Greetings EEVBees:
--See below an attempted demonstration of an early one off attempt at the Multi Battery Electric Car by noted designer Virgil Heisenberg Simms a distant cousin of Elon Musk. Notice that this particular design is so primitive that it retains the use of an an old style electronic starter, making it a kind of missing link between the ICE Vehicle and modern Electric Vehicles.
Musk may already have a customer to buy his batteries lined up, his cousin Lyndon Rive CEO of Solar City in NY.
http://www.notimpossiblenow.com/the-latest/solar-city-teslaSolar city plans to build some larger fabs to produce Rooftop PV Systems which will all include backup using Musk batteries.
http://cleantechnica.com/2014/09/22/every-solarcity-customer-will-get-battery-backup-within-5-10-years/Supposedly Solar City also has plans to finance customer purchases allowing the customer and not the company to receive any and all government subsidies and tax credits. Like Judy Tenuda said: "It could happen".
"A three legged dog walks into a bar and says I am looking for the guy who shot my paw."
James Albert "Jim" Varney Jr. 1949 - 2000