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How many Northumbrian batteries would be needed to store and retrieve 20 kWh per day for 4 days (96 h) for PhotoNorth photovoltaic svstem. The depth of charge of a typical Sunder battery is 80% after 600 cycles. Each Northumbrian battery provides nominally 265 A h and weighs 75 KgTable 1.3 Battery characteristics 12 Battery characteristics Definition Open-circuit voltage Maximum voltage in the chargedVo Unit lt (V) state at zero current Low currents are characterized by activation losses, while the maximum current is normally determined by mass transfer limitations Current Am pere (A) The energy that can be derived per unit volume of the weight of the cell Watt-hours per liter (Wh/dm) Energy density The energy that can be derived per Wtt-hours per kilogram unit weight of the cell (or sometimes (Wh/kg) per unit weight of the active electrode material) Specific energy density Power density The power that can be derived per unit weight of the cell Watt per kilogram (W/kg) Capacity The theoretical capacity of a battery Ampere-hours per gram is the quantity of electricity involved(Ah/g) in the electrochemical reaction Shelf-life The time a battery can be stored inactive before its capacity falls to 80% Years Service life The time a battery can be used at various loads and temperatures Hours (usually normalized for ampere per kilogram (A/kg) and ampere per liter (A/lt) Cycles Cycle life The number of discharge/charge cycles it can undergo before its capacity falls to 80%

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