One of the demonstration pilots of the Green PE project concerns efficient power conversion systems as an essential prerequisite for smart houses. Implementing power electronics and intelligent control systems, smart houses can maximise energy savings and reduce costs in a significant manner, thus optimising lighting, climate control and other household appliances.
As a part of the pilot on smart houses, five photovoltaic (PV) test stations have been installed on the roof of the Physicum – a building of the Institute of Physics at University of Tartu, one of our project partners. Each test station consists of 12 Amerisolar solar cells of type AS-6P30 with a nominal power of about 270W and provide a module efficiency up to 16.6%. Some of the inverters are based on silicon (Si) others on Siliciumcarbid (SiC) or Gallium nitride (GaN). The use of different materials, opens the possibility to compare the efficiency of both – previous and next generation power electronics. Furthermore, the data of the energy produced in the installed systems will be related with solar light data from the weather station on the roof of the Physicum.
In the second half of 2017, three stations with silicon based inverters were already online. The total solar energy produced was 3.5 MWh.

Energy production example of two days ©Toomas Plank, University of Tartu
Energy production by month ©Toomas Plank, University of Tartu