I think Tesla has the batteries figured out. They are building a giga-factory in Nevada. I don't think they would be doing that without knowing what they are doing. I follow Elon Musk on twitter and he is also talking about solar city and them hitting 5Gwh of daily energy (a record for daily solar). I am hoping he is starting to build solar panels too.
Today - from Elon Musk on twitter - "With all that solar power being generated, it almost feels like something is needed to complete the picture..."
So, I too assume it is a battery for home off-grid use. I am looking forward to not paying the power company anymore - the future.
