Prototype Measurement System: To better understand how energy is generated and consumed in homes powered by renewable sources, we have deployed the first version of a measurement system in an off-grid home in Arkansas. We collect the instantaneous residual battery voltage (in Volts) and the energy consumed by the house (in KWh). We have also deployed networked, off-the-shelf WattsUp meters to measure power consumption of the television and refrigerator in the home. Analysis of the data suggests the following:
Recommendation System and Smartphone Application: We are developing a recommendation-based system that uses information collected by the measurement system to provides users with advice regarding energy consumption, including warnings in advance of critical battery situations, recommendations for the best times to execute high-power tasks such as running a clothes dryer, and opportunities to adjust the power states of devices to reduce energy consumption. We have chosen a recommendation-based model to minimize user irritation and ensure that control of household appliances ultimately resides with the user. A smartphone application notifies the user when the system suggests changes to the power states of devices, for example suggests that the user turn an appliance on. The user is responsible for implementing the suggestion, and control of some devices is supported via the smartphone application.