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Fox ESS H3-Plus User Manual

Three phase storage inverter
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User Manual
Three Phase Storage Inverter
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Summary of Contents for Fox ESS H3-Plus

  • Page 1 User Manual Three Phase Storage Inverter In order to prevent improper operation before use, please read this manual carefully.

  • Page 2: Table Of Contents

    Content 1. Notes on This Manual .................................3 1.1 Scope of Validity ................................3 1.2 Target Group..................................3 1.3 Symbols Used..................................3 1.4 Symbols Explanation ..............................4 2. Safety Precautions ..................................5 2.1 Unpacking and Inspection ............................5 2.2 Package Safety ................................5 2.3 Electrical Connection Safety ..........................6 2.4 Operation Safety ................................
  • Page 3 6.2.1 Terminal Description ...........................32 6.2.2 Terminal Pin Description ......................... 33 6.3 Secondary Ground Connection ........................33 6.4 AC Wiring ..................................35 6.4.1 AC Wiring Requirements ..........................35 6.4.2 Wiring Steps ..............................35 6.5 DC Connection ................................37 6.5.1 PV Configuration ............................38 6.5.2 Assembling DC Connectors .........................

  • Page 4: Notes On This Manual

    1. Notes on This Manual 1.1 Scope of Validity This manual describes the assembly, installation, commissioning, maintenance and troubleshooting of the following model(s) of Fox ESS products: H3-Plus P3-Plus H3-50-Plus, P3-50-Plus, H3-60-Plus, P3-60-Plus, H3-75-Plus, P3-75-Plus, Model H3-80-Plus, P3-80-Plus, H3-100-Plus, P3-100-Plus,...

  • Page 5: Symbols Explanation

    1.4 Symbols Explanation This section explains the symbols shown on the inverter and on the type label: Symbols Explanation CE mark. The inverter complies with the requirements of the applicable CE guidelines. Beware of hot surface. The inverter can become hot during operation. Avoid contact during operation.

  • Page 6: Safety Precautions

     and components for damage, check whether the product received is consistent with the actual product ordered, if there is a problem with the above check items, please do not install and contact Fox ESS. 2.2 Package Safety Danger! Make sure the product is free of any electrical connections before ...

  • Page 7: Electrical Connection Safety

    Warning! Before installation, check the unit to ensure it is free of any transport  or handling damage, which could affect insulation integrity or safety clearances. Choose the installation location carefully and adhere to specified cooling requirements. Unauthorized removal of necessary protections, improper use, incorrect installation, and operation may lead to serious safety and shock hazards or equipment damage.

  • Page 8: Operation Safety

    positive or negative grounding. Warning! Before supplying power, connect the ground wire.  Incorrect grounding can cause personal injury, death or equipment  failure and increase electromagnetic interference. Ensure that the size of the grounding wire meets the requirements of ...

  • Page 9: Disposal Safety

    To avoid the risk of electric shock, do not perform any other  maintenance operations beyond those described in this manual. If necessary, contact Fox ESS. Otherwise loss caused is not covered by the warranty. 2.6 Disposal Safety Please scrap the product in accordance with relevant local regulations and standards to...

  • Page 10: Introduction

    3. Introduction 3.1 Product Introduction H3-50-Plus, H3-60-Plus, H3-75-Plus, H3-80-Plus, H3-100-Plus, H3-125-Plus, P3-50-Plus, P3-60-Plus, P3-75-Plus, P3-80-Plus, P3-100-Plus, P3-125-Plus are three-phase storage inverter models designed for maximum efficiency and reliability. With outstanding specifications and advanced features, The inverter convert solar energy to AC energy and store energy into battery.

  • Page 11: Control Panel

    3.3 Control Panel Name Description Please refer to the table below: “DC Indicator, AC Indicator and Alarm Indicator Status DC Indicator (Green) Description” Please refer to the table below: “DC Indicator, AC Indicator and Alarm Indicator Status AC Indicator (Green) Description”...
  • Page 12 Confirm the selection. LCD Screen Display the information of the inverter. DC Indicator, AC Indicator and Alarm Indicator Status Description Alarm DC Indicator AC Indicator Indicator Description Status Status Status The PCS (power conversion system) is running in on-grid state and exporting power to the power grid.

  • Page 13: Terminals Of Inverter

    does not distinguish between on-grid and off-grid modes under this condition. The PCS is running in backup state. In normal off-grid mode, the AC indicator remains on regardless of whether the grid is present or not. 3.4 Terminals of Inverter Item Name Description...

  • Page 14: Circuit Diagram

    Waterproof It is non-removable and is designed to make the case Vent Valve both waterproof and air-permeable. 3.5 Circuit Diagram The following figure shows the circuit. PV Input Section   Multiple PV inputs are connected through individual fuses and monitored via current sensors.

  • Page 15: Backup Options

    outages. AC Surge Protection and Output Safety   AC SPD is installed to protect the output side from surge events.  Additional AC relays manage load-side disconnection or switching when needed. 3.6 Backup Options The inverter offers two backup options: whole-home backup and partial backup. The selection of loads for each option should be determined during the system design phase.
  • Page 16 Partial Backup To configure the system in a partial backup mode, it is necessary to identify the backup loads beforehand. For this purpose, connect the backup loads to the backup panel and the non-backup loads (i.e., non-essential loads) to the main panel. In the event of a grid failure, the storage system powers only the backup loads.

  • Page 17: Afci Function

    When the photovoltaic modules or cables of the inverter are poorly connected or damaged, it may generate arcs. Arcs can potentially lead to fires. The H3-Plus and P3-Plus series inverters are equipped with AFCI detection function, which is used to detect series arc faults between the photovoltaic array and the inverter.

  • Page 18: Afci Protection Configuration

    Click “Remote Setting”. Choose “Advanced (String & PE Monitoring)” → “AFCI Alarm Clearing” → “Enable” → “OK”. Then wait for the alarm to be cleared, and restart the inverter. 3.7.3 AFCI Protection Configuration H3-Plus and P3-Plus Inverters AFCI configuration is as shown in the following table.
  • Page 19 H3-75-Plus, H3-80-Plus, H3-50-Plus, H3-60-Plus, H3-100-Plus, H3-125-Plus, Model P3-50-Plus, P3-60-Plus, P3-75-Plus, P3-80-Plus, P3-100-Plus, P3-125-Plus Classification F–I–AFPE–2–4–1 F–I–AFPE–2–8–1 Rated Channel Current 160 A 320 A Maximum Current per 40 A Input Port Rated Interruption 40 A Current Number of Monitored Channels Number of Monitored Strings per Input Port Arc Plash Detection and Protection...

  • Page 20: Technical Parameters

    4. Technical Parameters 4.1 PV Input H3-50 H3-60 H3-75 H3-80 H3-100 H3-125 -Plus, -Plus, -Plus, -Plus, -Plus, -Plus, Model P3-50 P3-60 P3-75- P3-80 P3-100 P3-125 -Plus -Plus Plus -Plus -Plus -Plus Max. DC Array Power [kW] Max. DC Input Power [kW] Max.

  • Page 21: Ac Input/Output

    4.3 AC Input/Output H3-50 H3-60 H3-75 H3-80 H3-100 H3-125 -Plus, -Plus, -Plus, -Plus, -Plus, -Plus, Model P3-50 P3-60 P3-75 P3-80 P3-100 P3-125 -Plus -Plus -Plus -Plus -Plus -Plus AC Input 220/380 V Rated Grid Voltage 230/400 V (AC Voltage Range) [V] 3W+N+PE Or 3W+PE Nominal AC Input 50/60...

  • Page 22: Eps Output

    Overcurrent Protection Power Factor 0.8 Leading to 0.8 Lagging Export Control Max. THD [%] <3 @Rated Power 4.4 EPS Output H3-50 H3-60 H3-75 H3-80 H3-100 H3-125 -Plus, -Plus, -Plus, -Plus, -Plus, -Plus, Model P3-50 P3-60 P3-75 P3-80 P3-100 P3-125 -Plus -Plus -Plus -Plus...

  • Page 23: Efficiency And Protection

    Nominal AC Voltage [V] 230/400 Max. AC Input Current [A] Rated grid Frequency [Hz] 50/60 Power Factor 0.8 Leading to 0.8 Lagging Max. THDi ＜3% DC Input Current [Ir] 0.5% On/Off Grid Switch Time ＜10 [ms] Peak Current (Off Grid) 225 A, 10 s LRA Current [A] Max.

  • Page 24: General Data

    4.7 General Data H3-50 H3-60 H3-75 H3-80 H3-100 H3-125 -Plus, -Plus, -Plus, -Plus, -Plus, -Plus, Model P3-50 P3-60 P3-75 P3-80 P3-100 P3-125 -Plus -Plus -Plus -Plus -Plus -Plus Dimension and Weight Dimensions (W × H × 730 × 1060 × 305 D) [mm] Weight [kg] Cooling...

  • Page 25: Installation

    5. Installation 5.1 Installation Safety Danger! Make sure there is no electrical connection before installation. Warning! Please install the product in a well-ventilated environment.  Ensure that the heat dissipation system or vent is not blocked.  Do not install the product in a flammable or explosive or fuming ...
  • Page 26 Object Quantity Description Object Quantity Description Inverter Left Hanging Plate Hanging Plate Right Hanging Plate Connection Bar Screw-in Type M10 × 45 Bolt Assembly Handle M10 Hexagon Nut M4 × 10 Screw M6 × 65 Bolt DC Connector (Positive 8/16 Assembly ×...

  • Page 27: Mounting

    Antenna Note: H3-50-Plus, H3-60-Plus, P3-50-Plus, P3-60-Plus inverters are provided with DC Connector (Positive × 8, Negative × 8) and DC Pin Plug (Positive × 8, Negative × 8). H3-75-Plus, H3-80-Plus, H3-100-Plus, H3-125-Plus, P3-75-Plus, P3-80-Plus, P3-100-Plus, P3-125-Plus inverters are provided with DC Connector (Positive × 16, Negative × 16) and DC Pin Plug (Positive ×...

  • Page 28: Space Requirement

    5.4.2 Space Requirement Make sure there is enough space around the inverter for ventilation. 5.4.3 Angle Requirement Install the inverter vertically or at the maximum allowable rear tilt angle. Do not install the inverter horizontally forward, excessively backward, sideways, or upside down. Inverters in floating plants cannot be installed at a back tilt.
  • Page 29 Step 1: Hanging Plate Assembly Install the Inverter on a bracket or wall by means of the hanging plate. The hanging plate assembly diagram and the size of the assembled hanging plate are shown as below: Hanging Plate Assembly Diagram The Size of Hanging Plate Step 2: Bracket-mounted or Wall-mounted Installation Method 1: Bracket-mounted Installation...
  • Page 30 2. Drill holes with a hammer drill (with a φ12 drill bit), clear holes, insert 4 PCS of expansion bolts (by client, M10 × 95 is recommended) into holes, and fix them with a rubber hammer. 3. Fix the hanging plate with expansion bolts. A 4 PCS of M10 hexagon nuts B 4 PCS of expansion bolts (M10) C Wall...
  • Page 31 3. Secure the inverter with bolts. 2 PCS of M6 × 65 bolts...

  • Page 32: Electrical Connection

    6. Electrical Connection 6.1 Safety Precautions Danger! Must ensure that cables are voltage-free with a measuring instrument  before proceeding electrical connection. Before electrical connections, please make sure that the inverter switch  and all switches connected to the inverter are set to "OFF", otherwise electric shock may occur! Do not close the AC circuit breaker until the electrical connection is ...

  • Page 33: Communication Terminal

    6.2 Communication Terminal 6.2.1 Terminal Description Object Label Description Logic Terminal for AS/NZS 4777.2:2020. CAN1 Reserved CAN2 EV Communication Terminal Parallel1 Parallel Communication Terminal Parallel2 EMS Communication Terminal RS485-1 Reserved RS485 Communication Terminal RS485-2 Meter For energy meter communication.

  • Page 34: Terminal Pin Description

    BMS1 BMS2 BMS Terminal for Battery Communication BMS3 Local Area Network Terminal 6.2.2 Terminal Pin Description Cable Pin Meter Meter ISO_ Meter Meter ISO_ Meter 485A 485B 485A 485B ISO_ ISO_ GEN/0 LOAD/0 EMS- EMS- ISO_ EMS- EMS- ISO_ 485A 485B 485A 485B...
  • Page 35 The external protective grounding point provides a reliable ground  connection. Do not use an improper grounding conductor for grounding, Otherwise, it may cause product damage or personal injury. If the cross-sectional area of the grounding cable is not less than 10 ...

  • Page 36: Ac Wiring

    6.4 AC Wiring 6.4.1 AC Wiring Requirements Note! Only with the permission of the local grid department, the inverter can be connected to the grid. AC Circuit Breaker A separate three-pole or four-pole circuit breaker should be installed on the external AC side of each inverter to ensure safe disconnection from the grid.
  • Page 37 Internal Hexagon Wrench 2. Pass the independent grounding wire through the cable gland COM8, insert it into the grounding connector, and tighten it with a 5 mm internal hexagon wrench. 3. Fix the cable gland plate and connection box with M5 × 16 screws. Strip the cable insulation layer, then cut the cable gland plate passthrough hole according to the cable size and pass the cable through the cable gland plate.

  • Page 38: Dc Connection

    Note! Note the positions of the PE and N wires. Connecting a phase wire to the PE or N terminal may cause irreparable damage to the inverter. 6.5 DC Connection This series inverters can be connected with at most 20 strings of PV modules depending on the inverter type.

  • Page 39: Pv Configuration

    Do not connect one PV string to multiple inverters. Otherwise, the  inverters may be damaged. Note! PV modules - please ensure they are the same type, have the same  output and specifications, are aligned identically, and are tilted to the same angle.

  • Page 40: Assembling Dc Connectors

    6.5.2 Assembling DC Connectors 1. Rotate the DC switch to “OFF” position. 2. Check the cable connection of the PV string for polarity correctness and ensure that the open circuit voltage in any case does not exceed the inverter input limit of 1000 V. 3.

  • Page 41: Dc Wiring

    Note! The multimeter must have a DC voltage range of at least 1100 V. If the voltage is a negative value, the DC input polarity is incorrect. Please correct the DC input polarity. If the voltage is greater than 1100 V, too many PV modules are configured to the same string.

  • Page 42: Battery Connection

    7. Route the crimped cable through the nut into the plug. When you hear a “click”, the pin plug is properly clamped in the plug. 8. Unlock the DC connector. - Use the specified wrench tool. - When separating the DC+ connector, push the tool down from the top. - When separating the DC- connector, push the tool up from the bottom.
  • Page 43 Method 1：Parallel Mode Multiple battery modules (BAT1, BAT2, BAT3) are connected in parallel for power, while only one BMS communication line (BMS1) from the master battery is connected to the inverter. Note! Ensure that one battery is designated as the master BMS. Other batteries must follow its configuration and must not connect their BMS ports to the inverter directly.

  • Page 44: Antenna Connection

    Note! The inverter can be connected to 1, 2, or 3 battery modules. The diagram above illustrates the wiring example for connecting 3 battery modules. 6.5.5 Antenna Connection Remove the antenna sealing cap, and screw the antenna into the WiFi antenna port on the inverter.

  • Page 45: Communication Device Installation

    6.6 Communication Device Installation The inverter offers various communication options, such as WiFi, LAN, RS485, and connection to a smart meter. Operational data such as voltage, current, and other parameters can be monitored locally or remotely. 6.6.1 Monitoring Module 6.6.1.1 Download FoxCloud APP 2.0 Please download the FoxCloud APP 2.0 from Apple store or Google store.
  • Page 46 3. San the SN QR code on the inverter’s label or enter the SN code manually. 4. Connect the device with built-in WiFi module. The SSID of the built-in WiFi module is “W-XXXXXXX”, and the default password is “mtmt2020”. Method 2: Web Configuration: 1.
  • Page 47 Note! The default password is "mtmt2020". After logging in, please change the password and log in again using the new one. 4. Click “WiFi Configuration”, and scroll down the WiFi Setting SSID menu to find house router and input the house router’s password. Click “Submit”. Note! Please go to FoxCloud APP 2.0 to create account and plant.
  • Page 48 - Step 2: Login. - Step 3: Create a plant. - Step 4: Click the “+” button after “Add Device” in the first row to add a device. - Step 5: Scan the QR code or enter SN code to add device. Then your device will be listed below.
  • Page 49 - Step 6: Please fill in the remaining information. And click “Save”. - Step 7: After the plant is created, please note that it may need to wait for 3–5 minutes to upload inverters data.

  • Page 50: Meter Connection

    6.6.2 Meter Connection Communication Connection：   Connect the meter to the inverter using an RJ45 communication cable.  Ensure the communication cable follows the specified pin out sequence to guarantee reliable data transmission.  The communication interface on the inverter is located at the bottom terminal block area.
  • Page 51  Proper grounding ensures system safety and compliance with electrical standards. Wiring Precautions：   Confirm all wiring connections are tight and well-insulated before powering on the system.  Double-check phase alignment (L1, L2, L3) between the meter, inverter, and the utility grid.

  • Page 52: Main Function Implementation

    7. Main Function Implementation 7.1 Reactive Function Setting Step1: Login Fox Cloud Step2: Enter SN of Inverter Step3: Click the icon “ ” on the left side.

  • Page 53: Diesel Generator

    Step4: Click “PowerFactor” in the menu, and ensure “PowerFactorEnable(WInj)Enable” and “SetReactivePowerEnable”are enabled. Step5: Configure the “LimitMaxPowerValue”as needed. The default value is 110, and the allowable range is from 0 to 200. Step 6: Configure the “ReactivePowerValue(Vars)” as needed. The default value is 0.0, and the allowable range is from -120 to 120.
  • Page 54 Generator Start Signal Interface:   The Inverter provides a dry contact output interface located on the internal terminal block (e.g., port CN4, pin 1 and pin 2).  When conditions for generator startup are met, the inverter closes this contact to trigger the generator start command.

  • Page 55: Commissioning

    8. Commissioning 8.1 Inspection before Commissioning Check the following items before starting the inverter: All equipment has been reliably installed.  DC switch(es) and AC circuit breaker are in the "OFF" position.  The ground cable is properly and reliably connected. ...

  • Page 56: Maintenance

    9. Maintenance This section contains information and procedures for solving possible problems with the Fox ESS inverters and provides you with troubleshooting tips to identify and solve most problems that can occur. 9.1 Maintenance Safety Danger! When maintaining the product, it is strictly prohibited to open the ...

  • Page 57: Alarm List

    9.2 Alarm List Fault Item Statement Solution Code 1. The inverter continuously monitors its external working conditions in real time, and it can automatically recover once the fault is rectified. 1030 AC Overcurrent 2. If the fault is triggered frequently and affects the power production of the PV plant, check for any short circuits in the grid or the output.
  • Page 58 Fault Item Statement Solution Code may be due to temporary abnormalities in the power grid. The inverter will automatically recover after the power grid has resumed normal operation. 2. If the fault is triggered frequently, check whether 1043 Grid Frequency Low the grid frequency is within the acceptable range.
  • Page 59 Fault Item Statement Solution Code limit. If it is outside the standard range, contact the local power operator for grid adjustment measures. 3.If the grid-connected line voltage has been confirmed to exceed the limit and approval has been obtained from the local power operator, you may manually adjust the over/undervoltage protection threshold parameters to adapt to...
  • Page 60 Fault Item Statement Solution Code working conditions in real time. And it will automatically recover once the fault is rectified. 3. If the fault is triggered frequently and affects the power production of the PV plant, check whether the grid or the output is overloaded or short-circuited.
  • Page 61 Fault Item Statement Solution Code input switch, and battery switch in order, and then turn on the battery switch, AC output switch, and DC input switch in sequence after 5 minutes. 4. If the fault still exists, contact your installer. 1.
  • Page 62 Fault Item Statement Solution Code 3. Check whether the Emergency Stop Switch cable is connected to the correct connector of the device. 4. Check whether the jumper in the inverter or the FOX Hub is connected well. 5. If the fault still exists, contact your installer.
  • Page 63 Fault Item Statement Solution Code installer. 1. If the fault is triggered accidentally, it may be due to temporary abnormalities in the power grid. The inverter will automatically recover after the power grid has resumed Abnormal Frequency normal operation. 1108 Detection Value 2.
  • Page 64 Fault Item Statement Solution Code Customer Service Center. 1. Check whether the AC grid cables especially the neutral cables are connected correctly. 1123 Grid Relay Fault 2. Check whether the configuration of "Country" is correct. 3. If the fault still exists, contact your installer.
  • Page 65 Fault Item Statement Solution Code 2. Check the SOC of the battery and verify if the power of the loads exceeds the battery's power. 3. If the fault still exists, contact your installer. 1. Check if the power of the loads exceeds the rated value.
  • Page 66 Fault Item Statement Solution Code 3. If the fault still exists, contact your installer. 1. Check whether the AC grid cables especially the neutral cable are connected correctly. 2. Check whether the configuration of "Country" is correct. 3. Turn off the AC output switch, DC 1157 Relay Permanent Fault input switch, and battery switch in...
  • Page 67 Fault Item Statement Solution Code 1. Turn off the DC input switch, and battery switch in order, and then turn BST Hardware Overcurrent on the battery switch and DC input 1176 Permanent Fault switch in sequence after 2 minutes. 2. If the fault still exists, contact your installer.
  • Page 68 Fault Item Statement Solution Code input switch, and battery switch in order, and then turn on the battery switch, AC output switch, and DC input switch in sequence after 2 minutes. 4. If the fault still exists, contact your installer. 1.
  • Page 69 Fault Item Statement Solution Code input switch, and battery switch in order, and then turn on the battery switch, AC output switch, and DC input switch in sequence after 2 minutes. 2. If the alarm still exists, contact your installer. 1.
  • Page 70 Fault Item Statement Solution Code restart the battery. 3. Turn off the AC output switch, DC input switch, and battery switch in order, and then turn on the battery switch, AC output switch, and DC input switch in sequence after 2 minutes. 4.
  • Page 71 Fault Item Statement Solution Code Channel Fault communications cable and power cable between the inverter and the battery are properly connected. 2. Turn off the AC output switch, DC input switch, and battery switch in order, and then turn on the battery switch, AC output switch, and DC input switch in sequence after 2 minutes.
  • Page 72 Fault Item Statement Solution Code switch in sequence after 2 minutes. 3. If the fault still exists, contact your installer. 1. Shut down the battery and check the communications cable and power cable between the inverter and the battery are properly connected. 2.
  • Page 73 Fault Item Statement Solution Code installer. 1. Check the ventilation and ambient temperature at the battery installation position. 2. If the ventilation is poor or the Cell Overtemperature ambient temperature exceeds the 1255 Protection upper threshold, improve the ventilation and heat dissipation. 3.
  • Page 74 Fault Item Statement Solution Code 1. Restart the battery. 1264 Relay Fault 2. If the fault still exists, contact your installer. Communication Fault 1. Turn off the AC output switch, DC 1281 between Communication input switch, and battery switch in Board and Main DSP order, and then turn on the battery switch, AC output switch, and DC input...
  • Page 75 Fault Item Statement Solution Code with drain wire. 3. Turn off the AC output switch, DC input switch, and battery switch in order, and then turn on the battery switch, AC output switch, and DC input switch in sequence after 2 minutes. 4.
  • Page 76 Fault Item Statement Solution Code order, and then turn on the battery 1317 Mppt5 High Voltage Fault switch, AC output switch, and DC input switch in sequence after 5 minutes. 1318 Mppt6 High Voltage Fault 6. If the fault still exists, contact your 1319 Mppt7 High Voltage Fault installer.
  • Page 77 Fault Item Statement Solution Code switch, AC output switch, and DC input 1348 String4 Access Fault switch in sequence after 5 minutes. 3. If the fault still exists, contact your 1349 String5 Access Fault installer. 1350 String6 Access Fault 1351 String7 Access Fault 1352 String8 Access Fault...
  • Page 78 Fault Item Statement Solution Code inverter will automatically recover once the power grid has resumed normal operation. 2. Check whether the on-grid voltage exceeds the upper threshold. If it is, contact the local power operator. 3. If you have confirmed that the grid connection voltage exceeds the upper threshold and have obtained the consent from the local power...
  • Page 79 Fault Item Statement Solution Code acceptable range, modify the grid overfrequency protection threshold with the consent from the local power operator. 1. If the fault is triggered accidentally, it may be due to temporary abnormalities in the power grid. The inverter will automatically recover once the power grid has resumed normal operation.
  • Page 80 Fault Item Statement Solution Code installer. 1. If the fault is triggered accidentally, it may be due to temporary abnormalities in the Generator. The inverter will automatically recover after the power Generator has HUB Generator Voltage resumed normal operation. 1415 Overfrequency 2.
  • Page 81 Fault Item Statement Solution Code automatically recover once the interference disappears. 2. Turn off the AC output switch, DC input switch, and battery switch in order, and then turn on the battery switch, AC output switch, and DC input switch in sequence after 2 minutes. 3.
  • Page 82 Fault Item Statement Solution Code 2. If the fault still exists, contact your installer. 1. Turn off the AC output switch, DC input switch, and battery switch in order, turn on and then turn off the Manual switch on the Grid Relay. Then HUB Grid Relay Open 1422 turn on the battery switch, AC output...
  • Page 83 Fault Item Statement Solution Code communication cable exceeds the upper threshold in the specification ， and whether it is shielded twisted pair with drain wire. 4. If steps 1 and 2 are both checked,turn off the AC output switch, DC input switch, and battery switch in order, and then turn on the battery switch, AC output switch, and DC input switch in sequence after 2 minutes.
  • Page 84 Fault Item Statement Solution Code checked,turn off the AC output switch, DC input switch, and battery switch in order, and then turn on the battery switch, AC output switch, and DC input switch in sequence after 2 minutes. If the fault still exists, contact your installer.
  • Page 85 Fault Item Statement Solution Code BDC1 Pre-charging 1.Turn off the AC output switch, DC 1444 Resistor Fault input switch, and battery switch in order, and then turn on the battery BDC2 Pre-charging 1445 switch, AC output switch, and DC input Resistor Fault switch in sequence after 2 minutes.
  • Page 86 Fault Item Statement Solution Code connected. 2. Turn off the AC output switch, DC input switch, and battery switch in order, and then turn on the battery 1461 Battery3 Input Fault switch, AC output switch, and DC input switch in sequence after 2 minutes. 3.
  • Page 87 Fault Item Statement Solution Code upper threshold, improve the ventilation and heat dissipation. 3. If the ventilation and ambient temperature both meet requirements, contact your installer. 1. Check whether the ambient temperature at the battery installation position is higher than the lower Cell Undertemperature threshold.
  • Page 88 Fault Item Statement Solution Code installer. Internal Communication 1506 Error 1507 Overvoltage Protection 1. Restart the battery. 1508 Undervoltage Protection 2. If the fault still exists, contact your installer. Charging Overcurrent 1509 Protection Discharging Overcurrent 1510 Protection 1. Check the ventilation and ambient temperature at the battery installation position.

  • Page 89: Troubleshooting

    Are the display panel and the communications cable properly connected and  undamaged? Contact Fox ESS Customer Service for further assistance. Please be prepared to describe details of your system installation and provide the model and serial number of the unit. 9.4 Routine Maintenance A.
  • Page 90 Connection Check whether cable year damaged, especially whether the part of the cable in contact with the metal shell is cut. Note: Only qualified individuals may perform these actions. C. Fan Maintenance The inverter's built-in fan cools and dissipates heat during its operation. If the fan does not work properly, the inverter cannot be effectively cooled, which will affect the efficiency of the inverter or cause derating operation.

  • Page 91: Decommissioning

    10. Decommissioning 10.1 Dismantling the Inverter Disconnect the inverter from DC Input and AC output. Wait for at least 15 minutes for  the inverter to fully de-energize. Disconnect communication and optional connection wirings. Remove the inverter  from the bracket. Remove the bracket if necessary.
  • Page 92 The copyright of this manual belongs to FOXESS CO., LTD. Any corporation or individual should not plagiarize, partially or fully copy (including software, etc.), and no reproduction or distribution of it in any form or by any means is permitted. All rights reserved.

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