The Aptera Forum
I think their website's www.aptera.us solar atlas to calculate the MAX solar generation for your region might be you best indicator:
And that would be for a model with full solar
My experience with a grid-tied system at least an order of magnitude larger than what you could put on an Aptera says some days I get better than 50 kwhrs. Some days it's near 0. Same goes with the car. An optimum day will get the max possible for sun exposure, some days it will be negligible.
If you live in a town like Inuvik you will not charge anything from the sun in the several weeks of darkness, so you will need to plug it in during the winter months. You will probably be ok in the spring and autumn, but in the summer you also have several weeks of days wherein you have 24 hours of daylight. On those days you will be charging up a storm! I even wonder if on such days you could potentially charge up to 100 miles per day. I've been in Inuvik in mid summer and the sun doesn't even set for weeks and you have daylight 24/7 and there are kids riding their bikes and playing football at 4 o'clock in the morning! lol