Energy management system

A really usefull feature would be a kind of a energy management system for heaters, EV-chargeing and other switchable loads in combination with a Photovoltaik system (or maybe variable power prices).

Certainly +1

a prepackaged addition to the HA Energy Management system would be perfect, but it is all achievable via automations, that should be suited to your use case.
One compregensive example is presented in this video youtube