Petra Inventum is a company that develops sustainable and ecological building innovations, including their Solar Item product. Solar Item is a stainless steel solar panel that functions as a roof and captures thermal solar energy to provide heating and hot water, increasing a building's value. It allows users to become energy independent and save money while protecting the environment. Customers can trust Solar Item due to its reliable stainless steel construction, long lifespan with low maintenance costs, and Petra Inventum's installation and after-sales support services. The key advantages of Solar Item are that it is cheaper than separate roofing and solar panels, aesthetically integrated, stands up to all temperatures, and is easy to install with minimum later maintenance needed.