Kostal Inverters

Supported Devices

The EPSherpa EMS supports Kostal Pico inverters that use the "Kostal Pico protocol". This includes many inverters from the PIKO series.

Device Type	Modbus TCP (Ethernet)	RS485	Curtailment	Reactive power control
Kostal Pico Inverters	✅	✅	❌	—

Note

Curtailment While these inverters support active power control and feed-in limitation, the protocol driver used by the EPSherpa EMS does not currently support sending curtailment commands.

Configuration

Kostal inverters can be connected to the EPSherpa EMS via Modbus TCP (Ethernet) or RS485.

Modbus TCP (Ethernet)

Connect the inverter to the same local network as the EPSherpa EMS using an Ethernet (RJ45) cable.
The EPSherpa EMS communicates with the inverter on TCP Port 81.
The inverters are typically configured for DHCP by default, meaning they will get an IP address automatically from your network router.
You can access the inverter's built-in web server by typing its IP address into a web browser.

RS485

NOTE: RS485 Device Addresses

You MUST give each device a unique address on the RS485 bus. Check the device manual for instructions.
Use lower addresses first (1, 2, ...) because the EPSherpa EMS will find them faster!
For each device, it is generally recommended to keep the factory-default baud rate, parity, and stop bits. The EPSherpa EMS will scan those first.

The default RS485 bus address is often 1. If you have more than one inverter on the bus, you must assign a unique address to each one. This can typically be done via the inverter's display menu or web server.

Wiring

The physical RS485 connection varies by inverter model. Please consult your specific inverter's installation manual for the correct terminals and pinout.

Common Connection Types: Inverters may have either RJ45 sockets (for easy daisy-chaining) or a terminal block for the RS485 connection.
Required Signals: You will need to identify and connect the Data A, Data B, and Ground (GND) signals to the corresponding ports on the EPSherpa EMS.

Connect the inverter's RS485 terminals to the EPSherpa EMS as follows:

RS485 Wiring

For correct RS485 wiring: follow the RS485 wiring guidelines.
If the wiring shown in the table below is incorrect, please let us know.
There is no general industry consensus on the use of A and B for RS485 polarity, so the naming may be counterintuitive for some devices.

Device	EPSherpa EMS model OM1	EPSherpa EMS model IG8	RS485-USB converter	RS485-Ethernet converter
Data A	RS485 A	RS485_POS	RS485 A	TX+
Data B	RS485 B	RS485_NEG	RS485 B	TX-
Ground	RS GND	GND	Not available	G

Last updated October 26, 2026

Supported Devices

The EPSherpa EMS supports Kostal Pico inverters that use the "Kostal Pico protocol". This includes many inverters from the PIKO series.

Device Type	Modbus TCP (Ethernet)	RS485	Curtailment	Reactive power control
Kostal Pico Inverters	✅	✅	❌	—

Note

Curtailment While these inverters support active power control and feed-in limitation, the protocol driver used by the EPSherpa EMS does not currently support sending curtailment commands.

Configuration

Kostal inverters can be connected to the EPSherpa EMS via Modbus TCP (Ethernet) or RS485.

Connect the inverter to the same local network as the EPSherpa EMS using an Ethernet (RJ45) cable.

The EPSherpa EMS communicates with the inverter on TCP Port 81.

The inverters are typically configured for DHCP by default, meaning they will get an IP address automatically from your network router.

You can access the inverter's built-in web server by typing its IP address into a web browser.

NOTE: RS485 Device Addresses

You MUST give each device a unique address on the RS485 bus. Check the device manual for instructions.
Use lower addresses first (1, 2, ...) because the EPSherpa EMS will find them faster!
For each device, it is generally recommended to keep the factory-default baud rate, parity, and stop bits. The EPSherpa EMS will scan those first.

The physical RS485 connection varies by inverter model. Please consult your specific inverter's installation manual for the correct terminals and pinout.

Common Connection Types: Inverters may have either RJ45 sockets (for easy daisy-chaining) or a terminal block for the RS485 connection.

Required Signals: You will need to identify and connect the Data A, Data B, and Ground (GND) signals to the corresponding ports on the EPSherpa EMS.

Connect the inverter's RS485 terminals to the EPSherpa EMS as follows:

RS485 Wiring

For correct RS485 wiring: follow the RS485 wiring guidelines.
If the wiring shown in the table below is incorrect, please let us know.
There is no general industry consensus on the use of A and B for RS485 polarity, so the naming may be counterintuitive for some devices.

Device	EPSherpa EMS model OM1	EPSherpa EMS model IG8	RS485-USB converter	RS485-Ethernet converter
Data A	RS485 A	RS485_POS	RS485 A	TX+
Data B	RS485 B	RS485_NEG	RS485 B	TX-
Ground	RS GND	GND	Not available	G

Last updated October 26, 2026

Kostal Inverters

Supported Devices

Note

Configuration

Modbus TCP (Ethernet)

RS485

NOTE: RS485 Device Addresses

Wiring

RS485 Wiring

On this page

Kostal Inverters

Supported Devices

Note

Configuration

Modbus TCP (Ethernet)

RS485

NOTE: RS485 Device Addresses

Wiring

RS485 Wiring

On this page