I still don't see how these systems can provide enough power for today's typical US home.
Is this an "off-the-grid" installation? If not, then it doesn't have to supply all the power, as the POCO will provide the rest. Typically, the POCO also buys back excess power during peak generation times.
If it is off the grid (no POCO connection), I think it is generally done with lots of power conservation (ultra-efficient lighting and appliances along with lifestyle adjustments to reduce energy use even more). Heating and hot water may be provided by a separate solar system.
