Solar Lanterns Transform Lives in Malawi, Africa
Posted by keelynet on May 8, 2008
Such a cool thing and I love that they build it themselves using locally available materials!
“The average African household uses 55 or so liters of kerosene per year, at an approximate cost of £80 [US $158]. This contributes to health problems as the burning of kerosene inside houses is a major cause of respiratory illness, fires, burns, accidental poisonings, eyesight problems and death in the developing world. Kerosene is far more expensive and far less efficient than electric lighting: the cost of useful light energy ($/lumen hour of light) for kerosene is 325 times higher than the inefficient incandescent bulb and 1,625 times higher than compact fluorescent light bulbs. The training that SolarAid is doing involves teaching your Malawians to convert a standard, medium sized kerosene “hurricane” lanterns (not pressurized or “tilly” lanterns) into LED solar lanterns. Conversion of the lanterns involves putting rechargeable AA batteries into the chimney and using 3.3V, 25mA LEDs (wired in parallel) to direct light down onto an improvised cone reflector, which sits over the top of the old wick. The reflector is constructed from locally collected materials such as aluminium foil, gift wrap, or the inside of a cigarette packet, and is configured in a conical shape to provide uniform reflection. The torches are guaranteed for three years. Batteries are designed to be recharged up to 1000 times without “memory effect.” SolarAid tests have shown a solar LED lantern can go for up to 10 days non-stop on a single battery charge, meaning the batteries could last 20 years or more if only used once a week. The batteries are recharged with one-watt solar panels, which are made locally with imported amorphous silicon and wooden frames. The PV panels do not degrade over time and are sold in the West with at least a 10-year warranty. All other components can be replaced when needed as they are sourced locally.” - Source


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Check out the article which tells you how to build or buy your own to experiment with. Reported to boost energy levels.