Compared with other ways to store electricity, FES systems have long lifetimes (lasting decades with little or no maintenance; full-cycle lifetimes quoted for flywheels range from in excess of 10 , up to 10 , cycles of use), high (100–130 W·h/kg, or 360–500 kJ/kg), and large maximum power output. The (ratio of energy out per energy in) of flywheels, also known as round-trip efficiency, can be as high as 90%. Typical capacities range from 3 to 1.
[pdf] The system consists of a 40KWH Powerbrick lithium battery, a 16KVA off-grid hybrid inverter, and GSL PV solar panels, designed to meet the energy demands of a larger home while promoting energy independence.
[pdf] Peak shaving refers to reducing electricity consumption during periods of peak demand when utility rates are highest. Energy storage systems play a crucial role by storing electricity during off-peak hours and discharging it during peak times, helping businesses avoid expensive demand charges.
[pdf] 
