A lot of people are understandably focused on how little range you’ll get from even an all-day session out in the sun, but there’s a cost angle, too. If you can’t charge at home, then relying on public chargers can be pricey. Those near me charge anywhere from $.35 to $.99 per kWh (US). With 1100w capacity under ideal conditions, I think around 2kWh per day in Canada. That’s maybe 8 miles per day of range for the most efficient Tesla Model 3, but $1 to $2 per day of charging replaced. At that system cost, assuming daily charging, payback is in 6.8 years, in a best-case scenario.

I built a small 1.8 kWh (4 panels) system that takes up a patio shade structure, with a 5 kWh battery as a buffer, but that could be cut down to make the cost lower. With similar panels going for as low as $82 US as I type this, plus inverter and battery cost, you could build a small fixed system that pays for itself in as little as a year or two.