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How to connect my-PV AC•THOR, AC•THOR 9s and AC ELWA 2 with Reduxi controller

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⚡ Reduxi Controller · Knowledge Base

How to connect my-PV AC•THOR, AC•THOR 9s and AC ELWA 2 with Reduxi controller

Integrate my-PV power controllers and heating rods into the Reduxi Controller via Modbus TCP – so PV surplus automatically goes into hot water and heating.

⏱ approx. 15–20 min
🔧 Reduxi Controller · my-PV AC•THOR / AC•THOR 9s / AC ELWA 2
🌐 Modbus TCP (LAN / Wi‑Fi via router)
🔢 Up to 250 my-PV devices per controller
📄 Download as PDF
my-PV AC ELWA 2, AC THOR, AC THOR 9s and heating rods for AC THOR
my-PV AC ELWA 2, AC•THOR and AC•THOR 9s with heating rods
Text description of this image

Photo collage on a white background of four my-PV products, left to right, each with a dark green label below. AC ELWA 2: a small black device with a silver front and a colour display, with a heating rod sticking out to its left. AC•THOR: a tall white and silver wall unit with a black front, MYPV logo, colour display showing 789W, and the name ACTHOR printed below the display. AC•THOR 9s: the same type of unit with the display showing 3403W. Heating rods for AC•THOR: two long metal rods with black connection boxes, one with a black cable.

📋  In this article
  1. Technical documentation
  2. Required equipment
  3. System overview
  4. Configure the my-PV device
  5. Log in to the Reduxi web interface
  6. Add the my-PV device to Reduxi
  7. Check readings & enable control

1 Technical documentation

Before commissioning, read the installation instructions supplied with the device and the current my-PV operating manual:

2 Required equipment

  • Reduxi Controller – Stand Alone or DIN rail
  • Grid measurement at the grid connection point: if a PV inverter is connected to Reduxi and its smart meter is read via the inverter, no additional meter is needed. If the my-PV device is the only device on the Reduxi Controller, install an energy meter or smart meter – see the list of supported devices
  • my-PV AC•THOR, AC•THOR 9s or AC ELWA 2 with the latest firmware
  • Network connection (LAN or Wi‑Fi) – my-PV device and Reduxi Controller in the same network, connected via a router
  • Laptop, tablet or smartphone with internet access

3 System overview

The AC•THOR or AC ELWA 2 and the Reduxi Controller are connected to the same network via a router. Over this network, the Reduxi Controller tells the my-PV device via Modbus TCP how much power to consume – for example the current PV surplus.

Diagram: Reduxi controller and my-PV AC THOR both connect via Ethernet or WiFi to a router with internet
AC•THOR / AC•THOR 9s via router
Text description of this image

Diagram on a white background. Top left: a dark grey Reduxi controller box with the reduxi logo, two Ethernet ports and a green terminal plug on its right side. Top right: a my-PV ACTHOR unit with the MYPV logo and a display showing 3403W. Centre: a white router with antennas and a Wi-Fi symbol. Bottom left: a teal globe icon with the text www. Connections: a solid teal line from the Reduxi controller down to the router, labelled Ethernet / WiFi; a solid teal line from the ACTHOR unit down to the router, labelled Ethernet / WiFi; a dashed teal line from the router to the www globe (internet).

Diagram: Reduxi controller and my-PV AC ELWA 2 connect via Ethernet or WiFi to a router with internet
AC ELWA 2 via router
Text description of this image

Diagram on a white background. Top left: a dark grey Reduxi controller box with the reduxi logo, two Ethernet ports and a green terminal plug on its right side. Top right: a my-PV AC ELWA 2 unit with the MYPV logo, a colour display and a metal heating rod extending to the upper right. Centre: a white router with antennas and a Wi-Fi symbol. Bottom left: a teal globe icon with the text www. Connections: a solid teal line from the Reduxi controller down to the router, labelled Ethernet / WiFi; a solid teal line from the AC ELWA 2 unit down to the router, labelled Ethernet / WiFi; a dashed teal line from the router to the www globe (internet).

Connect the my-PV device to the router with a network cable or via Wi‑Fi. The LAN port (marked) is on the underside of the device:

Underside of the AC THOR with the LAN port highlighted by a cyan box
AC•THOR
Text description of this image

Photo of the underside of a light grey metal device. A cyan (light blue) box highlights the RJ45 network (LAN) port in the upper middle. Left of it: a round socket with a recessed contact (earthing clip visible). Right of the LAN port: a small round opening, an orange push-in terminal block with several openings, and a black plug connector with orange parts. A thick black cable leaves the device on the right side. Ventilation slots run along the lower middle. No text is printed in the visible area.

Underside connectors of the AC THOR 9s with the LAN port highlighted by a cyan box
AC•THOR 9s
Text description of this image

Photo of the underside connector side of a light grey device. A cyan (light blue) box highlights an RJ45 network (LAN) port in the upper middle. Left: ventilation slots. Right of the LAN port: a round button or opening and two black plug connectors at the top. Lower row of black screw/plug terminals with printed labels: OUT-1 (L1, PE, N), OUT-2 (L2, PE, N), OUT-3 (L3, PE, N) and IN (PE, N, L1, L2, L3). A small slot is visible above the LAN port area, to its right.

Underside of the AC ELWA 2 with the LAN port highlighted by a cyan box
AC ELWA 2
Text description of this image

Photo of the underside terminal area of a grey device with a cyan (light blue) box around the RJ45 network (LAN) port at the right. Below the port is a gold SMA-type antenna connector. Left to right: a green 3-pole plug marked L, PE, N and 230/240 VAC; a black cover with an MYPV logo above a connector marked NO COMM and 230/240 VAC with a maximum current rating; a green 8-pole plug with rotated labels on the metal plate, including Temp-sensor, PWM In/Out, GND, RS485 A and B, WiFi LAN.

⚠️
Do not also connect the my-PV device directly to the inverter or battery system The my-PV device is controlled exclusively by the Reduxi Controller. Additional direct control by an inverter or battery system leads to conflicting setpoints.
ℹ️
Up to 250 devices In theory, one Reduxi Controller can control up to 250 my-PV devices.

4 Configure the my-PV device

Prepare the my-PV device first. Then continue with ⁠Point 5⁠.

4.1 Set the control type to "Modbus TCP"

The photos show an AC•THOR 9s with the display language set to German – the menu items are in the same place in other languages.

1
Open the setup menu
On the home screen, tap the gear icon at the bottom.
2
Open "Steuerung" (Control)
Use the arrow keys to page to Setup 5/10 and tap Steuerung (Control).
3
Select Modbus TCP
Use the arrow keys to page to Steuerung 9/15 and tap Modbus TCP. The selected entry is highlighted in green.
my-PV AC THOR home screen showing ACTHOR 9s 1-M1 and 33.1°C, gear icon at the bottom
1 – Home screen: tap the gear icon
Text description of this image

Photo of the front panel of a my-PV device with the MYPV logo at the top and the AC THOR logo at the bottom. The colour display shows the home screen: date and time 07.10.26 21:20:33, device name ACTHOR 9s 1-M1, green up/down arrows, a large temperature 33.1°C, a tank symbol on the right, a power bar with scale 0W 1.0W 2.0W 3.0W. Bottom icon bar: signal bars, info icon, house icon (highlighted green, home screen), gear icon, question mark. Below the display a white label with a warning triangle and wiring sketch reads: 400V Verbraucher immer nur mit Nullleiter anschließen! [Always connect 400V loads only with neutral conductor] and Always connect 400V loads with neutral conductor!, and Spannungsmessung/Voltage measurement with a ticked correct and a crossed wrong terminal sketch (Beschädigt Kontakte / Damaged terminals).

Device display Setup 5/10 with menu entry Steuerung (Control) highlighted
2 – Setup 5/10: Steuerung (Control)
Text description of this image

Photo of the colour display of a device, blue background, white text. Top bar: date and time 07.10.26 21:21:54, title Setup 5/10, green up/down arrows. Menu in German: Steuerung [Control] (highlighted, bright white), Ctrl IP (dimmed), Zielwert Regelung [target value control] (dimmed, partly hidden by reflection), Sensoren [sensors] (bright white). White arrow on the left and right sides. Bottom icon bar: signal bars (dimmed), info icon, house icon, gear icon (highlighted, lighter blue), question mark. The right edge of the image is white.

Device display Steuerung 9/15 with menu entry Modbus TCP selected
3 – Steuerung 9/15: Modbus TCP selected
Text description of this image

Photo of the colour display of a device, blue background, white text. Top bar: date and time 07.10.26 21:22:19, title Steuerung 9/15 [Control 9/15], green up/down arrows. Menu list: MEC electronics Manual; Modbus TCP (highlighted with a green bar, selected); Oesterr. Energie SM-Adap; QCELLS (Modbus RTU). White arrow on the left and right sides. Bottom icon bar: signal bars (dimmed), info icon, house icon, gear icon (highlighted green), question mark. The right edge of the image is white.

ℹ️
Alternative: my-PV web interfaceThe same setting can also be made in the my-PV web interface. Setting it on the display is usually quicker, because you are at the device anyway and do not need its IP address yet.

4.2 Assign a fixed IP address

The IP address of the AC•THOR or AC ELWA 2 must be static. Otherwise the Reduxi Controller loses the connection as soon as the router assigns a new address. There are two ways to do this:

  • Recommended – DHCP reservation in the router: leave the my-PV device on DHCP and reserve its current IP address in the router.
  • Static IP on the device: on the display, page to Setup 3/10, set IP DHCP/statisch to static and enter IP Adresse (IP address), Subnetz Maske (subnet mask) and Gateway Adresse (gateway address). Choose an address outside the router's DHCP range.
my-PV AC THOR display showing network settings page Setup 3/10 with IP address menu
Setup 3/10 – network settings on the display
Text description of this image

Photo of the small colour display of a device with a blue background and white text. Top bar: date and time 07.10.26 21:21:42, title Setup 3/10, a green check mark and green up/down arrows. Menu lines in German: IP DHCP/statisch [IP DHCP/static], IP Adresse [IP address], Subnetz Maske [subnet mask], Gateway Adresse [gateway address]. A white arrow points left on the left side and one points right on the right side. Bottom icon bar: signal bars (dimmed), info icon, house icon, gear icon, question mark. The lower part of the label below the display is partly visible and reads 400V Verbraucher. The right part of the image is white.

✅
Note down the IP addressYou will need it in ⁠Point 6.2⁠.

5 Log in to the Reduxi web interface

You can open the Reduxi web interface in two ways:

Remote
📱
Reduxi app
Via tunnel connection · works from anywhere
🖥️
Web browser
In the local network · via IP address or reduxi.local
📱 5.1 Via the Reduxi app
1
Open the app and log in
Launch the Reduxi app on your smartphone or tablet and log in with your credentials.
2
Open Reduxi devices
Tap the menu icon (three lines, top left) and select Reduxi devices.
3
Activate the tunnel connection
Switch on the tunnel connection and wait a moment until it is active.
4
Open the configurator
Tap Open configurator. The Reduxi web interface opens.
Reduxi app: menu icon (2), Reduxi devices (3), Activate tunnel connection button (4)
Activate the tunnel connection
Text description of this image

Screenshot of three Reduxi mobile app screens side by side, with cyan boxes and number badges 2 to 4. Left screen (dashboard, dark theme): menu icon at top left marked with a box and badge 2; 'reduxi' logo; tabs 'Real time data' (active) and 'Statistics'; price 5.79 € and temperature 3.2 °C; energy flow diagram with a house in the centre (-1.25 kW) and icons with values 69.0 W, 1.3 kW, 1.1 kW (red ring), -165.0 W with 97 % (red ring) and 0.0 W values at the bottom; tabs 'Power' and 'Energy'; bottom navigation: Dashboard, Diagnostics, Device control, Settings. Middle screen (side menu): 'reduxi' logo, 'Number of locations: 1233', heading 'Reduxi device management', entries '+ Add Reduxi location' and 'Reduxi devices' (marked with a box and badge 3), then 'My profile' and 'About app'. Right screen (device page): Back; picture of a black Reduxi controller with two Ethernet ports; status 'Connected'; card 'Update available': 'New update is available for your Reduxi device.' with button 'Download and install update'; card 'Connect to configurator': 'Tunnel connection enables remote access to your Reduxi configurator, without need to be connected to the same local network.' with button 'Activate tunnel connection' (marked with a box and badge 4); card 'Unit details' with field 'Unit ID'.

Reduxi app Open configurator button (step 5) and Reduxi Configurator tunnel connection home screen (step 6)
Open configurator
Text description of this image

Screenshot made of two parts side by side. Left part: Reduxi mobile app screen on a dark background. Top: Back button; picture of a black Reduxi controller with two Ethernet ports and a terminal block; status 'Connected' with a Wi-Fi icon. Card 'Update available': 'New update is available for your Reduxi device.' with button 'Download and install update'. Card 'Connect to configurator' with a key icon: 'Tunnel connection enables remote access to your Reduxi configurator, without need to be connected to the same local network.' and button 'Open configurator', marked with a cyan box and number badge 5. Below: card 'Unit details' with a field 'Unit ID' (value not visible). Right part: Reduxi Configurator opened in a browser, marked with a cyan frame and number badge 6. Header: back arrow, 'Tunnel connection', reload icon. Left sidebar with icons (lightning, chip, lightning bolt, bar chart, gear). Page 'Home' with a green link icon. Green notice: 'New patch available. Click here to apply.' with a close X. Time 09:12:56. Energy flow diagram with a house in the centre (1.700 kW) and icons for grid (0.000 kW), solar (1.700 kW), battery (green, 0.000 kW and 0.800 kW), a device at left (0.900 kW), electric vehicle and a charger or device at bottom. Label 'Energy manager' at the bottom.

🖥️ 5.2 Via a web browser
1
Open the login page
On a device in the same network, open a web browser and enter the controller's IP address or http://reduxi.local.
You can find the controller's IP address in your router's device list or in the Reduxi app under Reduxi devices.
2
Log in
Username: admin · Password: admin (factory default)
Reduxi Configurator login page at address reduxi.local, address bar marked
Reduxi Controller login screen
Text description of this image

Screenshot of the Reduxi Configurator login page in a Chrome browser window. The address bar shows 'Not secure' and 'reduxi.local'; the address bar is marked with a cyan box and an enlarged copy of it (cyan box, text 'Not secure reduxi.local') is shown at the left, connected by a cyan line. Page background: light grey line drawing of a house with solar panels (green), a wall box, an inverter, a car and a charger. Top left: 'reduxi configurator' logo. Login box in the centre with title 'Login', a language selector (English flag, 'English'), a username field and a password field, and a dark 'Login' button.

Reduxi Configurator home screen after login: energy flow with house 24.20 kW, grid 24.20 kW, EV charger 31.00 kW
Web interface after login
Text description of this image

Screenshot of the Reduxi Configurator web interface after login, light theme. Top left: 'reduxi configurator' logo. Header bar: 'Home' at left, green 'Connected' status at top right. Left sidebar: expanded section 'Devices' with a list of entries, then collapsed sections 'Manager' and 'Configuration' and 'Settings'. Main area: energy flow diagram. House in the centre with ring, value 24.20 kW. Grid icon at top left, 24.20 kW (red dot on its line). Solar icon at top right, value '-'. Left icon (battery or device), 6.700 kW (green dot on its line). Right icons (battery storage and a device), values '-'. EV charger icon at bottom left, 31.00 kW. A further device icon at bottom right. Label 'Energy manager' below the house.

6 Add the my-PV device to Reduxi

ℹ️
Note Further information and images were kindly provided to my-PV by Reduxi. my-PV accepts no liability for the accuracy of the information or for the screens being up to date.

6.1 Basic settings

1
Click + Add device
On the controller's main page, select + Add device.
2
Define the device
Device type: HVAC
Type: myPV
Name: any name, e.g. myPV AC Thor 9s
Include to strategy: tick Regulated devices for the strategy that should control the my-PV device.
Confirm with Next.
Reduxi Configurator menu with Add device button highlighted under Devices
+ Add device
Text description of this image

Screenshot of the left navigation menu of the Reduxi Configurator (logo reduxi Configurator at the top). Section Devices (expanded, minus sign) lists two device icons: a car icon and a power pylon icon. Below them the entry + Add device is highlighted with a cyan box. Further menu entries: Strategies (plus sign), Utility Rate Plan, Settings (plus sign).

Reduxi Configurator basic settings: device type HVAC, type myPV, name myPV AC Thor 9s
Device type HVAC, type myPV, name and strategy
Text description of this image

Screenshot of the Reduxi Configurator wizard step titled Basic settings. Device type *: HVAC (dropdown). Type *: myPV (dropdown). Name *: myPV AC Thor 9s (field active, blue outline). Section Include to strategy: table with columns Strategy, Measurement devices, Regulated devices. One row: Strategy: Energy manager new; Measurement devices: checkbox not ticked (greyed); Regulated devices: checkbox ticked. Buttons: Back (outlined, left), link How to configure? and Next (black, right).

6.2 Communication settings

In the next window, enter the IP settings. Port and Modbus unit ID are filled in automatically.

Parameter Value
Connection TCP/IP
IP IP address of the my-PV device (fixed, see ⁠Point 4.2⁠)
Port 502 (filled in automatically)
Extended IP recovery Yes
Modbus unit ID 1 (filled in automatically)
Reduxi Configurator communication settings: TCP/IP, IP 10.0.0.252, port 502, unit ID 1
Communication channel and device configuration
Text description of this image

Screenshot of the Reduxi Configurator form titled Communication channel and device configuration. Connection *: TCP/IP (dropdown). IP *: 10.0.0.252, with black button Scan for IP. Port *: 502, with black button Test port. Extended IP recovery (info icon): toggle set to Yes. Modbus unit ID *: 1. Buttons at the bottom: Back (outlined, left), link How to configure?, Test communication (outlined) and Done (black).

ℹ️
IP address unknown? Click Scan for IP next to the IP field to list the devices in the network, or check the device list in your router. Test port checks whether port 502 is reachable.

6.3 Test communication

Click Test communication to check whether the Reduxi Controller can read data from the my-PV device.

✅
Test successful The window shows "Successful readout from device" with the current values of the my-PV device (e.g. model name, power and temperatures). Close the window and confirm your entries with Done.
Reduxi Configurator Test communication dialog: successful readout, model ACTHOR 9S
Successful test result (AC•THOR 9s)
Text description of this image

Screenshot of the Reduxi Configurator dialog Test communication (close X at top right) shown over a dimmed page. Message in green text: Successful readout from device. Values listed: Active power MAX: 9000.0 W; Active power: 0.0 W; Error: false null; Import active energy: 0 Wh; Model name: ACTHOR 9S null; State name: STARTUP null; Temperature room MAX: 22.0 °C; Temperature room MIN day: 20.0 °C; Temperature room MIN night: 20.0 °C; Temperature water MAX: 85.0 °C; Temperature water MIN: 50.0 °C; Temperature: 31.7 °C. Button: Close (black, bottom right).

⚠️
Test failed Close the window and check the port (502), the IP address and the control type Modbus TCP on the my-PV device. Then repeat the test. If the ping in the result is successful, the network connection works and the cause is the port or the Modbus setting on the my-PV device. See also ⁠Common issues⁠.
Reduxi Configurator test communication failed on port 501, device 10.0.0.252 reachable by ping
Unsuccessful test result – here with the wrong port 501
Text description of this image

Screenshot of the Reduxi Configurator dialog Test communication (close X at top right) over a dimmed page. First box in red text: Unable to communicate with device. Second box in red text: Unable to communicate with 10.0.0.252 on port 501. Check if service is enabled on device and port number is correct. PING 10.0.0.252 (10.0.0.252) 56(84) bytes of data. 64 bytes from 10.0.0.252: icmp_seq=1 ttl=128 time=0.446 ms. 64 bytes from 10.0.0.252: icmp_seq=2 ttl=128 time=0.388 ms. --- 10.0.0.252 ping statistics ---. 2 packets transmitted, 2 received, 0% packet loss, time 1009ms. rtt min/avg/max/mdev = 0.388/0.417/0.446/0.029 ms. Button: Close (black). Behind the dialog, Back, How to configure and Test communication buttons are partly visible.

7 Check readings & enable control

7.1 Check the readings

In the Reduxi web interface, open Devices → [name of the my-PV device] → Last measurement.

Last measurement of the AC THOR 9s: control type AUTO, communication error OFF
Last measurement of the AC•THOR 9s – control type Auto, no communication error
Text description of this image

Screenshot of the device readings page for the my-PV device. Left column: card Control type with toggle Auto (selected, turquoise) and Manual (black), timestamp 07. 10. 2026 20:20:46. Card Power: Active power 0.0 kW; Active power MAX 9.0 kW. Card Energy: Import active energy 1.9 kWh. Right card Other: Communication error OFF; Control type AUTO; Error OFF; Model name ACTHOR 9S; State name STARTUP; State name setpoint OFF; Temperature 31.60 °C; Temperature room MAX 22.00 °C; Temperature room MIN day 20.00 °C; Temperature room MIN night 20.00 °C; Temperature water MAX 85.00 °C; Temperature water MIN 50.00 °C. Each value has a timestamp of 07. 10. 2026 around 20:20:48.

What you see Meaning
Communication error OFF, values are read Communication works.
Communication error ON, all values are 0 No communication – the settings do not match. Check Point 4 and Point 6.2, or see Common issues.

7.2 Enable control by Reduxi

In the Control type box of the device view, select Auto. Only then do the commands of the Reduxi strategy reach the my-PV device. With Manual, the device is not controlled by the strategy.

ℹ️
Prerequisite: grid measurement Control based on PV surplus needs the power at the grid connection point. It comes either from the smart meter of the PV system, read via the inverter, or – if the my-PV device is the only device on the Reduxi Controller – from a separate energy meter / smart meter. Either way, it must already be set up in the Reduxi web interface and deliver values.

Next step: choose and configure the strategy – see Strategies for the Reduxi Controller under Related articles.

✓ Summary

Preparation (Points 1–3): Have the my-PV manual, a Reduxi Controller, grid measurement (smart meter of the PV inverter or a separate meter) and a my-PV AC•THOR, AC•THOR 9s or AC ELWA 2 ready. The my-PV device and the controller are in the same network via a router.

my-PV device (Point 4): Set the control type to Modbus TCP on the display (or in the my-PV web interface) and reserve a fixed IP address in the router.

Add to Reduxi (Points 5–6): Open the Reduxi web interface via the app (tunnel) or a browser, add device type HVAC / type myPV, enter the IP (port 502, Modbus unit ID 1) and run the communication test.

Go live (Point 7): Check the last measurement (communication error OFF), set the control type to Auto and configure the strategy. Grid measurement (smart meter of the PV inverter or a separate meter) must already be set up.

→ Common issues

Issue Solution
Test fails with "Unable to communicate … on port 501", ping is successful The network works, but the port is wrong or Modbus TCP is not active. Set the port to 502 and check that the control type on the my-PV device is Modbus TCP.
Test fails, ping is not successful The my-PV device is not reachable: check the IP address, and that the device and controller are in the same network.
Connection worked, then stopped The my-PV device probably received a new IP address from the router. Reserve a fixed IP in the router and enter it in the Reduxi web interface.
Readings are shown, but the device doesn't follow the strategy Set the control type to Auto, check that Regulated devices is ticked for the strategy, that a strategy is active and that the grid measurement delivers values.
my-PV device receives conflicting setpoints Make sure the device is not also controlled directly by an inverter or battery system – only the Reduxi Controller sets the power.
Can't open the controller via reduxi.local Enter the controller's IP address instead (router device list or Reduxi app → Reduxi devices), or use the tunnel connection in the Reduxi app.

Related to