Onyx solar offers a completely free-of-charge Photovoltaic Estimation App.
Enter the value for the photovoltaic installation area you have in mind, select the photovoltaic technology, and it will display the energy that would be generated and its equivalencies in avoided CO2 emissions, hours of light and electric car mileage. Use the screen of your smartphone to simulate the active surface of the photovoltaic glass, and just place it in the same position that your installation would be.The results will change depending on inclination and rotation of the device.