This page describes the configuration and installation of a KACO NX3 inverter on a SOLARWATT Manager flex
Table of contents

    Update Wifi dongle

    The network communication of the KACO NX 3 series inverters takes place via a separate Wifi dongle. The software on this device is subject to regular updates by KACO.

    The connection to the SOLARWATT Manager flex and the Energy Manager pro was successfully verified with firmware version 610-50057-12-15R.002 .

    Unfortunately, with version 21618-015R published by KACO on 31.08.2023, installation on the SOLARWATT Manager flex or the Energy Manager pro is no longer possible.

    Operation of the KACO communication unit (Wifi dongle) with firmware 610-50057-12-15R.002 is still possible . However, this version can no longer be obtained via the myKaco download portal. Version 610-50057-12-15R.002 and installation instructions are available under Update the Wifi dongle further down on this page.


    EnergyManager pro*Manager flexFirmware
    blueplanet NX3 M2 (3.0 - 20.0)

    blueplanet NX3 M3 (25.0 - 33.0)


    Full compatibility

    No compatibility

    *) Non-compatible inverters can be recorded using separate power meters or energy meters: Non-compatible inverters

    Installation and configuration

    Interface: WLAN (via Kaco communication unit)


    • Smartphone/tablet with KACO Tool App
    • separate communication unit (WiFi dongle) on the inverter
    • DC voltage at the inverter
    • Firmware version of the communication unit 21618-011R or 610-50057-12-15R.002

    Applicable documents

    Step-by-step instructions

    • Dial into the local network with your smartphone/tablet.
    • Start the KACO Tool app.
    • Select Commissioning and scan the QR code on the WiFi dongle.
    • Connect to the temporary WiFi, the access point corresponds to the serial number of the inverter.
    • Select the WiFi with which the inverter is to be configured via the communication unit and enter the WiFi password.
    • After successful network configuration, the device serial number, software version and system time are displayed.
    • Click Confirm.
    • Switch to operating mode.
    • Click on Monitoring & control.
    • Activate Modbus-TCP server mode.
    • Return to the main menu of the communication unit.
    • Click on Select inverter and select the corresponding inverter.
    • Click on External write access and activate the Sunspec Modbus / KACO legacy protocol option.

    Firmware update of the communication unit (Wifi dongle)

    Installation of the KACO NX3 on the Manager flex / EnergyManager pro requires operation of the communication unit with firmware version 21618-011R or 610-50057-12-15R.002

    Download and provision of firmware version 610-50057-12-15R.002

    • Download the file archive (*.zip file) here: SW Package V2.0 15.002.zip
    • Unpack the archive and, if necessary, transfer the update.bin file from the WiFi Stick 610-50057-12-15R.002 order to the mobile device on which you are running the KACO Tool App.

    Installing the firmware

    • Connect to the communication unit(operating mode) via the KACO Tool App.
    • Call up Firmware update .
    • Click on Local update and navigate to the update.bin file.
    • Wait for the update to install.
    • Once the installation is complete, check the version number under Firmware version.


    The inverter cannot communicate with the KACO Tool App and the Manager flex at the same time. Therefore, close the app before continuing with the setup of the Manager flex

    Device search in SmartSetup

    • Starting the SmartSetup
    • Select or search for the Sunspec device (Kaco NX3) entry in the Select devices drop-down menu.
    • Enter the following specifications:


    This is the host name of the communication unit. If the installation fails, alternatively use the

    [IP address] of the communication unit

    this can be found in the KACO Tool App under the menu item Communication unit properties.



    • Click Add device to search.
    • Add further devices to the search if necessary.
    • After adding all devices to be searched for, click Search and install devices.

    After successful installation, the KACO NX3 inverter appears with the message Device is installed and the display of the current generation power in the device overview. An indicator of an existing Modbus connection between the Manager flex and the inverter is also a permanently lit blue LED on the Wifi dongle.

    • Connect additional devices if necessary
    • Continue with SmartSetup PV systems


    If the installation of the KACO NX3 fails repeatedly, restarting the communication unit can help. To do this, disconnect the Wifi dongle from the inverter for a short time and then repeat the device search in SmartSetup.