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HomeAssistant ESPHome / RS485 Modbus Integration
Maybe for all Inverters of the following types

• POW-LVM3K-24V

• POW-LVM3.5K-48V

• POW-LVM5K-48V-H

• POW-HPM5.6KW

• POW-SunSmart SP5K

• POW-SUNSMART 10K

• POW-SunSmart 10KP

• POW-SunSmart 8KL3

• POW-SunSmart 12KL3 - tested (the only one i own :-))

• POW-SUNSMART-5.5KW-48V

• POW-SUNSMART-3.5KW-48V

• some SRNE X3 Models - I don't know the models, but they should also work because the MODBUS communication protocol documentation I used is from SRNE.

Usually used with PowMr Wifi Module - Wi-Fi Plug07/WIFI-HF - SRNE MS-W 09

What do you need?

Hardware

• 1 x ESP32 NodeMCU https://amzn.to/45ssngF or ESP32 NodeMCU with external antenna https://amzn.to/3RLFtjz
• 1 x TTL to RS485 Converter https://amzn.to/4c6Vhpd
• 1 x LAN Cable RJ45 (only a half of this)
• 1 x Housing 100mm x 60mm x 25mm https://amzn.to/3KZAoA7

Software

• HomeAssistant
• ESPHome as HomeAssistant Integration

This adapter, based on an ESP32, can be connected to the WiFi or RS485 interface of the inverter.

ESP32 WROOM Pinout (38 Pin)

ESP is powered over USB.

Pins used:

• 3V3 - VCC (TTL to RS485)
• GND - GND (TTL to RS485)
• GPIO16 (RX2) - TXD (TTL to RS485)
• GPIO17 (TX2) - RXD (TTL to RS485)

TTL to RS485 Converter

Pins used:

• A+ - Pin7 RJ45 Cable
• B- - Pin8 RJ45 Cable

PowMr Inverter Wifi Port / RS485

Wiring Diagram

Fully assembled