Hoval PV-Heater

Use cases

• Monitor water temperature and actual heater load on a live cloud dashboard for each customer site.
• Set the power step remotely to match real-time PV surplus and avoid grid feed-in.
• Create an alert when emergency mode activates, indicating a potential overtemperature or communication fault.
• Log total energy consumed by the PV-Heater over time to generate monthly self-consumption reports.
• Adjust the temperature limit remotely to match seasonal heating demand without an on-site visit.
• Track actual load versus load setpoint to verify the heater responds correctly to control commands.

Installation

1. 1Wire the Modbus gateway to the Hoval PV-Heater using Modbus RTU (RS-485 two-wire) or connect via Modbus TCP over Ethernet to the same network segment.
2. 2Open the PV-Heater web interface and activate Modbus TCP or Modbus RTU, depending on your wiring choice.
3. 3Set the rotary temperature controller on the PV-Heater housing to maximum (85°C) so that Modbus-based temperature limits take effect.
4. 4Configure the Modbus slave address on the PV-Heater to match the address set in the ModbusCloud gateway.
5. 5Import the Hoval PV-Heater template in the ModbusCloud platform and assign it to the connected gateway.
6. 6Set the repetition interval to 7 seconds in the gateway configuration to ensure continuous communication with the heater.

Things to watch for

Registers (8)

4 read / 4 write

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