Good luck, but ...
In the tech and electronic business, we are used to Moore's Law and expect things to improve by a factor of two every two years or so. Unfortunately, progress in lithium ion batteries refuses to follow this trajectory. There is no conspiracy. Research is not being held back by US oil companies, as BIG MONEY is being spent on this in Germany and China, too.
Solar cells keep getting cheaper and cheaper, yet those interested in large
scale generation of solar power are starting to reinvestigate an old idea -
using arrays of mirrors to focus light on containers of sodium, to melt the metal.
Its cooling can be used to generate electricity.
I'm not impressed by the idea of homeowners trying to generate their own
power. Ii reminds me of the old Maoist idea of every village maintaining its own
steel mill. And, what happens when you need a roof job? A $4,000 project turns
into a $15,000 job - that's what.
Yet, sooner or later, a solution to power storage will be found, and therein lies
the rub. If capacity is built to accommodate 30% storage efficiency, there
will be huge excess capacity when storage efficiency reaches 80%.
It's all very frustrating, with multiple moving targets, with the shifting of any
one of them affecting the flows of billions of dollars in investment.