Solar Panel Size Guide

Where can I get a solar powered shed light that turns on automatically when the shed door is opened?
This is for a regular sized garden shed, maybe 2m x 3m. I’d like to put a small solar panel on the roof to catch the sunlight. This should charge the batteries in a lighting unit. The batteries do not need to power the light for a long time (maybe 30 minutes). I would like the light to come on automatically when I open the door and go off when I close it again. A mechanical switch fitted to the door would be fine (like in a fridge). A rough price guide would also be useful. Many thanks in advance…
You can buy inexpensive solar chargers for your car usually with a cigarette adapter on the end… cut it off. A 12 volt car battery to connect it to… The light source has to be 12 volt so go to a marine or RV supplier and buy a 12 volt setup of as many lights as you want. Connect the whole mess up and away you go. You should budget about $200 for the whole thing.
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