I have a small panel like that I flap over my backback when im taking my outdoor summer walks.. it keeps my phone charged while its in my pocket.. sicne I often track my city coffee-shop tour walks with my phone its really nice to have.. a slightly bigger panel with 12 volts stuck in the windshield of your bus while its parked in the sun will keep the battery up so it will start easy when you want to drive... I have a nice folder panel thats like a briefcase i stick in the windshield if im going to be parked for extended times..
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