RESU is an energy storage solution for households by LG Chem. With its lithium-ion battery cells, RESU offers backup power capacity for nighttime usage, thus allowing solar PV households to generate and consume self-sufficient power on their own terms. With its varying capacity, between 2.9 kWh and 9.5 kWh (net), customers can choose between several sizes according to their energy needs. LG Chem also offers expansion modules that maximize the storage capacity of particular models. The residential storage system has a guaranteed life expectancy of 6,000 cycles or 10 years.