These are not yet approved in Finland, one reason being that older houses might use thinner conductors to wall outlets that cannot handle higher wattages being

These are not yet approved in Finland, one reason being that older houses might use thinner conductors to wall outlets that cannot handle higher wattages being fed from solar. Maybe fuses and circuit breakers can prevent problems, maybe not. I am not an electrician. One fix might be a low ceiling on power output from solar units. Another fix might be to sell solar units that connect _only_ directly into a fusebox, completely bypassing in-wall wiring. And then there is a question of island mode, so that when the power lines are down, and under repair, you don't accidentally electrocute a lineman. OTOH maybe I have no idea what I'm talking about.