Estimation of Self-Sufficiency Rate in Detached Houses Using Home Energy Management System Data

Japan’s energy consumption in 2018 was about 2.5 times that 1975, with the increase household sector being largest at 28%. Most of primary is still fossil fuel, and it urgent to reduce sector. The purpose this paper identify ways without compromising quality life residence. However, reduction methods vary by region, building specifications, type, equipment season, weather. value based on a systematic analysis home management systems (HEMS) data from 50,000 households under various conditions. We are analyzing consumption. Few studies have analyzed much back-up data, which likely lead CO2 emissions across To explore sector, company has introduced provided services for since 2011 currently collecting HEMS up households. In order grasp actual state each household, systematically analyzed, necessary conditions self-sufficiency rate (SSR) improvement certain estimated using storage batteries (SB) heat pump water heaters (HPWH). addition, investigated measurement simulation several hundred Since power generation greatly depending weather, etc., analyze these factors systematically. As conclusion, improve SSR, (1) surplus (HPWHs), (2) solar generation, (3) size SB. This study contributes spread advanced housing