Ktech KE-5K5L1EF User Manual
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Ktech KE-5K5L1EF User Manual

Solar storage inverter
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Solar Storage Inverter
User Manual
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KE-5K5L1EF
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Summary of Contents for Ktech KE-5K5L1EF

  • Page 1 Solar Storage Inverter User Manual Product Model KE-5K5L1EF...
  • Page 2 Important Safety Instruction Please keep this manual for future use. This manual contains all safety, installation and operating instructions for KE-5K5L1EF solar storage inverter. Please read all instructions and precautions in the manual carefully before installation and use.  Non-safety voltage exists inside the solar storage inverter. To avoid personal injury, users shall not disassemble the solar storage inverter themselves.

  • Page 3: Table Of Contents

    Contents 1. Basic Information ..............................4 1.1 Product overview and characteristics .......................... 4 1.2 Basic system introduction ...............................5 1.3 Appearance ..................................6 1.4 Dimension drawing ................................7 2. Installation Instruction ............................. 8 2.1 Installation Precautions ..............................8 2.2 Wiring specifications and circuit breaker selection ....................9 2.3 Installation and Wiring ..............................

  • Page 4: Basic Information

    1. Basic Information 1.1 Product overview and characteristics KE-5K5L1EF is a new solar storage inverter, which integrates solar energy storage & mains charging energy storage and AC sine wave output. Thanks to DSP control and advanced control algorithm, it has high response speed, high reliability and high industrial standard.

  • Page 5: Basic System Introduction

    1.2 Basic system introduction The figure below shows the system application scenario of this product. A complete system includes the following parts: 1. PV module: convert the light energy into direct current energy and then charge the battery via the machine, or directly invert the light energy into alternating current to supply power to the load.

  • Page 6: Appearance

    1.3 Appearance ① ⑪ Overload protector Dry contact port ② ⑫ ON/OFF rocker switch Cooling fan ③ ⑬ AC input terminal Battery terminal ④ ⑭ AC output terminal Cooling fan ⑤ ⑮ Grounding screw hold PV terminal ⑥ ⑯ RS485 communication port Touchable buttons Equalisation port (parallel ⑦...

  • Page 7: Dimension Drawing

    1.4 Dimension drawing...

  • Page 8: Installation Instruction

    2. Installation Instruction 2.1 Installation Precautions Before installation, please carefully read the manual and get familiar with the installation steps.  Be very careful when installing the battery. Wear safety goggles when installing a lead-acid liquid battery. Once coming into contact with the battery acid, rinse with clean water timely. ...

  • Page 9: Wiring Specifications And Circuit Breaker Selection

    Maximum PV input Recommended air switch Type diameter current or circuit breaker type KE-5K5L1EF /10AWG 2P—25A Note: the voltage in parallel shall not exceed maximum PV open-circuit voltage. Refer to the table below for recommended AC input wire diameter and switch: ...

  • Page 10: Installation And Wiring

    2.3 Installation and Wiring Installation step: Step 1: confirm the installation position and heat dissipation space, confirm the installation position of machine, such as wall surface; to install the machine, guarantee there is sufficient air flowing through the cooling fins of machine.
  • Page 11 Step 2: Remove the terminal protection cover Step 3: Wiring...
  • Page 12 AC input/output wiring method: Before AC input/output wiring, disconnect the external breaker at first and then confirm whether the cable used is thick enough. Please refer to chapter“ 2.2 Wiring Specification and Breaker type”; Correctly connect AC input wire in accordance with cable sequence and terminal position shown in the figure below.
  • Page 13 PV input wiring method: ① Prior to wiring, disconnect the external circuit breaker and confirm that the wire used is thick enough. Please refer to Section 2.2“Wiring Specifications and Circuit Breaker Selection”; ② Properly connect the PV input wire according to the wire sequence and terminal position shown in the figure below.
  • Page 14 Warning notice: Input from mains supply, AC output and PV array may generate high voltage. Before wiring, make sure to break the breaker or fuse; During wiring process, make sure to pay attention to the safety; during the wiring process, please don’t close the breaker or fuse.

  • Page 15: Parallel Machine Wire Connection

    2.4 Parallel machine wire connection 2.4.1 Introduction Up to six units connected in parallel. When using the parallel operation function, the following connecting lines (package accessories) shall be firmly and reliably connected: Parallel communication line*1: Current sharing detection line*1: 2.4.2 Precautions for connecting the parallel connecting lines Warning: Battery wiring: Parallel connection in single or three phase: Ensure that all solar storage inverters are connected to...

  • Page 16: Schematic Diagram Of Parallel Connection In Single Phase

    lines of different phases cannot be joined together. Other connection precautions are the same as parallel connection in single phase. For specific wiring, please refer to 2.4.4 Wiring Diagram. Wiring of parallel communication line: Parallel connection in single or three phase: Our company's parallel communication line is a DB15 standard computer cable with shielding function.
  • Page 17 In case of parallel operation with multiple inverters, the schematic diagram of parallel connection is as follows: a） Two units connected in parallel: b） Three units connected in parallel:...
  • Page 18 c） Four units connected in parallel: d） Five units connected in parallel:...

  • Page 19: Schematic Diagram Of Parallel Connection In Three Phase

    e） Six units connected in parallel: 2.4.4 Schematic diagram of parallel connection in three phase The parallel communication line and current sharing detection line of the solar storage inverter need to be locked with screws after connecting. The schematic diagram is as follows:...
  • Page 20 In case of parallel operation with multiple inverters, the schematic diagram of parallel connection is as follows: Parallel Operation in three phase : a） Three units connected in three phase: 1+1+1 system: b） Four units connected in three phase: 2+1+1 system:...
  • Page 21 c） Five units connected in three phase: 3+1+1 system: 2+2+1 system:...
  • Page 22 d） Six units connected in three phase: 2+2+2 system: 3+2+1 system:...
  • Page 23 4+1+1 system: Note: 1) Before starting up and running, please check whether the connection was correct to avoid any abnormalities in the system. 2) All wiring must be fixed and reliable to avoid wire drop during use. 3) When the AC output is wired to the load, it shall be properly wired according to the requirements of the electrical load equipment to avoid damage to the load equipment.

  • Page 24: Operating Mode

    3. Operating Mode 3.1 Charge mode 1) PV priority: PV module will charge the battery preferentially, and the battery is charged by the Mains only when the PV system fails. During the day, solar energy is fully used to charge, while at night, it converts to the Mains. This can maintain battery level, and is ideal for areas where the grid is relatively stable and electricity price is relatively high.

  • Page 25: Output Mode

    3.2 Output mode PV priority mode:  Use PV and battery energy to power loads, with PV taking priority. When the PV energy is greater than the load, the excess energy charges the battery: When the PV energy is less than the load, the battery replenish the power supply. When PV is invalid, switch to mains power supply and charging.
  • Page 26 Mains priority mode:  Switch to inverter power supply only when there is no utility power, and switch to utility power charging and supply when utility power recovery. The equipment is as a backup UPS, used in areas with unstable power grid. Switching does not affect the PV charging. Inverter priority mode: ...
  • Page 27 With BMS communication: when the battery SOC is lower than the [61] setting item, switch to utility power supply and charging; when the battery SOC is higher than the [62] setting item, switch to PV, battery to power the load. This mode maximizes the use of DC energy and is used in grid stable areas.

  • Page 28: Lcd Screen Operating Instructions

    4. LCD screen operating instructions 4.1 Operation and display panel The operation and display panel is as shown below, including 1 LCD screen, 3 indicators and 4 operation buttons. 4.2 Introduction to operation keys Function Key Description Enter/exit setting menu Last option DOWN Next option...

  • Page 29: Introduction To Lcd Screen

    4.4 Introduction to LCD screen Icon Function Icon Function Indicating that AC input end Indicating that inverter circuit is in has been connected to working. power grid Indicates that the AC input Indicating that the machine is in mode in APL mode (wide mains supply bypass work mode voltage range) Indicating that PV input end...
  • Page 30 Indicating that present Indicating that buzzer is not battery type of the machine is enabled lithium battery Indicating that current Indicating alarm of machine battery type of machine is lead-acid battery Indicating that the battery is in Indicating that the machine is in charge state.
  • Page 31 Real-time data view method In LCD main screen, press keys “UP” and “DOWN” to turn page and view different realtime data of the machine. Parameters in the Parameters on the right side of the Page Parameters on the left side of the screen middle of the screen screen INPUT BATT V...

  • Page 32: Setting Parameters

    4.5 Setting parameters Key operation description: to enter setting menu and exit from setting menu, please press key“SET”. After entering the setting menu, parameter number 【 00 】 shall flash. At this time, press keys “ UP ” and “ DOWN ” to select the parameter item code to be set. Afterwards, press key“ ENT” to enter parameter editing state.
  • Page 33 Parameter [01] = SBU, the battery voltage is lower Battery to [04] 43.6V than this setting value, the output is switched from mains default inverter to mains, the setting range is 40V~52V. cannot be set more than [14] setting item. Parameter [01] = SBU, the battery voltage is higher Mains to [05] 57.6V...
  • Page 34 Lithium iron phosphate battery L14/L15/L16 corresponds to lithium iron phosphate battery 14, 15, 16 strings. 16 strings, constant-voltage [08] L14/L15/L16 charge voltage is 56.8V. 15 strings, constant-voltage charge voltage is 53.2V. 14 strings, constant-voltage charge voltage is 49.2V. Ternary lithium battery, which is adjustable. N13, [08] N13/N14 constant-voltage charge voltage is 53.2V.
  • Page 35 When the battery voltage is lower than the Battery judgement point, the output is turned off discharging [15] 40V immediately. 40V~52V setting range at 0.4V limit default step. Valid when the battery type is user-define and voltage lithium. [16] DIS default Disable equalized charging.
  • Page 36 When the automatic restart after overload is enabled, if the output is turned off upon overload, [23] ENA output is restarted by the mains after 3min delay. default The machine shall not restarted after 5 times of restarts. When automatic restart after over-temperature is disabled, if over-temperature occurs to switch off [24] DIS the output, the machine will no longer switch on the...
  • Page 37 [31] 3P1/3P2/3P3 Three-phase parallel connection setting. All machines in phase 1 must be set as “3P1”. All machines in phase 2 must be set as “3P2”. All machines in phase 3 must be set as “3P3”. When the output voltage set in the setting [38] is 230Vac (S model): At present, the voltage phase difference between (P1-P2, P1-P3, P2-P3) is 120 degrees, the line voltage between the live wire L1 in phase 1 and the live wire L2 in phase 2 is 230*1.732 = 398Vac, and similarly the line...
  • Page 38 Low-voltage When the battery low voltage disconnects the disconnect battery [35] 52V inverter output, the battery voltage needs to be voltage recovery default greater than this setting to restore the battery point inverter AC output. (fault 04) Maximum PV [36] 80A default Maximum PV charging current setting: 0~100A.
  • Page 39 This mode only takes effect when the inverter communicates successfully with the lithium battery BMS (Battery Management System), and the following options can be set: [SET] When this option is selected, the inverter charging current adopts the value set in item [07], in which case item [07] can be set to any value from 0 to the maximum charging current.
  • Page 40 Discharge stops when the capacity is less than this Stop discharging [59] 5% default setting value. (Valid when BMS communication is SOC setting normal) When the capacity is greater than this setting value, Stop charging SOC [60] 100% default charging stops. (Valid when BMS communication is setting normal) When the capacity is less than this setting value,...

  • Page 41: Battery Type Parameters

    4.6 Battery type parameters For Lead-acid Battery : Battery type Sealed lead Gel lead Flooded lead User-defined acid battery acid battery acid battery Adjustable (USE) Parameters (SLD) (GEL) (FLD) Overvoltage disconnection voltage Battery fully charged recovery point(setup √ item [37]) Equalizing charge 58.4V 59.2V...
  • Page 42 For Lithium Battery : Battery type Ternary Ternary LFP (L16) Adjustable (N13) (N14) (L15) (L14) Parameters Overvoltage disconnection voltage Battery fully charged recovery point(setup 50.4V 54.8V 53.6V 50.4V 47.6V √ item [37]) Equalizing charge √ voltage Boost charge voltage 53.2V 57.6V 56.8V 53.2V...

  • Page 43: Other Function

    5. Other Function 5.1 Dry contact function Working principle: this dry node can control the switch of diesel generator to charge the battery. ① Under normal conditions, in this terminal, NC-N point is closed and NO-N point is opened; ② when the battery voltage reaches the low-voltage disconnection voltage point, the coil of the relay is energized and NO-N point is closed and NC-N point opened.

  • Page 44: Current Sharing Detection Function (Parallel Operation Only)

    Do not connect the male connector of the inverter to its female connector. Female connector Male connector 5.5 Current sharing detection function (parallel operation only) a) This port is used for current sharing detection, through which the current sharing of the parallel modules can be detected (parallel operation only).

  • Page 45: Protection

    6. Protection 6.1 Protection function Protections Description When charging current or power of the PV array PV current/power limiting protection configured exceeds the PV rated, it will charge at the rated. At night, the battery is prevented from discharging PV night reverse-current protection through the PV module because the battery voltage is greater than the voltage of PV module.
  • Page 46 Bypass over current protection Built-in AC input overcurrent protection circuit breaker. When the discharge output current of the battery is Battery input over current protection greater than the maximum value and lasts for 1 minute, the AC input would switched to load. When the battery is reversely connected or the inverter is short-circuited, the battery input fuse in the inverter Battery input protection...

  • Page 47: Meaning Of Fault Code

    6.2 Meaning of fault code Whether it Fault code Fault name affects the Description output or not 【01】 BatVoltLow Battery undervoltage alarm Battery discharge average current overcurrent software 【02】 BatOverCurrSw protection 【03】 BatOpen Battery not-connected alarm 【04】 BatLowEod Battery undervoltage stop discharge alarm 【05】...
  • Page 48 OverTemperMpp 【19】 Buck heat sink over temperature protection 【20】 OverTemperInv Inverter heat sink over temperature protection 【21】 FanFail Fan failure 【22】 EEPROM Memory failure 【23】 ModelNumErr Model setting error 【26】 RlyShort Inverted AC Output Backfills to Bypass AC Input 【29】 BusVoltLow Internal battery boost circuit failure Battery capacity below 10% alarm (valid when BMS is...
  • Page 49 【42】 SysFwVersionDiff Inconsistent system firmware version in parallel mode 【43】 ParaLineContErr Parallel line connection error in parallel mode Serial number If the serial number is not set by omission in production, 【44】 error please contact the manufacturer to set it Error setting of 【45】...

  • Page 50: Some Fault Troubleshooting

    6.3 Some fault troubleshooting Fault code Faults Remedy Check if the battery the PV air switch has been closed; if the switch is in the "ON" state; Display No display on the screen press any button on the screen to exit the screen sleep mode.

  • Page 51: System Maintenance

    7. System Maintenance In order to maintain the best long-term performance, it is recommended to conduct following  checks twice a year. Confirm that the air flow around the machine will not be blocked. In addition, remove any dirt or debris from the radiator.

  • Page 52: Technical Parameter

    8. Technical Parameter Models KE-5K5L1EF Parallel mode Permitted parallel number 1~6 units AC mode Rated input voltage 220/230Vac (170Vac~280Vac) ±2% Input voltage range (90Vac-280Vac) ±2% Frequency 50Hz/ 60Hz (Auto detection) 47±0.3Hz ~ 55±0.3Hz (50Hz); Frequency Range 57±0.3Hz ~ 65±0.3Hz (60Hz);...
  • Page 53 Max. apparent power 5500VA Max. output current THDI ＜3% Rated voltage 230Vac Rated frequency 50Hz/60Hz AC charging Battery type Lead acid or lithium battery Maximum charge current(can be set) Charge current error ± 3Adc Charge voltage range 40 –58Vdc Short circuit protection Circuit breaker and blown fuse Circuit breaker specifications Overcharge protection...

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