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New technologies deliver affordable solar energy to the poor in developing countries living outside the power grid.
British scientists have developed an intelligent way to deliver affordable solar energy to the poor in developing countries living outside the power grid.
The Eight19 company from the Cavendish Laboratory at Cambridge University developed solar cells using organic technology based on printed plastics. These batteries are particularly suitable for powering small lamps and cell phone chargers.
Printed plastic solar cell technology is based on the use of a large number of available and low cost organic semiconductors. They have a strong light absorption capacity (100 times that of silicon), absorption spectra can be tuned by chemical compounds, and they precipitate in a dissolved environment, resulting in a lightweight, ultra-thin solar absorber that makes it useful for many other applications (including large-scale power generation) and very promising materials.
Today, researchers combine solar energy with mobile phone service payment technology to create a "recharge" solar service that avoids the high cost of an ordinary solar installation. With the support of the charity Solar Aid, this technology is being tested in Kenya.
More than 1.6 billion people worldwide do not have access to grid power, and the kerosene lighting costs that many rely on are relatively high. For example, a typical Kenyan family who spends only about a month on lighting costs about US$10, which is 1,000 times the amount of money Western countries spend on the same cost. The simultaneous use of kerosene lighting is still dangerous and causes many fatal accidents each year.
The new system, called IndiGo, allows users to obtain lighting in a less costly and safer way, and can also charge their mobile phones by using a calling card.
In addition, it also avoids carbon dioxide emissions and the health problems caused by the burning of kerosene. Although solar lights and cell phone chargers are nothing new, their initial cost has made them inaccessible to many potential users.
The new system includes a low-cost solar panel, a battery pack with a built-in cell phone charger, and a high-efficiency LED light. The user recharges the IndiGo device with the mobile phone card password. The mobile phone card password is authenticated by an ordinary mobile phone via SMS.
Relevant user trials began in Kenya in September 2011 and expanded to Zambia, Malawi and the South Asian subcontinent, and were fully operational and commercialized in early 2012.
Solar Aid CEO Steve Andrews said: “Solar energy provides the world’s poorest people with enormous economic, health and social benefits for lighting and mobile phone charging. The new technology opens these benefits to many people. This is a major breakthrough. â€
Simon Bransfield-Garth, who is responsible for this development work, said: “All renewable energy sources, including wind, solar, or tidal energy, have a problem of high up-front investment. Through a service to provide solar energy, users can directly use fossils. Fuel transition to low-cost, high-performance solar energy."
Samuel Kimani from Kenya Mwiki installed the system at home. He said: “Now I am very happy because this new system has replaced our kerosene lighting. The quality of kerosene lighting is particularly poor, and it will cause a lot of air pollution. I am very happy because I can charge my own home now. "Currently, mobile phone users in Kenya often go a long way to charge their cell phones. (Zhao Xixi)
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