Even the slow mains plug adaptor 3kWhr slow charger is like leaving a kettle boiling all night long to charge your car ignoring economy 7 type tariffs that is about 45pph. So depending how long your charge takes should give an idea.
Some green energy style promoters are stating as they increase in popularity even over night charging would have to be intelligently scheduled to avoid issues. Have a look on fully charged YouTube channel for some examples of some of the smug attitudes by some of these hippy dippies!
Most people talk of one ev per family when commonly most households that could afford an ev would have more than one car. Which would multiply nightly drain.
Most people are selfish in their behaviour when it comes to behavioural patterns, it will take a while to change.