The Bolt should get about 3.5 miles per kWhr so 10 kWhrs per day should get you about 13,000 miles per year with zero dino juice.
I am going to add to my solar array (currently at 12.7 kW) with another couple strings to allow that. My electric coop limits me to a 25 kW peak system so I can't go too crazy.
The last panels, inverters, trunk cable, wiring and mounting hardware came out to ~ $1.1 per watt and I anticipate the Enphase M215's being phased out this next summer.
Panels are about $0.60 - $0.80 a watt, but buys can be found at less that that, but you have to perhaps buy 100.
Reducing the inverter to $50 (from the $90 price now) may tempt me earlier. I still have lots of roof space (more than half is open) so I can easily double my array - but economic laws tell me to not do too much.
Cloudy, cold and windy day here with the array barely spitting out electrons . . .
Here is a sweet deal from Renvu for a 335 W panel (72) cells for $0.49 a watt!!
RENVU Specials
Steve