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E-paper, great idea. They have tiny solar panels over here that power the led time table displays. I think there needs to be a hefty battery too since the panel
by Gravityloss 3y ago
E-paper, great idea. They have tiny solar panels over here that power the led time table displays. I think there needs to be a hefty battery too since the panel can be under snow for months on a snowy year.
- giuliomagnifico 3y agoSubways? Also on open roads, attach the solar panel is more work an costs, recharge it one time every 3 years could be more convenient for the municipalities.
- Gravityloss 3y agoIn subways one can assume there to be power available. But even there a solar panel can charge from artificial light. In reality the solar panels are more for sparser areas where it would cost a lot more to dig cables.