Abstract: The electrification and DC of residential buildings is an important support for the realization of renewable energy consumption in residential buildings, as well as a breakthrough point in building green ecological civilization construction and economic and social development.At present, there is no mature product or experience of DC energy storage type at home and abroad. The household energy management system also needs technological breakthroughs urgently. In view of the above problems, a set of household energy monitoring and management platform based on Photovoltaic Energy Storage Direct Current Flexibility（PEDF） technology has been researched and designed to verify the authenticity and accuracy of power saving in the energy management system.The designed energy management system improves the user experience and provides an efficient and stable energy management solution for the smart home industry.The research provides valuable reference for further improving and promoting the design of DC residential products.

Key words: Photovoltaic energy storage direct current flexibility（PEDF）, DC household appliances, DC residential, Home energy management, Electric energy data acquisition