I have just wrestled automations for load balancing e-go charger. It is cheap (about 650€), 3 phase 16A or 32A depending model.
I dont have solar system, but i have only 3x25A main fuse, so i must balance load to keep total current under that.
I just posted my automation here, and results look like this. Blue is charging current, red is total mains current (for only phase, in this case 2 phases are below that, so i left them out of graph). Target max current in automation linked is between 19 and 22A.
Edit. For solar use it is possible to change between 1 phase and 3 phase on mqtt. If your solar system is only on one phase that could be useful.
