Patent ID: 7800247
Filing Date: 2010-09-21
Classification: H02J,Y02B,Y02E

Abstract:
1. An energy storage system, comprising a plurality of battery modules, electrically connected in parallel, each plurality of battery modules having an inverter electrically connected thereto to form a plurality of battery modules and inverter combination, the inverter having an AC output connected to one or more energy consuming devices and an AC input connected to a power grid, each battery module of said plurality of battery modules having electrical properties similar to the remaining battery modules, and each of the battery module having a maximum power output rating equal to or greater than a continuous maximum output power rating of the inverter, wherein the plurality of battery modules and inverter combination is controlled to be in one of system control modes, said system control modes comprising: 1) an over-charge mode, wherein if a voltage detected from said battery module V is >a sustainable high voltage limit V 2) an over-discharge mode, wherein if V<a preset voltage V 3) a recharge mode, wherein if V<a preset voltage V″ and if the time of day T is within a preset range R, then the plurality of battery modules is recharged from the inverter AC input connected to the power grid; and 4) a normal operating mode, wherein if V is V