Before you start
Before you begin, make sure:
The AC-THOR 9s heating rod is physically installed and powered in a water tank according to manufacturer requirements
The AC-THOR 9s is updated to the latest software version
One temperature sensor is connected
The device will be used in Mode 1 - Hot water only
The my-PV Web GUI is installed on your device
IMPORTANT: A maximum of 1 my-PV heating device in Mode 1 - Hot water can be used per system and gateway. The connection of several devices and the master-slave function are not supported and can lead to incorrect control of the energy flows.
DANGER: Using the heating rod when not installed can cause damage to the device and injuries due to hot surfaces. Wrong values can cause harm to people and might potentially damage your heating system.
Step-by-Step Instructions
1. Connect the AC-THOR 9s to the network
Connect an Ethernet cable to the Ethernet port of the AC-THOR 9s
Verify the connection is established by checking the device display
For network infrastructure requirements and troubleshooting, see Infrastructure requirements for the gateway gateway.
2. Access the heating rod settings
The IP address of the heating rod can be found via the info section on the display of the unit
Open the my-PV Web GUI
Enter the IP address to login
Ensure that the Device state is set to On
3. Enable communication via Modbus
Navigate to:
Control settingsConfigure the following Modbus settings:
Control type:
Modbus TCPPower time out:
30 seconds
Save the settings
4. Configure hot water settings
Mode settings
When using the AC-THOR 9s in conjunction with a gateway, you can only use Mode 1 with one temperature sensor.
Navigate to:
Mode settingsConfigure the following settings:
Load priority: Select based on your heating element configuration. When using a single 9 kW three-phase heating element, keep this at default. The load priority determines the order of use when utilizing several single-phase heating elements
Save the settings
Hot water settings
Navigate to:
Hot WaterConfigure the following settings:
Temperature max. - Solar powered: Enter the maximum technical temperature for the installed hot water system
Boost mode:
Deactivate
Save the settings
Important: Deactivate the boost mode to ensure correct control of the energy management. You can set the minimum temperature within the energy management application, which is then valid at all times, even without surplus power/through grid supply.
Legionella protection (optional)
Activate legionella protection in the web portal to periodically heat the water to at least 60°C. During legionella heating cycles, the AC-THOR 9s is not controlled by the gateway.
5. Discover the heating rod in the commissioning wizard
The heating rod is now ready for the commissioning wizard. The gateway will scan the network to find available devices, which may take a few minutes. Once complete, the my-PV AC-THOR 9s will appear on the results page.
6. Configure temperature settings in the commissioning wizard
After the scan completes and the AC-THOR 9s is discovered, proceed through the commissioning wizard to the Heating Rod configuration step. Configure the three temperature thresholds:
Maximum temperature: Upper heating limit with PV surplus. Recommended: 80°C for space heating, max. 60°C at tap for domestic hot water. If the heating element has a thermostat, set it to the same value.
Comfort temperature: Above this value, only PV surplus is used for heating. Recommended: ca. 10°C below maximum temperature.
Minimum temperature: Below this value, grid supply is used as backup. Recommended: min. 10°C for frost protection; if the heating rod is the primary heat source, follow the heating installer's recommendation.
FAQ
Why isn't the heating rod appearing in the commissioning wizard?
Check that the AC-THOR 9s is connected via Ethernet and that Modbus TCP is enabled (Control type: Modbus TCP, Power time out: 30 seconds). Verify the device state is "On" and Mode 1 is selected. Check that the temperature sensor is properly connected. Restart the gateway and wait for the network scan to complete.
How do I update the firmware of the AC-THOR 9s?
Download the latest firmware from the my-PV website and perform the update through the Web GUI.
For detailed update instructions, refer to the official my-PV documentation.
Where can I download the my-PV Web GUI?
The my-PV Web GUI is not available in an app store. Download it from the my-PV website.
Why can't the Web GUI find my device?
Find the IP address of the AC-THOR 9s via the info section on the display. If the device still doesn't appear, manually enter the IP address in the Web GUI to connect.
Why is the load status showing 0 instead of 1?
If the load status shows 0, the circuit is not closed. This could be caused by a thermostat that is switched off or a safety temperature limiter that is triggered. Check the wiring and thermoswitch if installed.
Why isn't the temperature sensor reading showing?
If no temperature is displayed at Temperature sensor 1, check the physical connections. Error codes: 0°C indicates a broken probe, 85°C indicates data disruption from the temperature sensor.
Can I use the AC-THOR 9s in a mode other than Mode 1?
No. When using the AC-THOR 9s in conjunction with a gateway, you can only use Mode 1 - Hot water with one temperature sensor.
Can I connect multiple my-PV devices to one gateway?
No. A maximum of 1 my-PV heating device can be used per system and gateway. The connection of several devices and the master-slave function are not supported and can lead to incorrect control of the energy flows.
How do I verify the hardware connections are correct?
Navigate to the status page by clicking the status page button and review the state information values:
Load status: Each phase should show 1 (OK). A value of 0 means the circuit is not closed — check the wiring and thermoswitch if installed
Load nominal power: Should match the rated power of the connected heating rod according to the hardware specs
Temperature sensor 1: Should display the current temperature. Error codes: 0°C = broken probe, 85°C = data disruption
What thermostat temperature should I set on the heating rod?
Set the thermostat of the connected heating rod ideally to 80°C. If the system cannot sustain 80°C (due to pipes, seals, or tank limitations), set it as close to 80°C as possible. After commissioning, set the maximum temperature in the energy management application and keep both values synchronized at all times.
Supported models
AC-THOR 9s