7kW sounds low to me, no one around goes under 10kW, with 12-15 being typical. That said I never heard about home connection over 30kW. Power company charges monthly for available power, so no one goes with huge 3phase connection just in case they might need it.
Spain here: everybody around me gets surprised when I say I have 6,5kW installed, they think is crazy high. A quick google search tells me our average is between 3,45kW and 4,6kW.
