Sib - seems to me that you're not truly looking for "just information" by the way you're phrasing it. You've already said solar won't work for you because of snow or fog or clouds. That's OK; I already said it won't work for everyone. You don't seem interested in an electric car but you seem interested in the argument. Nothing wrong with that.
Did I say right now? No. This emerging tech and I said 5-10 years. See, e.g. http://cleantechnica.com/2014/09/22/every-solarcity-customer-will-get-battery-backup-within-5-10-years/
. What will it cost then?
This seems reasonable to me; not science fiction. (BTW, for example, the company located below mine just got $50 million 2nd or 3rd level financing to develop batteries - which just means people are interested and tossing $$ at these issues)
Even with a $40K BMW I3, it might cost less to own right now than a $30K combustion car over the course of 10-15.years. The cars are still too new to compare apples to apples. Seems like a good bet that the electrics will be better in 5-10 years. They're certainly better now than 5-10 years ago. We'll know more in 5 years. Will cost less too.
Just to mess around, and to answer your question, we could look at some examples. Ex: $50/mo on electric charging is one estimate I've received. That's $600/year. I spend about $3k a year in gas right now driving 15K miles. Over 10 years that's a $24,000 difference plus interest. Let's call it an even $30,000 over 10 years just in energy savings.
I have a 9 year old car that I'll keep another 5-6 years. I probably spend $1200 a year in maintenance and repairs. I imagine that would be cut in half. That's another $6000 over 10 years, plus interest, and let's call it $8000.
Also, I live/work in an urban area and I would save time by using HOV lanes. If I save 2 hours a week (12 mins each way x 10) at $250/hour that's $500/week or $23,000 additional revenue potential (46 weeks x $500).
Just those 3 items are $61,000. Even if that is cut in half, it's $30K. Is $3000/year over 10 years significant? It is for some people- that's a cat trip.
Currently, there are more details emerging. For example, Tesla has a deal with Solar City right now. http://gas2.org/2014/10/01/future-tesla-vehicles-come-free-home-charging/
Such deals probably reduce costs or make necessary pieces more available. Might increase competition.
There are also a lot of variables because some people don't negotiate well for cars and related costs (or even think them through).It might cost more for some items or they might throw it in; or they might give you better financing or a better trade in; or they might give you free maintenance or a better and longer warranty.
These costs are not readily transparent by looking at sticker prices. Does anyone pay MSRP anymore? Do people buy or lease? Are you writing off the lease? If so, what's the out of pocket? Do people shop financing rates? Maybe you can get 0% on a VW Golf TDI or 3% on a Mazda 3 - over the life of the car which one will cost you more? If you want a certain car you can research it yourself, but there are a lot of variables
I think the prospects for electric cars are intriguing. I'm betting I'll get one in the next 5-6 years.