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EG4 FLEX BOSS18 User Manual

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E G 4
F L E X B O S S 1 8
®
H Y B R I D I N V E R T E R
U S E R M A N U A L
©2025 EG4
®
ELECTRONICS, LLC. ALL RIGHTS RESERVED.
VERSION 1.0 | INFORMATION SUBJECT TO CHANGE WITHOUT NOTICE.
MODEL #: IV-13000-HYB-AW-FX-XX (XX is a number between 00-99)

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  • Page 1 ® H Y B R I D I N V E R T E R U S E R M A N U A L ©2025 EG4 ® ELECTRONICS, LLC. ALL RIGHTS RESERVED. VERSION 1.0 | INFORMATION SUBJECT TO CHANGE WITHOUT NOTICE.

  • Page 2: Table Of Contents

    NEW USER ACCOUNT ................................... 34 EXISTING USER ACCOUNT ................................35 ENABLE APP NOTIFICATIONS ..............................36 LOCAL MONITORING SETUP WITH THE EG4® MONITORING APP ..................38 MONITORING CENTER OVERVIEW ................................ 39 WORKING MODES AND WEATHER OPTIMIZATION SETTINGS ................... 39 COMMON SETTINGS ..................................45 APPLICATION SETTINGS ................................

  • Page 3: Technical Specifications

    1. TECHNICAL SPECIFICATIONS INVERTER TYPE & MODEL # IV-13000-HYB-AW-FX-XX (XX is a number between 00-99) HYBRID AC INPUT/OUTPUT NOMINAL GRID VOLTAGE (INPUT & OUTPUT) 240 VAC | 208 VAC FREQUENCY 60Hz Default (50Hz Capable) 10kW MAX. CONTINUOUS DISCHARGE RATE 13kW (54A @240V) MAX.
  • Page 4 FCC Part 15 Class B EMISSIONS RSD NEC 2020:690.12 AFCI NEC 2020:690.11/UL1699B SAFETY GFCI NEC 2020:690.41 (B) *For information regarding warranty registration on EG4 ® Electronics products, please navigate to https://eg4electronics.com/warranty/ and select the corresponding product to begin the registration process.

  • Page 5: Abbreviations

    2. ABBREVIATIONS In-lbs. – Inch Pounds • • AWG – American Wire Gauge kW – Kilowatt • A – Amps • kWh – Kilowatt-hour • Ah – Amp hour(s) • LCD – Liquid Crystal Display • AC – Alternating Current •...

  • Page 6: Safety

    3. SAFETY 3.1 SAFETY INSTRUCTIONS International safety regulations have been strictly observed in the design and testing of the inverter. Before beginning any work, carefully read all safety instructions, and always observe them when working on or with the inverter. The installation must follow all applicable national or local standards and regulations.
  • Page 7 Cancer and Reproductive Harm – See www.P65Warnings.ca.gov for more details. DISCLAIMER EG4 reserves the right to make changes to the material herein at any time without notice. Please refer to www.eg4electronics.com for the most updated version of our manuals/spec sheets.

  • Page 8: Product Overview

    The FlexBOSS18 is a more affordable entry level cousin to the FlexBOSS21. Though it can perform as a standalone inverter, it has been designed to work optimally with EG4’s GridBOSS power gateway. This unique pairing unlocks an even more robust feature-set and level of performance for the end user.

  • Page 9: Features

    Supports up to 10 inverters in a parallel configuration. • Users can monitor system performance and perform updates remotely via the EG4 Monitoring website and mobile app, ensuring control and flexibility. Full AC coupling, generator, and smart loads capabilities when used with GridBOSS.

  • Page 10: Operation Overview

    4.3 OPERATION OVERVIEW CALLOUT COMPONENT DESCRIPTION Handles Use for installation. LED Panel Used to monitor system status. PV Disconnect Used to connect and disconnect power from solar panels. Switch Clasps Use to open cable box. Wi-Fi Dongle Used to communicate with Monitor Center app or website. RSD Button Rapid Shut Down.
  • Page 11 CABLE BOX OVERVIEW CALLOUT COMPONENT DESCRIPTION Provides support and connections for inverter paralleling, Communication Board CTs, battery communications, and external RSD. Battery (DC) Connections Used to connect battery cables. Integrated Bonded Battery Breaker Overcurrent protection for connected batteries. AC Connections Used for wiring AC power from the grid and to the loads.
  • Page 12 COMMUNICATION BOARD OVERVIEW CALLOUT DESCRIPTION Reserved Reserved Parallel DIP Switches: Set DIP switches when using inverter in parallel. Battery Communication Port (CAN & RS485) Fan Power Supply Reserved Reserved CT Interface Ports Reserved Reserved Paralleling Communication Ports DRY (NO, NC) Reserved RSD Terminals NTC: Connection for temperature sensor for lead acid battery.

  • Page 13: Dimensions

    4.4 DIMENSIONS...
  • Page 14 BOTTOM VIEW OF CABLE BOX KNOCKOUTS U.S. NOM. TRADE SIZE ACTUAL KNOCKOUT SIZE 3/4 in. 28.5 mm. (1.12 in.) 1 1/2 in. 50.5 mm. (1.99 in.) 2 in. 63 mm. (2.48 in.) BACK VIEW OF CABLE BOX KNOCKOUTS...

  • Page 15: Storing The Inverter

    4.5 STORING THE INVERTER If placing the inverter into storage before installation, keep the following factors in mind while selecting a storage location: CAUTION: • The inverter and its components must be stored in its original packaging. • The storage temperature should be within -13 – 140°F (-25 – 60°C) with humidity between 0 –...

  • Page 16: General Installation

    5. GENERAL INSTALLATION This section provides detailed steps for installing and configuring the inverter. It is recommended to complete each section in order as listed below. INSTALLATION STEPS 5.1 Recommended Tools 5.2 Location Requirements 5.3 Mounting the Inverter 5.4 Cable Installation 5.5 Initial Startup and Configuration 5.1 RECOMMENDED TOOLS Safety Goggles...

  • Page 17: Location Requirements

    5.2 LOCATION REQUIREMENTS The mounting wall should be strong enough to bear the weight (114 lbs. (52 kg)) of the • inverter. 5.91 in. 5.91 in. (150 mm) (150 mm) Maintain the minimum clearances presented above for adequate heat dissipation. •...

  • Page 18: Mounting The Inverter

    5.3 MOUNTING THE INVERTER The inverter is designed to be wall-mounted on a solid, vertical, non-combustible surface such as brick or concrete. Two or more people may be needed to install the inverter due to its weight, using the team-lift technique. The slots on the mounting bracket can accommodate various stud spacings from 12 in.

  • Page 19: Mounting Steps

    MOUNTING STEPS 1. Select a location for the inverter’s final placement as described in section 5.2. 2. Use the wall mounting template and a marker to mark where the mounting bracket screws will be installed. Use a level to ensure the bracket will be installed parallel with the ground.
  • Page 20 5. Using the team-lift technique, place the inverter onto the wall bracket, securing it to the wall. 6. Temporarily mount the L bracket to the side of the inverter (located at the bottom, one on each side). Mark holes on the wall based on the hole location on the L bracket (repeat this step for both sides).

  • Page 21: Cable Installation

    5.4 CABLE INSTALLATION To expose the cable box area, open the bottom cover by releasing the clasps on the side of the inverter and removing the three screws on the internal wire box cover as indicated in the image below. Before connecting any wiring to the inverter, verify each wire is not carrying voltage using a multimeter.

  • Page 22: Battery Connections

    BATTERY CONNECTIONS The EG4 FlexBOSS18 comes equipped with two battery inputs with two positive and two negative ® points of connection. The two positive battery terminals are protected by a 250A breaker. This is to accommodate using parallel conductors as supplied with the WallMount battery series. It is designed to utilize four battery cables by using two sets of cables rather than resorting to larger cable sizes.
  • Page 23 Select “Maintenance,” “Remote Set,” and choose the correct battery type under “Common Settings.” For closed-loop communication between the inverter and lithium batteries, choose “Lithium” • as the battery type. For inter-battery communication and battery setup with EG4 batteries, ® refer to the respective battery manual.
  • Page 24 FOR LITHIUM BATTERIES: • ® strongly recommends using closed-loop communications between the battery bank and inverter. Ensure the lithium battery being used is compatible with the inverter by visiting www.eg4electronics.com for an updated list of third-party batteries capable of closed-loop communication.
  • Page 25 PV CONNECTIONS When sizing AC wires, adhere to the following information*: CABLE SIZE MIN. INSULATOR VOLTAGE MAX. AMPERAGE PER MPPT MPPT 1: 26A 10 AWG – 6 AWG (max.) 600V (6 mm – 16 mm MPPT 2: 26A *Consult a licensed electrician or National Electric Code (NEC) to ensure that appropriate cable size is used due to various factors such as distance, operating voltage, and amperage.
  • Page 26 6. Ensure the conduit and conduit fittings are fastened securely and the cable entry holes are sealed. NOTE: Use wire ferrules for the PV string conductors if using fine stranded wire. NOTE: Navigate to the ® Solar Panel String Sizer tool for additional assistance: https://eg4electronics.com/wp-content/themes/hello-elementor/eg4-solar-panel- string-sizer.
  • Page 27 STRING USAGE & SIZING String 1 MPPT #1 String 2 String 3 MPPT #2 String 4 The image shown above represents full utilization of the 2 MPPTs. It is for representative purposes only. The maximum utilized solar input of the inverter is 18kW (DC). •...
  • Page 28 AC CONNECTIONS When sizing AC wires, adhere to the following information*: CONNECTION MAX. BREAKER SIZE MAX. CABLE SIZE MAX TORQUE VALUES Grid 2/0 AWG (70 mm 44 in-lbs. (5 Nm) Load 2/0 AWG (70 mm 44 in-lbs. (5 Nm) Ground 4 AWG (25 mm 26 in-lbs.
  • Page 29 INSTALL STEPS: The FlexBOSS18 comes equipped with L1 and L2 terminals for AC input (labeled GRID) and output (labeled LOAD). It is designed to utilize up to 90A of input and up to 90A of output (via bypass). These terminals are not connected to a breaker; it is recommended to install a separate AC breaker between inverter and AC input power source.
  • Page 30 CT CONNECTION To measure the power imported from and exported to the grid, a pair of CTs or one three-phase meter must be installed at the service entry point in or near the main service panel. Two (2) CTs are provided with each inverter with a 300A rating.

  • Page 31: Initial Startup & Configuration

    CT CLAMP RATIO: The inverter supports three ratios of CT clamps: 1000:1, 2000:1, and 3000:1. The included CTs are 3000:1. If using a 3rd party CT, ensure the CT ratio is of the supported types. Be sure to select the correct CT ratio setting on the inverter.
  • Page 32 4. Power on each battery one at a time, starting with the master, then each additional battery in ~5 second intervals. This should power up the unit. 5. Check the front LED display to confirm unit powers on. 6. Check for warnings and errors using the LED panel on the front face of the unit of the unit. If the inverter shows “normal”...

  • Page 33: Multiple Inverters

    MULTIPLE INVERTERS The EG4 FlexBOSS18 supports up to 10 units connected in parallel to reach a capacity of up to ® 130kW. To successfully connect inverters together in a parallel configuration, verify the following: A single string of solar panels cannot be shared between inverters.
  • Page 34 13. Ensure the battery communications cable is properly connected from master battery to the master inverter. 14. Using the EG4 Monitor Center, mobile app, or LED indicators on the front of the unit, verify there are no faults or alarms.

  • Page 35: Remote Monitoring Configuration

    There are multiple ways for the inverter to be programmed and monitored. The most common and convenient are the EG4 Monitor Center Website (monitor.eg4electronics.com) and the EG4 Monitor ® App. The following sections discuss the various ways to communicate with the inverter.

  • Page 36: New User Account

    (SN) and dongle PIN can be found on the sticker attached to the side of the dongle. 3. Once the registration is complete, return to the EG4 Monitor Center web page and login using the username and password created during the registration process.

  • Page 37: Existing User Account

    6.3 EXISTING USER ACCOUNT When an EG4 ® account already exists, new EG4 hardware that utilizes a dongle can be added to the existing account. This can be completed using the Monitor Center or the phone app. USING EG4 MONITOR CENTER: 1.

  • Page 38: Enable App Notifications

    6.4 ENABLE APP NOTIFICATIONS The EG4 ® Mobile App allows the end user to easily check real-time system information regarding the inverters, batteries, and other informative values. ENABLE NOTIFICATIONS IN MONITOR CENTER: 1. Go to monitor.eg4electronics.com and login. 2. At the top of the screen, select “Configuration,” then “Users.”...
  • Page 39 Mobile App allows the end-user to easily check real-time system information regarding the inverters, batteries, and other informative values. NOTE: Ensure the app is up to date before proceeding! 1. Login to the EG4 ® Monitor App. Select the user icon at the top right corner of the screen.

  • Page 40: Local Monitoring Setup With The Eg4® Monitoring App

    Toggle selection on to “Allow Notifications” on device and choose how to receive notifications 6.5 LOCAL MONITORING SETUP WITH THE EG4® MONITORING APP If there is no Wi-Fi available at the location, use the local function to monitor or set up the system: 1.

  • Page 41: Monitoring Center Overview

    7. MONITORING CENTER OVERVIEW This section will cover the different settings and modes of operation that can be configured through the Monitor Center. ® For more information, scan the following QR code: 7.1 WORKING MODES AND WEATHER OPTIMIZATION SETTINGS IMPORTANT: These settings may need to be adjusted after installation.
  • Page 42 1. To enable this feature, select “Maintenance” at the top of the Monitor Center webpage. 2. Select “Weather Optimization” to the left of the screen. 3. Select the desired inverter and click the location button. 4. Input the inverter’s information on the next screen and select update.
  • Page 43 5. Afterwards, select “Management,” then “Edit. 6. Set charging times and percentages based on electricity use patterns and weather conditions. The platform sends user settings to the inverter, and the inverter provides feedback, confirming the receipt of setting and executing charging operations according to user-defined parameters.

  • Page 44: Working Modes

    WORKING MODES Working modes are pre-set priority systems that allow users to configure the system to meet their demands through extensive customizations. These modes can be found under the Maintenance tab by clicking “Working Mode.” Scroll past “Application Setting” to the “Working Mode Setting” section. WORKING MODE DEFINITIONS: Backup Mode: Battery power used as a last resort.
  • Page 45 PEAK SHAVING Grid Peak-Shaving: Enable grid peak-shaving. Grid Peak-Shaving Power(kW)/Grid Peak-Shaving Power2(kW): Set the maximum • amount of power that will be drawn from the grid. Start Peak-Shaving Volt 1(V)/Start Peak-Shaving Volt 2(V): Set the starting point of peak- • shaving when using voltage setpoints for batteries.
  • Page 46 Start/Stop AC Charge SOC(%): Set the starting point of AC Charging when using SOC • setpoints for batteries. Start/Stop AC Charge Volt(V): Set the starting point of AC Charging when using voltage • setpoints for batteries. T1/T2/T3 Start/End: Set the start/end time of AC Charge mode depending on SOC/voltage •...

  • Page 47: Common Settings

    Export PV Only: Enable this setting to sell back generated PV power to the grid. • Forced Discharge Power(kW): Set the maximum power limit of battery discharge. • Stop Discharge SOC(%)/Volt: Stop the forced discharge upon reaching the set SOC/ •...

  • Page 48: Application Settings

    Lithium Brand: This setting allows the user to select from a list of compatible batteries for • closed-loop communications. Firmware version: The current firmware version installed on the inverter. • LCD Version: Reserved for future use. • 7.3 APPLICATION SETTINGS No Batteries: Allows access to off-grid mode when there is no battery and solar is the only •...

  • Page 49: System Grid Connect Settings

    • System Charge SOC/Volt Limit: Set charge limits based on SOC or Voltage. PARALLEL SETTINGS Set System Type: The EG4 FlexBOSS18 supports paralleling of multiple inverters; in this • ® scenario, set one of the inverters to master and the others to slave. If all inverters are installed in one phase, set one of the inverters to “1 Phase Master”.

  • Page 50: Charge Settings

    7.5 CHARGE SETTINGS Batt Charge Control (Volt/SOC): Batt Charge Control will charge the battery bank according • to Voltage/SOC depending on selection. • Charge Last: Charges battery as a last priority. Charge Current Limit (Adc): Set the maximum battery charge current. •...

  • Page 51: Discharge Settings

    Off-Grid Discharge Cut-Off SOC(%)/Volt(V): Select how low to drain battery bank before • going on-grid and allowing battery bank to charge. With EG4 batteries, do not allow this ® value to go below 20%.

  • Page 52: Reset

    • Stop Discharge SOC(%)/Volt(V): If Battery SOC/voltage is lower than this limit, the inverter will stop the forced discharging function. Note: For EG4 ® batteries, this value should be ABOVE 20% of total battery capacity. PVSellToGrid(Comp. w/NEM3.0): Enable for only PV sell back.

  • Page 53: Rapid Shutdown/Ess Disconnect

    In case of emergency, press the rapid shutdown button to cut off the power supply, cutting the inverter’s AC output along with dropping the PV conductor’s voltage to <30V in 30 seconds. NOTE: When using supported EG4 ® batteries in closed-loop communications with the inverter, the RSD also initiates ESS disconnect as required by NEC code.

  • Page 54: Working With A Gridboss

    9. WORKING WITH A GRIDBOSS While the FlexBOSS18 is a hybrid inverter that is capable of functioning on its own, pairing it with the GridBOSS allows for more flexibility and functionality. ® FUNCTION DESCRIPTION Allows the user to pair the FlexBOSS18 and Grid BOSS with existing or new AC Coupling grid-tie only inverters.

  • Page 55: Inverter Maintenance

    10. INVERTER MAINTENANCE Electrical equipment must be properly maintained to increase longevity and consistency. Follow the steps below to help prevent component damage/deterioration: 1. Inspect the inverter every month to confirm nothing covers the inverter’s vents. If it is covered, shut down the inverter and clear the vents to restore proper cooling.

  • Page 56: Firmware Updates Via The Eg4® Electronics App

    Ensure the Wi-Fi dongle is securely connected and correctly configured (see section 6.1 for details) before performing the following steps: 1. Open the EG4 Electronics app on a mobile device and select the “DOWNLOAD FIRMWARE” button. 2. Choose the correct firmware file (see eg4electronics.com for the most up-to-date files) and select “DOWNLOAD”...

  • Page 57: Inverter Troubleshooting

    11. INVERTER TROUBLESHOOTING If a warning or fault occurs, users can troubleshoot according to the LED status description and the warning/fault information found in the “Event History” tab on the app or Monitor Center website. DISPLAY DESCRIPTION ACTION Solid On Working normally.

  • Page 58: Fault Definitions & Troubleshooting

    11.1 FAULT DEFINITIONS & TROUBLESHOOTING FAULT MEANING TROUBLESHOOTING M3 microprocessor fails to M3 Rx failure Restart the inverter. If the error persists, contact receive data from DSP the distributor. Model fault Incorrect model value 1. Check if the L1, L2, and N wires are connected correctly at the inverter load Inverter detected short-circuit on EPS short circuit...

  • Page 59: Alarm Definitions & Troubleshooting

    1. If a master has been configured in the system, the fault will automatically be removed after the master works. 2. If a master has not been configured and Para master loss No master in the parallel system there are only slaves in the system, set the master first.
  • Page 60 Inverter detected high DC injection Restart the inverter. If the alarm Trip by DCI high current on grid terminal persists, contact the distributor. 1. Check whether each PV string is Inverter detected a short circuit in connected correctly. PV short circuit PV input 2.

  • Page 61: Dongle Troubleshooting

    When internal communication is successful, the INV LED is solid 4. When all three dongle LEDs are on, the inverter can be configured and monitored using the mobile app or the EG4 monitor website. ® NOTE: The dongle should automatically power-on if the inverter is on and the dongle is plugged into the dongle connector.

  • Page 62: Connectivity Requirements

    4. The configuration parameters used by the dongle when connecting and communicating over the Wi-Fi network are described below: NOTE: If the home screen is bypassed after opening the EG4 app, press the user icon in the upper right of the screen and then select logout. NOTE: After selecting Dongle Connect, give the dongle time to respond to the EG4 monitor mobile app.

  • Page 63: Troubleshooting Dongle Network Connection

    12.5 TROUBLESHOOTING DONGLE NETWORK CONNECTION ERROR: “SET FAILED” AND/OR “SET PARAMETER FAILED” Description: This error message may appear after selecting any button in the app that • performs an action. For example, selecting the “Home WIFI Connect” button as shown below.

  • Page 64: Network Security

    2. Using a supported device, connect the Wi-Fi network created by the dongle, generally it's named as dongle serial number (i.e., BEXXXXXXXX, BJXXXXXXXX, BGXXXXXXXX). 3. Open the EG4 mobile app and select “DONGLE ® CONNECT”. Then select “DONGLE CONNECT PARAMS”.
  • Page 65 5. Select the “eye” icon and enter the verification code 123123. The “OK” button may need to be selected twice, depending on communication and/or software lag. 6. The default WPA2 password set at the factory is “12345678”. To change the default password, select inside the password area and overwrite the existing password using the desired password.
  • Page 66 This is the quickest and easiest option because it does not require using the currently set WPA2 password set on the dongle’s Wi-Fi network. Option 2: Use the EG4 App to disable the security settings on the dongle. This option can •...
  • Page 67 4. Press the “eye” icon and enter the verification code 123123. 5. Select the “SET” button. There may be a short pause after selecting SET. If this step is not completed, security will NOT be disabled. Press “OK”, when prompted. The dongle will reboot, and security will be disabled after the reboot is complete.

  • Page 68: Update Dongle Firmware Using App

    ® 3. The current dongle firmware will be displayed on the Update firmware button. Select the “Vx.xx Update Firmware” button to start the upgrade process. The EG4 app will automatically locate the latest firmware version available. 4. Select “Vx.x.x UPDATE FIRMWARE” to load the new firmware to the dongle.

  • Page 69: Standards And Certifications

    13. STANDARDS AND CERTIFICATIONS The EG4 ® FlexBOSS18 is cETL listed and complies with national and international standards for safety and reliability when connected to the grid. SAFETY • ULSTD.1741,1741SA,1741SB, 1741 PCS CRD AFCI NEC 2020:690.11/UL1699B • • GFCI NEC 2020:690.41(B) CSA 22.2 #107.1:2016 Ed.

  • Page 70: Changelog

    14. CHANGELOG Ver. 1.0 • Published...
  • Page 71 NOTES...
  • Page 73 CONTACT US support@eg4electronics.com (903) 609-1988 www.eg4electronics.com...

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