Guardian: When South Africa’s government started giving laptops to off-grid schools, James van der Walt spotted an opportunity for a solar business. But his market research revealed a problem: of 12 schools he visited, 11 had previously lost solar panels to thieves. So he decided to pack his system into a reinforced shipping container, creating a secure, mobile power station that could be shut away at the end of each day.
The prototype Solar Turtle has survived its first year powering a school in the Eastern…

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