I'm sure you're right - many years ago I had a solar phone charger. Albeit was a cheap one, it would hardly get any charge into itself, let alone a phone, in the limited solar we have here.
Having said that there are mat ones which you put on the dash.rear shelf which I'm pretty sure some over here use when leaving the car for a while.
Halfords have one which they call a maintainer. I don't imagine they'd stock it if it were useless.
www.halfords.com/motoring/battery-maintenance/battery-accessories/12v-6-watt-solar-maintainer---upto-200ah-196489.html
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