sunspec

Home Assistant integration for Steca inverters (Kostal Plenticore platform): reads via SunSpec/Modbus TCP and the Kostal web API, and dynamically curtails feed-in power against a grid sensor.

A Rust site controller between a German DSO (IEC 60870-5-104, TLS) and a prosumer site (SunSpec Modbus): §14a EnWG dimming, feed-in limits, fail-safe design. Live WebAssembly demo.

ESP32 SmartMeter that reads Kaifa MA309 data, converts it to Sunspec and provides it via Modbus RTU server

emit sunspec data from modbus to MQTT

A delightful little SunSpec library for Java.

Research on SunSpec

Rust edge service that polls SunSpec Modbus inverters and streams normalized Avro data to Kafka.

This project shows a dashboard with relevant parameters such as a battery energy for a solar car.

Liest die Sunspecdaten aus dem SAM Welchselrichter

A reproducible bench for Pylontech CAN to SunSpec Modbus bridging, and five places where "compatible" implementations disagree.

Home Assistant integration for Fronius inverters, storage systems and smart meters using SunSpec Modbus TCP.

Reading data from your solar inverter

FIMER (ABB / Power-One) PV inverters - Modbus TCP SunSpec integration for Home Assistant

Monitor and control KACO solar inverters in Home Assistant over SunSpec Modbus TCP

SPARK-verified Ada 2022 Modbus library with SunSpec energy management and C API

Service that publishes data from SunSpec-compliant inverters to an MQTT broker

Library used for discovering and reading data from electric energy devices, like inverters and smart meters.

SunSpec Modbus → MQTT/InfluxDB bridge for Fronius inverters and smart meters. Home Assistant autodiscovery, monitoring dashboard with per-inverter power-limit control.

Software-defined gateway for meters, inverters and sensors: Modbus TCP/RTU, HTTP/JSON and MQTT in; MQTT, InfluxDB, Home Assistant and virtual Modbus meters out. Templates, a rules engine, an operator UI. Runs a real PV site since 2026.

Fronius Symo Hybrid battery charging/discharging limits setting with Modbus TCP