Lithium battery production have been on a strong growth curve for many years and is poised for ten-fold increase development in the near term with support of the current administration and significant venture capital investments across the industry.
According to Gene Berdichevsky, CEO of Sila Nano, and formerly Tesla employee #7, there is currently about 285 GWh of annual production capacity for lithium batteries. He states there is an additional 2000 GWh of production capacity under development that will be complete within the next 5 years. Gene was recently interviewed by Shayle Kann on The Interchange. Sila Nano is itself building a plant that will provide anode materials for up to 100 GWh of lithium batteries annually targeted for the EV market, and sufficient for about one million vehicles per year. https://www.forbes.com/sites/alanohnsman/2021/01/26/sila-nano-hauls-in-590-million-to-make-materials-for-better-electric-car-batteries/
While we recognize there are issues with the procurement of lithium and other materials, there are groups addressing the issues currently, and it appears that the use of electric motors and lithium batteries is currently the best practice for all ground transportation, be it personal vehicles, freight, or rail.
Here at Power Trip and for all of us in Washington State, we are installing batteries, though there is still no economic impetus for batteries in conjunction with your solar array. While the percentage of our clients that initially state they want batteries is increasing, after we conduct an analysis of their energy needs, we usually determine the most sensible path is to install as much solar as possible up to the amount of energy you use, make certain you are using an electric vehicle as much as possible rather than buying and burning gasoline, and make other improvements in energy efficiency and emergency preparedness prior to considering a lithium battery installation.