IndiGo is best thought of as “pay as you go” solar power.
Each IndiGo power unit has a unique serial number. To add credit to the unit, the user purchases a scratch card for a period of time such as a day, a week or a month. This scratchcard number, along with the unit serial number, is sent by SMS text message to the IndiGo server which validates the number and sends back a unique passcode. The user enters this passcode into the unit and the output is enabled for the period of the credit.
IndiGo works with any mobile phone and any mobile operator. The system enables products such as high quality solar lighting, mobile charging and other low power uses of solar energy.
Download an overview of the problem
the IndiGo solution
