For those who are looking at getting off the grid or reducing their electric bill, take a look at the Tesla Powerwall ($3000). The old technology required a large bank of batteries to store the energy for later use at night. Tesla has a battery (51.2"H x 33.9"W x 7.1 deep. A solar PV panel system would supply the power. Last Oct, I have a 2.5kWh 10 panel system for $18,000. The last three months, the bill was ZERO and had an energy credit for this year.
Young families might want to look at the system. Over the long run it could save quite a bit of money.