The State Health Care Centre is the supervisory and asset management institution of hospitals with a public service mission in Hungary. In this function, it is our duty and duty to take all necessary steps to maintain and even increase the level of security and quality of supply. This tender provides the opportunity for our OEP-funded hospitals to reduce overhead costs and to use the funds released to improve the quality of patient care. In the present application, we ask for state support for the photovoltaic system at St. Donát Hospital in Castlepalota. St. Donát Hospital is an institution providing 274 beds with chronic inpatient care (100 beds psychiatric rehabilitation, 15 beds day psychiatric rehabilitation, 30 beds with chronic psychiatric care, 30 beds with hospice healing activities). In the framework of the Castle Palace project, we set the goal of significantly reducing the electricity consumption of the institution. With reverse-watt protection photovoltaic systems in 3 locations (3 buildings) we plan to produce at least 80 % of the 320,000 KWh electric energy consumption by installing a back-watt protective solar panel system. The nominal electrical power of the solar system is 53 kWp for building A, 110.24 kW for building B and 159 kW for parking. The output power of the inverter is 50 kVA for building A, 110kVA for building B, 150kVA for parking. The rated power of Canadian Solar solar panel to be installed is 265 W per panel, so the number of Canadian Solar solar panels you need to install: 200 for the building and 416 for 416 parking places for building B. The solar panels are attached to the established support structure. The system consists of two main parts, Canadian Solar solar module and Growatt inverters. Building A will be connected to the network via 200 pcs 50 kVA, B building 416 pcs 110kVA, Parking 600 pcs 150kVA total power, three-phase Growatt inverters authorised by the service provider and protected by the relevant network connection legislation. The installed and technically supplied system can only be connected to the network with the permission of the power supplier. Solar panels are connected to each other through water and UV standing, standard MC-plug PV-KST/MC-Socket PV-KST connectors. The electrical connections are ventilated in protective channels with UV-resistant direct current lines of appropriate cross-section (not exceeding 1 % voltage drop in specified length), providing enhanced UV and mechanical protection. The wiring shall be designed and fixed in such a way that the wind and other external (snow, ice, etc.) effects cannot cause damage to the wiring or damage to insulation anywhere. When designing a string from solar modules, efforts should be made to bring the voltage of the inverter into the operating range of the inverter even in the case of low intensity solar radiation (~200 W/m²). The inverter manufacturer’s recommendations apply when filling each string with a solar module. The location of the solar panel array (total strings, array) should be primarily solved in the designated area, in case of technical obstacles, the shadow-free array shall be sought. The AC energy converted by the inverters shall be connected to the terminal lock cabinet of the existing feed cable. The system we have prepared complies with the Hungarian standards, the minutes of which are included in the submitted documentation during the handover.