Sizing of PV panel, wind turbine and storage batteries in hybrid energy systems is the most important research topic for a system design. There are many studies in the literature, using different approaches about sizing of hybrid renewable energy systems. In this study, experimental and simulation performance differences of the installed hybrid system are presented. The system that is installed in Yildiz Technical University, has 600 W wind turbine, 2x320 W photovoltaic (PV) panel group and 4x210 Ah batteries. A maximum power point tracking (MPPT) controller, a hybrid controller and an inverter are utilized to control the panels, wind turbine and power flow. A weather station is used to measure the weather conditions such as wind speed, temperature, radiation, and electrical quantities are recorded by a data logger. The system is modelled depending on the datasheets of the components, and the modelling results are compared with experimental results.