I’m not a biologist!

i can tell you that based on my testing with deep cycle lead-acid batteries, i get about 50 percent of the power out that i put in

for emergency use (why i have them), that is ok

but to try and run an economy with a 50 percent loss is simply insane

Good question. Should be able to get a guesstimate if your know your KWH charge and the capacity of the batteries in KW. My take is that it will be an availability problem, not cost. In Michigan DTE is already predicting rolling brown outs due to lack of generating capacity. Not enough windmills and solar panels after shutting down coal plants etc.

let's add using the heater in the winter that will take about 50% of the power or more

we even saw this in the movie The Martian
if he had the heaters on, his range of operation was about 1/2

Me dino can't tell you how much it costs to charge an electric vehicle but I can tell you about a next door neighbor who was always charging an electric car when he wasn't driving it.
My brother would laugh at the sight of that car being charged when he'd come over for a visit.
He'd crack jokes about how much coal was being burned at the power plant to charge that car.
One fine day my neighbor replaced his electric car with one with an internal combustion engine.
When I saw him I asked why he traded in his electric car for one that ran on gasoline.
Looking somewhat sheepish, he sighed as he replied, "I wanted something that was more practical."
"I'll bet" is what me dino thought to meself.

I still don't have a reply to my question which was...' Can you drive an electric car through the floods we have here on the Texas Gulf Coast? Betcha that little sucker will have to be bailed out with something fueled with gasoline.

4 hours of your time at a quick charger.
Tesla will charge for free at quick chargers so if you have time to waste, its free. Every time I drive by a quick charger I see someone with their car plugged in and they are waiting… Seems like a terrible inconvenience.