contrast, the [Low Voltage Disconnect Voltage] shall be higher.

  • Page 65: Single Installation

    3 Single Installation 3.1 Attention  Please read the manual carefully to familiarize yourself with the installation steps. Be very careful when installing the batteries, especially flooded lead-acid batteries. Please wear eye  protection, and have fresh water available to rinse if contact with battery acid. ...

  • Page 66: Wire And Breaker Size

    PV module's Isc. The PV array's Isc must not exceed the maximum PV input current. For max. PV input current and max. PV wire size, please refer to the table below: Model PV wire size Circuit breaker KR3522-1250P20C /11AWG 2P—20A (with arc extinguishing function) KR3542-0650P20C KRP3522-1250P20C /10AWG 2P—25A (with arc extinguishing function)
  • Page 67 When the PV modules are connected in series, the total voltage must not exceed the max. PV open circuit voltage 500V (At minimum operating environment temperature), CAUTION or 440V (At 25℃). Recommended Utility wire size  Model Utility wire size Circuit breaker KR3522-1250P20C KR3542-0650P20C /10AWG 2P—32A KRP3522-1250P20C KRP3542-0650P20C KR5542-1050P20C 10mm /7AWG 2P—50A...

  • Page 68: Mounting The Inverter/Charger

     The above wire and circuit breaker sizes are for reference only; please choose a suitable wire and circuit breaker according to the actual situation. 3.3 Mounting the inverter/charger Risk of explosion! Never install the inverter/charger in a sealed enclosure with flooded batteries! Do not install the inverter/charger in a confined area where the battery gas WARNING can accumulate.

  • Page 69: Wiring The Inverter/Charger

    Connect the inverter/charger in the order of “❶Ground > ❷Battery > ❸Load > ❹PV ❺Utility or Generator > ❻Optional accessories”, and disconnect the inverter/charger in the reverse > order. following wiring sequence illustrated appearance "KR3522-1250P20C/KRP3522-1250P20C/KR3542-0650P20C/KRP3542-0650P20C." For wiring positions of other models, please refer to the actual product appearance.
  • Page 70 No battery mode ...
  • Page 71 Battery mode  Grounding The inverter/charger has a dedicated grounding terminal, which must be grounded reliably. The grounding wire size must be consistent with the recommended load wire size. The grounding connection point shall be as close as possible to the inverter/charger, and the total grounding wire shall be as short as possible.
  • Page 72  Do not ground the AC input L or N terminals between the inverter/charger and the household power distribution cabinet.  Do not ground the AC output L or N terminals.   The cabinet of the inverter/charger is connected to earth through the earth Grounding rail, along with the AC input and output's PE (Protective Earth) terminal.
  • Page 73 Connect the AC load  Risk of electric shock! When wiring the AC load, please disconnect the circuit breaker and ensure that the poles' leads are connected correctly.  The AC loads shall be determined by the continuous output power of the inverter/charger.
  • Page 74 main power-off relay will be disconnected after a 5-second delay. Once the battery voltage rises above the LVR (Low Voltage Reconnect Voltage), the AC output main power-off relay will be reconnected after a 5-minute delay, restoring the output of the AC output main load interface. When the battery voltage is lower than the LVD (Low Voltage Disconnect Voltage), there is no output at the AC output second load interface.
  • Page 75 AC OUTPUT (MAIN) connection  AC OUTPUT (SECOND) connection ...
  • Page 76 Connect the PV modules  Risk of electric shock! The PV array can generate dangerous high-voltage! Disconnect the circuit breaker before wiring, and ensure that the leads of "+" and "-" poles are connected correctly. WARNING  It is forbidden to connect the positive and negative poles of the PV with the ground; otherwise, the inverter/charger will be damaged.
  • Page 77  After the Utility is connected, the PV and battery cannot be grounded. In contrast, the inverter/charger cover must be grounded reliably (to shield the outside electromagnetic interference effectively and prevent the cover from causing electric shock to the human body). There are various types of oil generators with complex output conditions.
  • Page 78 Working principle:  When the battery voltage reaches the DCT ON (Dry Contact ON Voltage) the dry contact is connected. Its coil is energized. The dry contact can drive loads of no more than 125VAC /1A, 30VDC/1A. According to different battery types of the inverter charger, the default values of the DCT ON (Dry Contact ON Voltage) and the DCT OFF (Dry Contact OFF Voltage)are different.

  • Page 79: Operate The Inverter/Charger

    3.5 Operate the inverter/charger Step 1: Double-check whether the wire connection is correct. Step 2: Connect the battery circuit breaker. Step 3: Turn on the power switch. The LCD will be lit, which means the system running is normal. Power switch ...

  • Page 80: Working Modes

    4 Working modes 4.1 Abbreviation Abbreviation Instruction PV power Load power LOAD Battery voltage Low Voltage Disconnect Voltage Low Voltage Reconnect Voltage Low Energy Disconnect SOC Low Energy Disconnect Recover SOC AUX OFF Auxiliary module OFF voltage (namely, Utility charging OFF voltage) AUX ON Auxiliary module ON voltage (namely, Utility charging ON voltage) UAC OFF...

  • Page 81: Off-Grid Working Modes

    4.2 Off-Grid working modes 4.2.1 Battery mode Scenario A: Both PV and Utility are not available. Regardless of the input and output sources, the working mode is as follows. ❶Any of the following is satisfied, the battery supplies the load. ...
  • Page 82 ❷ When the PV power is lower than or equal to the load power, the PV will not charge the battery, the battery will cut in to supply power to the load together with the PV. ≥ LVR ≤ LVD / SOC ≥...
  • Page 83 ❸ Any of the following is satisfied, the Utility supplies power to the load, and the PV prioritizes charging the battery.  The battery voltage is lower than or equal to the LVD value.  The battery SOC is lower than or equal to the DP value.
  • Page 84 ❸ Any of the following is satisfied, the Utility supplies power to the load and charges the battery together with the PV.  The battery voltage is lower than or equal to the AUX ON value.  The battery SOC is lower than or equal to the UAC ON value.
  • Page 85 Discharging Mode: No impact under any Charging Mode: "Solar+Grid" ❶ When the PV power is greater than the mode (LBACC*V ), the Utility and PV supply power to the load, and the PV charges the battery simultaneously. （C-5）  > LBACC*V ≤...
  • Page 86 Discharging Mode: "PV>BP>BT" Charging Mode: "Solar" "BP>PV>BT" （D-2）  The Utility supplies power to the load.  Utility Charging Mode: "Solar > （D-3） Discharging Mode: "PV>BT>BP" ❶Any of the following is satisfied, the battery Grid"   Utility supplies the load. ...

  • Page 87: No Battery Mode

    ❷Any of the following is satisfied, the Utility supplies power to the load and charges the battery simultaneously.  The battery voltage is lower than or equal to the AUX ON value.  The battery SOC is lower than or equal to the UAC ON value.
  • Page 88 ❷When the PV power is lower than or equal to the load power, the PV and the Utility supply power to the load together.  Only the PV supplies power to the load.  Utility  Only the Utility supplies power to the load. ...

  • Page 89: Protections

    5 Protections Protections Instruction When the PV array's actual charging current/power exceeds its rated current/power, it will charge the battery as per the rated current/power. When the PV voltage exceeds the bus voltage, the PV input power is constrained PV limit Current/Power by the load power, charging power, the power that the solar panels can deliver, and the current of the PV circuit breaker.
  • Page 90 The inverter/charger will resume charging/discharging when the internal temperature is normal and the protection time lasts more than 20 minutes. 3605W≤P˂4550W 4550W≤P˂5250W 5250W≤P˂7000W P≥7000W KR3522-1250P20C KR3542-0650P20C Protect after 30 seconds Protect after 10 seconds Protect after 5 seconds Protect immediately...
  • Page 91 Protections Instruction 3850W≤P˂4795W 4795W≤P˂5495W 5495W≤P˂7000W P≥7000W KR3522-1250P20C KR3542-0650P20C Protect after 30 seconds Protect after 10 seconds Protect after 5 seconds Protect immediately KRP3522-1250P20C KRP3542-0650P20C Note: The output is recovered automatically after a delay time of 5s, 10s, and 15s separately. The Utility bypass overload inverter/charger stops working after the 4th protection and can resume working after resetting or restarting.
  • Page 92 Protections Instruction 8550W≤P˂9485W 9485W≤P˂10585W P≥10585W KR5542-1050P20C Protect after 30 seconds Protect after 10 seconds Protect immediately KRP5542-1050P20C Utility bypass overload Note: The output is recovered automatically after a delay time of 5s, 10s, and 15s separately. The (Battery mode) inverter/charger stops working after the 4th protection and can resume working after resetting or restarting.

  • Page 93: Troubleshooting

    6 Troubleshooting After the inverter/charger is powered on, the meter displays the boot screen all the time (unable to enter the home screen) and the red "RUN" indicator flashes. It means the communication with the inverter/charger is error. When the above fault occurs, check whether the CAUTION communication cable is disconnected.
  • Page 94 Error Fault/Status Indicator Buzzer Solution 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 Battery Over the setting values of "LBACC (Local Battery Available Charging Current) ER11 Temperature and LBADC (Local Battery Available Discharging Current)."...

  • Page 95: Pv Faults

    6.2 PV faults Error Fault/Status Indicator Buzzer Solution code Check if the PV open-circuit voltage is higher than OVP (Over Voltage Intermitte PV1 Overvoltage ER15 indicator Protection Voltage). The alarm is released when the PV open-circuit nt beeps red on voltage is below OVPR (Over Voltage Protection Reconnect Voltage).

  • Page 96: Inverter Faults

    6.3 Inverter faults Error Fault/Status Indicator Buzzer Solution code Check if the load actual power exceeds the "Inverter Rated Power (see chapter 8 Specifications)," disconnect the load completely and turn off Inverter Output ER02 the inverter/charger. Wait 5 minutes and then turn on the Overcurrent inverter/charger to check if it resumes normal.
  • Page 97 Error Fault/Status Indicator Buzzer Solution code Disconnect the load completely and turn off the inverter/charger. Wait 5 Inverter Current OFFSET ER35 minutes and then turn on the inverter/charger to check if it resumes Error normal. If it is still abnormal, please contact our technical support. LOAD Turn off the inverter/charger.Wait 5 minutes and then turn on the Inverter Temp Sensor...

  • Page 98: Utility Faults

    6.4 Utility faults Error Fault/Status Indicator Buzzer Solution code Check if the utility voltage is exceeds the UOD (Utility Over Voltage GRID Disconnect Voltage), then disconnect the AC input and turn off the Intermitte Utility Overvoltage ER08 indicator inverter/charger. Wait 5 minutes and then turn on the inverter/charger to nt beeps red on check if it resumes normal.

  • Page 99: Load Faults

    6.5 Load faults Fault/Status Error code Indicator Buzzer Solution Load Current ER33 Disconnect the load completely and turn off the inverter/charger. OFFSET Error Wait 5 minutes and then turn on the inverter/charger to check if it Load Over Load ER48 LOAD Intermitt resumes normal.

  • Page 100: Bms Faults

    Error Fault/Status Indicator Buzzer Solution code Turn off the inverter/charger. Wait 5 minutes and then turn on the Environment Temp ER42 inverter/charger to check if it resumes normal. If it is still abnormal, Sensor Disconnected please contact our technical support. Low Temperature ER46 Check whether the ambient temperature is lower than the set "LTSChrg...

  • Page 101: Maintenance

    7 Maintenance To prevent frequent over-heat protection of the inverter/charger, which may affect system reliability, it is recommended to clean the anti-dust kit once a month. In environments with high temperatures and severe dust pollution, it is advisable to clean the anti-dust kit every two weeks.

  • Page 102: Specifications

    8 Specifications 8.1 KR-P20C Series Model KR3542-0650P20C KR5542-1050P20C Utility input 176VAC to 264VAC (Default), 90VAC to 285VAC Utility Input Voltage (Configurable) Utility Input Frequency 45Hz to 65Hz Maximum Utility Charging 100A Current Switch Response Time – Inverter to Utility: 10ms Switch Response Time Switch Response Time –...
  • Page 103 512mm × 245mm 568mm × 245mm Mounting hole size Φ9mm/Φ10mm Φ9mm/Φ10mm Net Weight 12.7Kg 15.5Kg Model KR3522-1250P20C Utility input 176VAC to 264VAC (Default), 90VAC to 285VAC Utility Input Voltage (Configurable) Utility Input Frequency 45Hz to 65Hz Maximum Utility Charging 110A Current Switch Response Time –...
  • Page 104 Inverter output Inverter Rated Power (@30℃) 3500W 3-second Transient Surge Output 7000W Power Inverter Output Voltage 220/230VAC±3% Inverter Frequency 50/60Hz±0.2% Output Voltage Waveform Pure sine wave Load Power Factor 0.2–1(VA ≤ Rated output power) THDu (Total Harmonic Voltage ≤3% (24V resistive load) Distortion) Maximum Load Efficiency Maximum Inverter Efficiency...

  • Page 105: Krp-P20C Series

    Communication with Portal RS485 Parallel Function Yes, 12 units in standard, 16 units at most -20℃ to +50℃ (When the environment temperature exceeds Work Temperature Range 30℃, the actual output power is reduced appropriately) Storage Temperature Range -25℃ to +60℃ Enclosure IP20 (With ANTI-DUST KIT) Relative Humidity...
  • Page 106 Maximum Second Load 3500W 5500W Main Output Cut-Off Voltage Equal to “UVW (Under Voltage Warning Voltage)” Second Output Cut-Off Voltage Equal to “LVD (Low Voltage Disconnect Voltage)” Dual Output Recovery Voltage Equal to “LVR (Low Voltage Reconnect Voltage)” Solar controller Maximum Open-circuit 500V (At minimum operating environment temperature)
  • Page 107 Mounting size (Length x Width) 512mm × 245mm 568mm × 245mm Mounting hole size Φ9mm/Φ10mm Φ9mm/Φ10mm Net Weight 12.7Kg 15.5Kg Model KRP3522-1250P20C Utility input 176VAC to 264VAC (Default), 90VAC to 285VAC Utility Input Voltage (Configurable) Utility Input Frequency 45Hz to 65Hz Maximum Utility Charging 110A Current...
  • Page 108 MPPT Maximum efficiency ≥99.5% Battery Battery Rated Voltage 24VDC Battery Work Voltage Range 20.4VDC to 32.0VDC Battery Maximum Charging 120A Current Others ≤1.5A No-load Losses Test condition: Utility, PV and Load are disconnected, AC output is ON, fan stops, @24V input ≤1.1A Standby Current Test condition: Utility, PV and Load are disconnected, AC...

  • Page 109: Appendix

    9 Appendix 9.1 Appendix1 Abbreviations index Abbreviations Full name in English Over Voltage Protection Voltage OVPR Over Voltage Protection Reconnect Voltage Solar Setting Under Voltage Protection Voltage Parameter UVPR Under Voltage Protection Reconnect Voltage Over Temperature Protection Temperature OTPR Over Temperature Protection Recovery Temperature Over Voltage Disconnect Voltage Charging Voltage Limit Voltage Over Voltage Reconnect Voltage...
  • Page 110 Utility Over Voltage Disconnect Voltage Utility Over Voltage Reconnect Voltage Grid Setting ULVD Utility Low Voltage Disconnect Voltage Parameter ULVR Utility Low Voltage Reconnect Voltage Utility Over Frequency Disconnect Frequency Utility Under Frequency Disconnect Frequency INVOVL Inverter Output Voltage Level INVOFR Inverter Output Frequency Range Load CL...
  • Page 111 Management UACC Utility Available Charging Current CMode Charging Mode DMode Discharge Mode ACmode AC Input Mode PVMode PV Mode BCCMode Battery Charging Control Mode BMSProt BMS Protocol BMS Enable BMSVolt BMS Voltage Control BMSCurr BMS Current Control BMSFail BMS Fail Action Battery Connection Method LCD BRT LCD Brightness...

  • Page 112: Appendix 2 Battery State Instruction

    9.2 Appendix 2 Battery state instruction 2. Touch the to enter the battery state 1. On the screen, click the battery icon to enter the battery real-time data screen. screen. 3. The first page shows the “Battery State.” 4. Click Down button to shows the "Cell State" on second page.
  • Page 113 The detailed data of each interface is as follows: English display Description Green means this state has not occurred, red means this Charging state has occurred. After showing red, the inverter/charger protection turns off charging. Green means this state has not occurred, red means this Discharge state has occurred.
  • Page 114 proterct, Overvoltage protect, and Cell detection. After reading the undervoltage alarm or protection of the single cell, the inverter/charger turns off discharging. After reading the overvoltage alarm or protection of the single cell, the inverter/charger turns off charging. MOS Temperature State Normal display is green, abnormal display is red.
  • Page 116 HUIZHOU EPEVER TECHNOLOGY CO., LTD. Tel: +86-752-3889706 E-mail: info@epever.com Website: www.epever.com...

This manual is also suitable for:

Krp3522-1250p20cKr3542-0650p20cKrp3542-0650p20cKr5542-1050p20cKrp5542-1050p20c

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