Efficient solar cooking that stores heat in sand

Move over solar ovens—this Ghana high school just cooked rice, beans, and plantain using sun power stored in sand, hitting steamy temps of 105–110°C and claiming higher efficiency than classic mirror-dish setups. The system cuts long-term costs by nearly half and pays back in about 4.5 years, which sounds great… unless you’re in the “this is just a glorified electric cooker” camp. One loud chorus, led by Legend2440, grumbles that there’s nothing magical here: it’s pan + panel = steam, period. On the other side, pragmatists cheer the simplicity and battery-free vibes, with DIYers chiming in that a stove coil straight to a panel already works, and that panel prices make the math tempting—see this video. History buffs waved receipts, pointing to Cal Poly’s 2015 prototype, arguing this is evolution, not revolution. Then came the dreamers: one commenter fantasized about heat-storing deserts distilling fresh water at night, spawning memes like “beach kitchen” and “sand-as-sous-chef.” A spicy subplot: infinet says the paper compares against a worst-case wood stove, yet still warms to the idea—scale it up, add panels, add sand, done. Verdict from the crowd? Not flashy, but quietly game-changing if it cooks a lot of meals without smoke and without batteries.