On-Grid/Off-Grid Photovoltaic-Wind Power Plant Trainer System configuration: Stand-alone (isolated from the grid) or Grid-connected The system should consist of: Silicon cell photovoltaic panel: Solar radiation and PV panel temperature sensor Horizontal axis wind power generator: Wind speed sensor Table top control panel for OFF-GRID operation including charge regulator, DC electric load (lamp), Electric instrumentation for detecting the energy flows in the circuit branches and PC data acquisition system Buffer battery Table top control panel for ON-GRID operation including Grid-Tie Inverter, AC electric load, Electric instrumentation for detecting the energy flows in the circuit branches and PC data acquisition system OFF-GRID operation: In case there is no sunshine or wind blowing, all the energy consumed by the user (load) is to be taken from the battery In case there is sunshine and/or wind blowing but no load is connected, all the energy produced by the system should charge the battery In case there are both sunshine and/or wind blowing and load, the energy produced by the system partially should charge the battery and partially power the load When the consumption is higher than the power available from the sun and the wind, the power surplus should be given by the battery ON-GRID operation: In case the user consumption is lower than the available energy from sun and/or wind, the excess power should be fed to the grid 19 On the contrary, when consumption is higher than the available energy, the additionally required energy should be supplied by the grid.