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Reduxi meets my-PV: AC•THOR, AC•THOR 9s and AC ELWA 2

⚡ Reduxi Controller · Knowledge Base

Reduxi meets my-PV: AC•THOR, AC•THOR 9s and AC ELWA 2

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
my-PV AC ELWA 2, AC•THOR, AC•THOR 9s and heating rods
my-PV AC ELWA 2, AC•THOR and AC•THOR 9s with heating rods
📋  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.

System overview Reduxi with my-PV AC•THOR
AC•THOR / AC•THOR 9s via router
System overview Reduxi with my-PV AC ELWA 2
AC ELWA 2 via router

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:

LAN port on the underside of the AC•THOR
AC•THOR
LAN port on the underside of the AC•THOR 9s
AC•THOR 9s
LAN port on the underside of the AC ELWA 2
AC ELWA 2
⚠️
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
1 – Home screen: tap the gear icon
Setup 5/10 – Steuerung
2 – Setup 5/10: Steuerung (Control)
Steuerung 9/15 – Modbus TCP selected
3 – Steuerung 9/15: Modbus TCP selected
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.
Setup 3/10 – network settings
Setup 3/10 – network settings on the display
✅
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 – Reduxi devices
Activate the tunnel connection
Reduxi app – Open configurator
Open configurator
🖥️ 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 Controller login screen
Reduxi Controller login screen
Reduxi web interface
Web interface after login

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.
Add device button
+ Add device
Basic settings for the my-PV device
Device type HVAC, type myPV, name and strategy

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)
Communication settings for the my-PV device
Communication channel and device configuration
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.
Successful test communication with the my-PV device
Successful test result (AC•THOR 9s)
⚠️
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.
Unsuccessful test communication
Unsuccessful test result – here with the wrong port 501

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 my-PV device
Last measurement of the AC•THOR 9s – control type Auto, no communication error
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.