[jray3]

I'll echo MetroMPG about onboard solar, though Via Motors claims up to 10 miles per day of range from their solar tonneau cover, and if you want a tonneau anyway....
VIA Motors SölTRUX Solar Cover Option for Electric VTRUX

I get enough photons to energize my electrons EVen on just moderately sunny days around Seattle. 11-13 kWh of production from my ground-mounted 2.2 kW array provides enough to propel my i-MiEV between 31 and 53 miles per day, depending upon the outside temperature... I average 52 miles of use per day, so this modest array of eight 270 Watt panels has pert near filled the bill. Still in my first year of production, so I am yet to see how it balances out on an annual basis, but will have a second array in production before that first year is up!