SAJ H2 Modbus

SAJ H2 Modbus is a local integration that reads data from SAJ H2 inverters over Modbus TCP. It adds sensors, numbers, switches and text entities, covering power, energy, temperature and battery values from the inverter's registers. The polling interval can be changed at any time, and a faster loop for key energy sensors runs every 10 seconds. An Ultra Fast mode publishes one-second values over MQTT, but it turns off the 10 second loop and leaves PV1 and PV2 power unpolled. Write entities allow passive battery charge and discharge at a set power level, an export limit, and switching between Self-Consumption and Time-of-Use modes. Setup runs in the UI by entering the inverter's IP address, port, sensor prefix and polling interval.