Low-Cost Internet Access Using Mechanical Backhaul
Google TechTalks March 22, 2006 S. Keshav University of Waterloo ABSTRACT Rural kiosks in developing countries provide a variety of services such as providing birth and death certificates, land records, and consulting on medical and agricultural problems. Fundamental to a kiosk’s operation is its connection to the Internet for bidirectional information transfer. Network connectivity today is primarily provided by dialup lines, though Very Small Aperture Terminals (VSAT) or long-distance wireless is also being deployed. These solutions tend to be both expensive and failure prone. We propose the use of buses and cars as `mechanical backhaul’ devices to carry data to and from a village and…
www.SolarEnergyGuide.net – How toMake a Homemade Solar Panel Solar panels, unlike before, are cheap and easy to install with great efficiency. With this advent, you can save big money as well as help save the environment. A DIY kit is available and has an easy to follow instruction with them. What you need is some simple tools and you’re done. Here is your guide to make a homemade solar panel 1. First, you must know the loads of your solar panel and the package that is affordable to you. One watt of solar panel module will coast you about and a 200 watts module is around 00. If you need more power, you can connect this to form a collector to produce your desired power needs. Electrical connections are made in series to achieve a desired output voltage and/or in parallel to provide a desired amount of current capability. 2. After selecting the solar panel modules, you need a charge controller which is an important system component that regulates the voltage generated by the solar panel. This will regulate your power and provide protection to the batteries from being over or under-charged. 3. Next, you need a solar inverter this will convert 12 volt DC (direct current) from solar panel to 125 volts AC (alternating current) which will feed your appliances. Some high end inverters combine an inverter, battery charger and dual transfer switch in one package. 4. Batteries are needed if there is no sun or there is a blackout in your area. Typically, lead acid batteries …
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