Hi!
The popular solar energy solution SunenergyXT (former Sunlit) has released an API (see Github link below) for their solar battery solution. (originally for Home assistant but may be useful here as well)
Sunenergy XT offers a full solar energy solution incl. Battery, inverter and car charger while it works with Shelly Pro 3EM to manage a 0 to grid strategy.
Maybe an Integration for Homey pro would be possible?
API Documentation:
API Home Assistant Integration Documentation