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Study on Cost Evaluation of DC Smart Houses

Smart house, which is installed on-site distributed generators like photovoltaics and batteries and manages their own energy usage by using information technology, is studied and developed all over the world. Most of facilities in a smart house are operated in DC systems; however, conventional supply systems are AC. In addition, electric vehicles which also need DC power have been increasing in residential side. Therefore, a DC power supply system for smart houses can be reduce the number of power converters, conversion losses and electric charge. Initial and running costs of DC-based smart houses and AC-based one are calculated in several conditions in this paper. In conclusion, DC-based smart houses require lower costs than AC-based one regardless of AC/DC ratio in load and uses of EV.