Solution: Reading Solax SK-SU5000(E) inverters & SDM630V2 Modbus Power Meters

Hardware
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That’s because the 630 uses Modbus RTU which is raw serial data. i.e. it’s not encapsulated
in a TCP frame like Modbus TCP.

In fact, that’s essentially what Modbus TCP is. i.e. a Modbus RTU packet in a TCP frame.
A Modbus RTU to Modbus TCP gateway attached to the 630 should enable you to poll the 630 from your Modbus TCP connection.

Eastron_SDM630Modbus_V2_user_manual_2016_V1_3.pdf (1.7 MB)

https://www.ebay.com/itm/USR-K7-Industrial-Super-Port-UART-Ethernet-Module-Modbus-RTU-to-TCP-IP-Module/274441506664?hash=item3fe5fd0f68%3Ag%3AFHgAAOSwrTBfH8ux&LH_BIN=1