How to Log Growatt Solar Inverter Data with W5500 on ESP32

ESP32 with W5500 logs Growatt RS485 Modbus data to ThingSpeak every 120s for stable wired solar monitoring.

jakelee

Published March 06, 2026

26 UCC

4 VAR

Original author: F. Bisinger · GermanyOriginal source (new tab)

Components

Hardware components

Espressif - ESP32

x 1

Project description

Step 1: Understanding the Hardware This project combines three interfaces in one monitoring node: an ESP32 as the host MCU, a MAX485-class RS485 transceiver for Modbus communication with the Growatt inverter, and a W5500 Ethernet controller for wired TCP/IP uplink to ThingSpeak. The repository states it targets Growatt MIC 600 TL-X inverters, though similar models may work with small changes. The W5500 is the key WIZnet device here. It provides a hardwired TCP/IP stack, 10/100 Ethernet MAC and PHY, SPI operation up to 80 MHz, 8 independent sockets, and 32 KB internal buffer memory. In this…

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