In March, 2017, Elon Musk made a bet guaranteeing the installation of 100+ MWH battery for Australia within 100 days of signing, or he would supply it for free. This would have cost Elon Musk over $50 million.

The 129-megawatt-hour battery was being built by Musk for South Australia, which generates a substantial percentage of its energy from wind power and it was just completed before the 100 days expired from the September contract signing.

The US uses about 11.2 billion kwh per day.

If there was sufficient battery storage to cover about 10 hours then solar could supply power during daylight hours and the 10 hours of storage would cover the dark hours.

5 billion kwh would be storage for energy shifting massive solar for the USA.
This would be about 38,800 times more than the South Australia facility.
At the $50 million fully installed price would scale to 1.94 trillion for complete power shifting for the USA.

The gigafactory will cost Tesla up to $5 billion to build. It will produce 35 GWh/yr in battery cells and 50 GWh/yr in battery packs. Expansion plans are targeting 105 GWh of annual capacity by 2020.