House Hold Energy Useage: Your house is serviced by three-phase 208 V ac, and the main breaker is typically rated at 100 amperes (electical current). The typical household uses around 80 percent of this power rating: S = 1.73*208*100*0.8 VA = 28821 VA = 28.8 k VA. With a typically efficiency of, say 0.9, the real power is P = 0.9*28.8 k VA = 25.92 kW. Over one day (24 hours) if you continuously use energy at this rate, the total energy usage would be E = 25.92 kW*24 hours = 622 kW-h.
If you relied on total solar conversion, the above figure (energy) is what the solar unit and converter would have to produce, after heat losses. 100 percent conversion efficiency is not possible because of the second law of thermodynamics. The level of energy needed is the same, regardless of how the energy is produced, or its source.
