Hi everyone,
I wanted PV surplus charging for my Juice Booster Easy / Juice CHARGER Easy
installation without replacing the whole charger, so I built an unofficial
Raspberry Pi based software modification that integrates it with Home Assistant
through MQTT.
What it does:
- publishes Home Assistant MQTT Discovery entities
- provides a local web dashboard
- supports off, instant and PV surplus modes
- reads grid import/export power from Home Assistant
- calculates PV surplus charging current locally
- keeps the existing hardware current selector and RLC limits active
- reports CP state, vehicle connected, effective current, target current,
FreeCharge override and stale PV data
Hardware:
- Raspberry Pi (of the Juice Charger Easy; already part of the system)
including:- MCP41xxx digital potentiometer, tested around MCP4161 behavior
- Juice Booster Easy / Juice CHARGER Easy control board
- GPIO/SPI wiring for CP state, current selector, DIP switches and RLC inputs
Home Assistant sees the charger as an MQTT Discovery device with a mode select,
instant-current control, current/power sensors and binary sensors.
GitHub:
Screenshots:
I would be happy to get feedback from other Home Assistant users, especially
people with Juice Booster Easy hardware, RCT Power installations, or similar PV
surplus charging setups.