On December 8, 2005, dot-EDU set up a low-cost, low-energy using lab in rural Uganda that may be just the solution for places where electrical problems (surges, brief cuts, and brownouts) tend to damage ICT equipment. At Bulera Primary Teachers College, four hours northwest of Kampala, the staff began to set up a hybrid system that uses both 12-volt direct current (DC) as well as standard AC from the mains. Eventually, it will shift over to become a ten-work-station lab that is entirely run off of 12-volt. There are further plans to have the lab run on boda power if the main electrical system is down for a long time. (A boda is a motorbike used in many rural places; a litre of petrol about $1 usd -- and a simple roller device -- can allow the motorbike to charge the battery system enough to run the lab for hours.)
Using Thin Clients & Low Energy LCD Monitors........
A key part of this lab is the use of low-energy, low-cost thin client devices rather than regular desk-top PCs, which use much more power. In this case, the team chose to use Wyse terminals, which are about eight inches tall and two inches wide. These terminals have no moving parts, no fans, and cost well under $300 US dollars, yet when connected to a server have all the ports and capabilities of modern PCs.
With the help of a company in Kampala called Ultratec, the thin-client devices were adapted so that they run on 12-volt DC instead of using 220 to 240 AC power cords. Ultratec also supplied a battery back-up system that allowed some equipment, such as the server (a low-cost Dell desktop in this case) and a laser printer, to run on AC; an inverter changes the 12-volt back to AC. The battery back-up system takes power from the mains and provides a stable 12-volt system, even when the mains is not working.
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