BSLBATT in Home Assistant

How it connects

Add your MQTT broker address and credentials in MoniWatt for BSLBATT. Home Assistant discovers the device and creates the sensors automatically.

Sensors

• sensor.bslbatt_monitor_soc, …_soh
• sensor.bslbatt_monitor_power, …_voltage, …_current
• sensor.bslbatt_monitor_cell_min, …_cell_max, …_cell_delta
• sensor.bslbatt_monitor_temperature
• binary_sensor.bslbatt_monitor_alarm

Why read the battery and not only the inverter?

Victron, SMA and other inverters already expose a battery SOC to Home Assistant. That figure is what the battery sent to the inverter. MoniWatt for BSLBATT adds what the inverter never forwards: cell voltages, temperatures inside the pack, health and the battery’s own alarms.

Automation ideas

• Charge the EV only when the house battery is above 80%.
• Warn if the cell delta keeps growing over a month.
• Lower heating in the technical room when the battery runs warm in summer.

JSON API

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

{"soc": 81, "soh": 98, "power": 1240, "voltage": 53.4,
 "cell_min": 3.334, "cell_max": 3.341, "temp": 24.0, "alarms": []}