This work will explain to us the work of a self-sustaining house that is real and exists. It is very good that it is not someone else's house, but an existing house that we are renovating independently and in stages into a self-sustainable one. Our primary goal is to clarify all the elements and systems that are being installed, and we need them to reach the final result. This is how we will describe solar panels, batteries, controllers, smart devices and switches, solar heaters... In the end, we will connect them all into one unique system through a central computer. The survey is also very important to us, through which we will find out the interest and familiarity of our respondents. We are interested in how environmentally aware people are and how much their desire is to be energy independent. Unfortunately, in Croatia it is not yet so widespread, because people have a harder time accepting new technologies and trends. Some people do not at all understand how solar energy, or light, can be converted into 240V alternating energy that can power our house, so it is not uncommon for them not to believe in such systems. At the end, when we get all this information and work out the topic to the end, we can draw a conclusion. The conclusion is very important because it tells us whether it is even worth it to embark on such large projects and whether we have succeeded in getting people interested in renewable energy sources. This diploma thesis strives for that, to try with a real example to encourage people to convert their homes into self-sustainable and smart ones.