This is an easy-to-make ionic liquid or deep eutectic solvent that I've made. Basically it's Epsom salt (magnesium sulfate heptahydrate) and glycerin/glycerol in a 1:3 molar ratio.
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.
The most difficult problem with off-grid living, solar, and wind power systems is the batteries. Traditional lead batteries are cheap but low quality and die quickly in the cold. What if a battery existed that could run for 100 years, run in any kind
Some Tesla observers are convinced that it will be a battery, based on the design that powers the company's automobiles, yet large enough to keep the lights on at a home.