Self-sufficiency ratio: an insufficient metric for domestic PV-battery systems?

摘要

By installing a home battery to accompany rooftop solar PV,grid electricity usage is reduced and self-sufficiency increased.One motivation for pursuing this goal is environmental concern.By modelling domestic PV-battery systems in this work,self-sufficiency is found not to correlate well with CO2 emissions savings,in some cases even correlating negatively.A system's complexities,such as transmission and distribution losses,are not encapsulated in self-sufficiency.Self-sufficiency should not be considered in isolation when designing PV-battery systems to maximize CO2 emissions savings.