The battery needs to charge
I recently watched "The Boy Who Harnessed the Wind". It's a film based on the life of William Kamkwamba, a schoolboy in Malawi. He's a keen student in his village school in the town of Wimbe, and spends his time tinkering and repairing radios and other gadgets. In the early-2000s, Malawi suffers from a famine due to a combination of flooding, followed by drought. Things get desperate, resulting in theft, riots, and William's sister even leaves the family to find a new life elsewhere. William comes upon the idea of building a makeshift windmill. If they can generate electricity, they can pump a stream of water up from the well. If they can get a stream of water going, then they can irrigate their fields, and won't be entirely dependent on rain. After much persuasion, he finally convinces his father to break their one precious bicycle into parts, so that they can be used to construct the windmill. I found the scene where they build the windmill quite moving. ...