Solar generation data is collected via current transformers and is direct from the inverters.
Home load is collected the same way and adjusted for an extra 280w from the battery inverter.
Red cells are currently balancing.

Battery Management System is a moderately modified version of Collin's reverse engineered TeslaBMS code. Check out my fork here.

Storage system is 48 Tesla batteries from an 85kWh car at 5.3kWh each.