Solutions

Documents describing a Raspberry PI based home automation solution - Documents for free download without guarantee by or liability of the author

Surplus power charging of EV via ABL eMH1 wallbox

Charge current set point as function of actual PV power supply and home power demand.
Limitation of charge current to protect tarife fuse
Switching of single phase and tripple phase charging to minimize power drain to grid.
Communication with Wallbox ABL eMH1 via RS 485 and MODBUS ASCII
Communication with Inverter Huawei SUN 2000 6TKL via MODBUS TCP
Power measurement with current transducers and Raspberry Pi 8 channel A/D converter
On/Off control and switching of phase count (single/tripple phase charging) with AC contactors and relais board

In the lines at the bottom of the picture:

the remaining PV yield from the day and the next day
the daily procurement costs and feed-in yields as well as the average prices including grid fees and taxes
the current purchase- and feed-in prices including grid fees and taxes, as well as the current price level between the most expensive and cheapest tariff of the day.

The sliders indicate:

The green bars show the net electricity price for each hour
The light blue bars the electricity price with taxes and grid fees (gross price)
The dark blue bars show the gross price devalued by the ratio (PV output/
average power requirement of the HP), this variable (HP price) is used
to control the HP (increase/decrease of the flow temperature in relation
to the current HP price to the daily average of the WP price;

Car charging options:

Usage of home battery:

Schematic

Raspberry Python Script