Kostal Plenticore Hybrid, incl. grid charging of the house battery (battery)

Installation

1. 1Enable external battery control on the Kostal Plenticore Hybrid using installer-level access: navigate to the battery management section and set the control mode to 'External via protocol (Modbus TCP)', then configure a watchdog timeout of at least 30 seconds.
2. 2In the inverter's Modbus or SunSpec settings, set the byte order to Big-Endian (ABCD); without this, float32 register values will be decoded incorrectly by any external client.
3. 3Connect the Plenticore Hybrid's RJ45 port (Smart Communication Board) to the same LAN as the ModbusCloud Gateway, then add the device in the portal: enter the inverter IP address, port 1502, and unit ID 71 (the Kostal default).
4. 4Import this template in the ModbusCloud portal, assign it to the Gateway, and confirm the connection by checking that write operations to registers 1034 and 1040 are acknowledged without Modbus exception responses.

Things to watch for

01

Write commands are accepted but the battery ignores them. Why?

External battery control must be explicitly enabled in the inverter's installer menu and set to 'External via protocol (Modbus TCP)'. If the mode is set to internal or digital I/O, the inverter will silently discard Modbus setpoints. Confirm the mode with the installer access credentials and retry.

02

The inverter reverts to internal control after a short time. What causes this?

The Plenticore Hybrid uses a watchdog timer: if the setpoint registers are not written cyclically within the configured timeout period, the inverter falls back to its own battery management. Ensure the ModbusCloud Gateway is sending writes to at least one of these registers before the timeout elapses.

03

Register values read back as nonsensical large numbers. What is wrong?

The Plenticore Hybrid defaults to Little-Endian (CDAB) byte order. External clients expecting Big-Endian float32 will decode garbage values. Set byte order to Big-Endian (ABCD) in the inverter's Modbus or SunSpec settings, then re-read the registers to confirm plausible values.

04

Is it safe to write any watt value to the charge and discharge setpoint registers?

Use caution. Writing values that exceed the battery's or inverter's rated power limits can trigger protection faults or may affect warranty conditions. The setpoints are not stored persistently: they are discarded on inverter restart. Always test with conservative values first and verify behavior before deploying automated control logic.

Registers (2)

0 read / 2 write

More Kostal templates

Kostal Inverter

Kostal

Modbus RTU

Reads values from Kostal inverters via RS485 Modbus connection.

0 registers189

Kostal Modbus-TCP and Battery

Kostal

Modbus TCP

Reads energy yield, consumption, and battery data from Kostal inverters via Modbus TCP.

12 registers325

Kostal Smart Energy Meter KSEM

Kostal

Modbus TCP

Reads energy data from Kostal Smart Energy Meter via Modbus TCP

3 registers61

Kostal Plenticore Hybrid (battery)

Kostal

Modbus TCP

1 registers

Kostal Smart Energy Meter (via inverter) (grid)

Kostal

Modbus TCP

1 registers

Kostal Plenticore Ess

Kostal

Modbus TCP

17 registers

More TCP templates

Algodue Energy meter UEM80-2D E

Algodue Elettronica S.r.l.

Modbus TCP

Measures single-phase energy consumption and production via Modbus TCP.

12 registers46

Sigenergy SigenStore EC (grid)

Sigenergy

Modbus TCP

5 registers1

Fronius GEN24

Fronius

Modbus TCP

Monitors and controls Fronius GEN24 inverters and PV batteries via SunSpec Modbus TCP

0 registers762

HUAWEI SUN2000 Inverter & LUNA2000 battery

Huawei

Modbus TCP

Monitors HUAWEI SUN2000 inverter, LUNA2000 battery, and Smart Power Sensor via Modbus TCP.

4 registers1248

NIBE Nibe S-Series (SG Ready)

NIBE

Modbus TCP

5 registers1

Fronius - Modbus TCP

Fronius

Modbus TCP

Monitors Fronius Symo and Primo inverters via Modbus TCP

15 registers597