Stand-Alone Renewable-Energy Generating Device Including Emission Savings Sensor, Retrofit Emissions Savings Sensor for such a Device, and Method

The invention relates to a stand-alone renewable-energy generating device which generates electric energy from renewable energy sources, such as the sun or wind, in a stand-alone context, i.e. without being connected to a power grid. To allow users to asses their contribution to carbon dioxide emission savings, the invention provides a sensor element that is adapted to generate emission savings data representative of electric energy units generated by using a renewable energy device. Further, a clock device is comprised that is adapted to generate a time data representative of at least one of a time and a date specification and unique sensor-ID data are stored in a memory. A processor unit is adapted to time-stamp the emission savings data by combining it with the time data. The processor unit retrieves the sensor-ID data to combine them with the emission savings data to form savings profile data. A communication interface is adapted to communicate the savings profile data directly or indirectly via a network system. The sensor element may be provided integrated in a stand-alone renewable-energy generating device or in a separate emission savings sensor. The invention also relates to a method of maintaining user data associated with a savings profile data and sharing the savings profile data on the communications network. The sharing of these data aims to motivate further use of renewable energy devices.