Axpert inverter in Home Assistant

Without a Raspberry Pi on the inverter

Many owners read their Axpert with a small computer, a USB or serial cable and a script. It works until the SD card fails or the script stops after an update. MoniWatt for Axpert is a dedicated box that does only this job and sends the result to Home Assistant over MQTT.

Sensors

• sensor.axpert_monitor_pv_power, …_pv_voltage
• sensor.axpert_monitor_load_power, …_load_percent
• sensor.axpert_monitor_grid_voltage, …_grid_frequency
• sensor.axpert_monitor_battery_voltage, …_battery_current, …_battery_capacity
• sensor.axpert_monitor_mode (Line, Battery, Fault…)
• sensor.axpert_monitor_pv_energy_today, …_load_energy_today

The energy sensors are compatible with the Energy dashboard.

Automations

• Turn on the water heater when PV power exceeds the load by more than 1 kW.
• Notify when the inverter switches to battery mode because the grid failed.
• Switch off heavy loads when the battery voltage drops near your cut-off.
• Alert on any fault code.

JSON API

GET http://moniwatt.local/api.json?key=YOUR_KEY

{"mode": "Battery", "pv_w": 2140, "pv_v": 312.4,
 "load_w": 860, "load_pct": 15, "grid_v": 0.0,
 "batt_v": 53.1, "batt_chg_a": 22, "batt_dis_a": 0, "batt_pct": 81,
 "temp_c": 41, "warnings": []}