Fronius - Modbus TCP Integer+SF
Reads Fronius inverter data via Modbus TCP using SunSpec int+SF model
This ModbusCloud template reads AC voltage, current, power, frequency, and lifetime energy production from Fronius Symo, Primo, and Symo Hybrid inverters over Modbus TCP, using the SunSpec Integer plus Scale Factor register model. It is the right choice when you need raw register precision or when the Datamanager is configured in int+SF mode instead of float.
- Protocol
- Modbus TCP
- Connection
- Ethernet, Modbus TCP
- Registers
- 14, read only
- Brand
- Fronius
- Key readings
- AC Voltage Phase 1 to 3 · AC Current Phase 1 to 3 · AC Power · AC Frequency · AC Lifetime Energy Production
- Compatible models
- Fronius Symo · Fronius Primo · Fronius Symo Hybrid
- Last updated
Registers (14)
14 read, 0 write
| Name | Unit | Access | Address (Hidden until you enter your email) | Function (hidden) | Type (hidden) |
|---|---|---|---|---|---|
| AC Voltage Phase 1 | V | Read | |||
| AC Voltage Phase 3 | V | Read | |||
| AC Voltage Phase 2 | V | Read | |||
| AC Power | kW | Read | |||
| AC Frequency | Hz | Read | |||
| AC Current Phase 1 | A | Read | |||
| AC Current Phase 2 | A | Read | |||
| AC Current Phase 3 | A | Read | |||
| AC Lifetime Energy production | kWh | Read | |||
| AC Current Scale factor | Read | ||||
| AC Frequency scale factor | Read | ||||
| AC Lifetime Energy production scale factor | Read | ||||
| AC Voltage Scale factor | Read | ||||
| AC Power Scale factor | Read |
Loading registers…
Send your device list
If a device is not in the library yet, we build the template for free as soon as we have the register data.
Use cases
- Monitor Fronius inverters in installs where the Datamanager is configured for int+SF mode without touching that setting.
- Integrate a mixed-brand SunSpec fleet where consistency across vendors matters more than per-vendor convenience.
- Feed raw AC current and voltage with scale factors applied into a custom ModbusCloud automation for precise threshold detection.
- Report lifetime AC energy production to accounting systems that expect a single canonical energy source per inverter.
Installation
In the Fronius Datamanager web UI, enable Modbus TCP and set SunSpec Model Type to int+SF.
Note the inverter IP on the LAN and set a DHCP reservation.
In ModbusCloud, add a Modbus TCP device at the inverter IP, port 502, slave ID 1.
Import the Fronius Integer+SF template. The template applies scale factors automatically, no manual math needed.
Cross-check the first AC power reading against the inverter front panel to confirm the scale factors are being applied correctly.
Things to watch for
Why are my values 10x or 100x off compared to the inverter display?
That means the scale factor registers are not being applied. Confirm that the Datamanager is set to int+SF and that you imported the correct template (not the float variant). If values still look off, your firmware may have a known bug and an update is needed.
Should I use float or int+SF?
Float gives you ready-to-use values at the cost of needing exactly the right template. Int+SF is the SunSpec default and more portable, but requires applying scale factors. Both produce the same final numbers.
Want to see how it works?
