Kostal Plenticore PV-Inverter
The Kostal Plenticore is a three-phase hybrid PV inverter used in residential and commercial solar installations. This Modbus TCP template reads per-phase AC measurements across L1, L2, and L3, covering voltage, current, and active power for each phase, plus grid frequency, total active power, and the inverter's maximum apparent power rating. Together these registers give you a complete picture of AC output performance in real time. Connecting the Kostal Plenticore to ModbusCloud Gateway lets installers and asset managers track generation accurately without manual site visits.
- Protocol
- Modbus TCP
- Connection
- Ethernet, Modbus TCP
- Registers
- 12, read only
- Brand
- Kostal
- Last updated
Registers (12)
12 read, 0 write
| Name | Unit | Access | Address (Hidden until you enter your email) | Function (hidden) | Type (hidden) |
|---|---|---|---|---|---|
| frequency | Hz | Read | |||
| current_l1 | A | Read | |||
| active_power_l1 | W | Read | |||
| voltage_l1 | V | Read | |||
| current_l2 | A | Read | |||
| active_power_l2 | W | Read | |||
| voltage_l2 | V | Read | |||
| current_l3 | A | Read | |||
| active_power_l3 | W | Read | |||
| voltage_l3 | V | Read | |||
| max_apparent_power | W | Read | |||
| active_power | W | Read |
Loading registers…
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Use cases
- Monitor total active power output to verify the Kostal Plenticore is delivering expected generation at any time of day.
- Track per-phase active power on L1, L2, and L3 to detect phase imbalances caused by uneven string loading.
- Alert on grid frequency deviations outside the nominal 50 Hz band to catch grid instability events early.
- Compare per-phase voltages across L1, L2, and L3 to identify grid supply asymmetry at the installation site.
- Report historical active power trends over weeks and months to support yield guarantees or performance audits.
Installation
Enable Modbus TCP on the Kostal Plenticore by navigating to the inverter web interface or display menu and activating the Modbus/SunSpec (TCP) option under the communication settings.
Connect the Plenticore to the same LAN segment as the ModbusCloud Gateway using a standard Ethernet cable to its RJ45 port.
In the ModbusCloud portal, add the Gateway, import the Kostal Plenticore PV-Inverter template, and set the Modbus TCP target to port 1502 with Unit ID 71.
Spot-check the frequency register in the portal live view and confirm it reads approximately 50 Hz to verify connectivity and correct byte order.
Things to watch for
All register values are zero or clearly wrong. What happened?
The Kostal Plenticore ships with Little-Endian (CDAB) byte order by default. If your Modbus client expects Big-Endian (ABCD), all float32 values will be garbage. Check the byte order setting under the Modbus/SunSpec section of the inverter interface and align it with what your Gateway is configured to use.
The Gateway connects but no data appears in the portal.
Confirm that Modbus TCP is explicitly enabled on the inverter. The PLENTICORE has a dedicated MODBUS Enable register and the feature is off by default on some firmware versions. Also verify you are connecting to port 1502, not the standard Modbus port 502, and that the Unit ID is set to 71.
Per-phase power values on L1 look correct but L2 and L3 read zero.
This usually means only one phase worth of registers is being polled. Ensure the template is importing all three phase register groups and that your Modbus client is not stopping at the first null response. Check for any firmware-imposed read limits on contiguous register blocks.
The inverter is reachable but the max apparent power register reads an unexpected value.
Register 531 returns a uint16 and represents the inverter's rated maximum apparent power. The value reflects the power class of the specific installed unit. If the reading seems low, confirm the inverter's power class in its device information menu and cross-check with the installed hardware model.
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