From the manufacturer manual
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Solar inverters
PIKO IQ / PLENTICORE plus
171 registers
KOSTAL Modbus TCP interface of PIKO IQ and PLENTICORE inverters, covering the native register table with live AC, DC, battery and power meter values, yields, setpoints for active and reactive power, external battery management, battery limitation and plant (Multi Device Control) registers. The document also describes a SunSpec interface (models 1, 103, 113, 120, 123, 160, 203, 802); its model contents are not tabulated there, so no SunSpec rows are included. Availability of individual registers depends on the model and software version, see the notes.
All register maps · Modbus Poll