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Reduxi with SAJ Electric

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⚡ Reduxi Controller · Knowledge Base

Reduxi with SAJ Electric

Integrate the SAJ CM2 BESS with the Reduxi Controller through Modbus TCP. This gives you maximum flexibility and lower cost and energy use.

🔧 SAJ CM2 BESS · Reduxi Controller
🌐 Modbus TCP/IP (Ethernet)
🔢 Port 502 (opens automatically)

📄 Download as PDF

SAJ CM2 Smart C&I All-in-One BESS
SAJ CM2 Smart C&I All-in-One BESS
📋 In this article
  1. Preparation
  2. Connect the SAJ CM2 to the Reduxi Controller
  3. Log in to the Reduxi web interface
  4. Add the SAJ CM2 to Reduxi
  5. Check the readings
  6. Summary
  7. Common issues
  8. Related articles

1 Preparation

1.1 Technical documentation

1.2 Required equipment

  • Reduxi Controller
  • SAJ CM2 battery system (CM2-EMS BESS)
  • Ethernet cable and a local router
  • Laptop or tablet with internet access to configure the device in Reduxi

2 Connect the SAJ CM2 to the Reduxi Controller

2.1 Requirements

For the CM2-EMS BESS to communicate with the Reduxi Controller, you need two things:

  • Modbus TCP/IP must be open.
  • The IP address of the SAJ CM2 battery system.

2.2 Connect the SAJ CM2 to the local network

The SAJ CM2 and the Reduxi Controller must be on the same network.

  • Connect the CM2 BESS to the local router through Ethernet. For detailed instructions, see the CM2 manual.
  • The Modbus port 502 on the CM2 opens automatically when you connect it through Ethernet.
Physical connection of the SAJ CM2 battery system and the Reduxi Controller through the local router
Physical connection of the SAJ CM2 and the Reduxi Controller

3 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
📱 3.1 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 (step 3)
Reduxi app – Open configurator
Open configurator (step 4)
🖥️ 3.2 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 Controller web interface
Controller web interface after login

4 Add the SAJ CM2 to Reduxi

Use these steps to add a new SAJ CM2 or to edit an existing one.

4.1 Basic settings

Log in locally to the Reduxi Configurator on the controller (see ⁠Point 3⁠) and click + Add device.

Add device button in the Reduxi Configurator
The Add device button

In the first step (basic settings), select the basic parameters of the device:

  • Device type: Hybrid Inverter
  • Type: SAJ CM2
  • Name: a name according to the model
Basic settings of the SAJ CM2 in the Reduxi Configurator
Basic settings: device type, type and name

4.2 Communication settings

Enter the Modbus ID and the IP address that you obtained from the SAJ CM2 system.

Communication settings of the SAJ CM2 in the Reduxi Configurator
Communication settings: Modbus ID and IP address

4.3 Test communication

Click Test communication at the bottom of the wizard. It reads the SAJ CM2 once and saves nothing. If the test succeeds, click Done: only Done creates the device.

Test communication button in the Reduxi Configurator
The Test communication button
Done button in the Reduxi Configurator
The Done button

If the test fails, check that you entered the correct Modbus ID and IP address. If the problem remains, contact the Reduxi Support Team.

5 Check the readings

5.1 Last measurements

After communication is established, check the values under Devices – SAJ CM2 in the Reduxi Configurator as an additional test.

Last measurements of the SAJ CM2 in the Reduxi Configurator
Last measurements of the SAJ CM2

5.2 Enable control by Reduxi

For advanced battery control, integrate the device into the Reduxi strategy. Under Devices – SAJ CM2 in the Reduxi Configurator, set the control type to AUTO. Only then do strategy commands affect the battery.

To achieve maximum flexibility and energy cost reduction with dynamic prices and dynamic tariffs, define a strategy as described in Strategies for Reduxi controller.

After you add the device, you can also monitor and control it in the Reduxi application.

✓ Summary

Preparation (Points 1–2): Use the SAJ CM2 manuals. Connect the CM2 to the local router with Ethernet, on the same network as the Reduxi Controller.

SAJ CM2 (Point 2): Modbus TCP/IP must be open. Port 502 opens automatically. Note the IP address and the Modbus ID.

Add to Reduxi (Points 3–4): Log in to the Reduxi web interface. Add the device, enter the Modbus ID and the IP address, and run Test communication.

Go live (Point 5): Check the last measurements. Set the control type to AUTO and define a strategy.

→ Common issues

Issue Solution
Test communication fails Check the Modbus ID and the IP address. Check that the SAJ CM2 and the Reduxi Controller are on the same network. Check that Modbus TCP/IP is open.
Open configurator does not open or stays empty The tunnel is not active yet. Wait about 30 seconds and check that the controller is online.
Login with admin is rejected The password was changed during installation. Ask the installer. The Reduxi account password does not work here.
reduxi.local does not load Your device is not in the same network as the controller. Use the IP address or the tunnel connection.
Communication test fails, device shows offline Check reachability, IP address / port / unit ID, and that the protocol is enabled on the device.

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