The solar attached to the rear motor of the truck. Once the solar combine with the sun energy, the truck move, sometime its doesn't move because of not enough energy.
You can just attach a solar panel to any device that have battery, for example clock or digital watch that use AA battery,just attach the solar panel positive to the positive battery placement and same goes to the negative, an innovation:
Solar panel disambungkan ke jam untuk menggerakkannya. Untuk inovasi yang lebih mengagumkan ialah dengan meletakkan rechargeable bateri bersama dengan suis atau sensor cahaya, pagi solar panel charge bateri sambil menggerakkan jam, malam jam bergerak menggunakan elektrik yang telah disimpan pada bateri.
Here is solar on LED with rotating solar underneath :
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