Kalkener.com is an online calculator designed to work out the optimal tilt and orientation for solar panels on pitched roofs. \r\nIt is free, requires no registration, is user-friendly, and is available worldwide.\r\nNo complex 3D models are needed. Kalkener.com calculates the following in just a few clicks:\r\n How to position solar panels on any pitched roof to maximize solar radiation.\r\n The energy losses resulting from orientation and tilt if the panels are not placed in the optimal position.\r\n Shading losses, once the user has identified the surrounding obstacles.