Yes, many have had success with solar chargers. I have not in the past, I think it is because my driveway is North facing, and only gets direct sunlight for a couple of hours a day in the summer, nothing much in winter. My only choice is a mains charger really, or follow the Toyota lock down process. I took the car for a run out today, first reasonable trip for weeks, so hoping the 12V is back up to speed.