furthermore this calculation method can be applied to estimate additional solar modules and batteries required to charge a larger number of phones it is an interesting economic exercise to compare extra equipment investment with the expected revenue from the charging and communication fees then we described the importance of a webbased information service for the cell phone charging service and presented a design for a solarpowered energyproportional web server cluster to utilize this system in emerging regions we defined two requirements for our system using lowpower and inexpensive devices running on just solar power and being autonomous and scalable starting from a very small village