IEEE 1013-2000 pdf download IEEE Recommended Practice for Sizing Lead-Acid Batteries for Photovoltaic (PV) Systems
3. Definitions
The following definitions apply specifically to this recommended practice. For other definitions, see TheAuthoritative Dictionary ofIEEE Standards Terms, Seventh Edition (B1l.-
3.1 array-to-load ratio: The array-to-load ratio is the average photovoltaic ampere hours available divided bythe average daily load in ampere hours (Ah). The average daily PV ampere hours is calculated by taking theaverage daily solar resource for the month of interest in kilowatt hours per square meter (kWh/m’) times thearray current at its maximum power point under a solar irradiance of 1000 watts per square meter (W/m-).
3.2 cycle life: The number of cycles (discharges and recharges), under specified conditions, that a batterycan undergo before failing to meet its specified end-of-life capacity.
3.3 days of battery reserve: The number of days a fully charged battery can satisfy the load with no contri-bution from the photovoltaic array or auxiliary power source.
3.4 depth of discharge (DOD): The ampere hours removed from a fully charged battery, expressed as a percentage of its rated capacity at the applicable discharge rate.
3.5 discharge rate: The rate, in amperes, at which current is delivered by a battery. See also: hour rate
3.6 energy capacity: The energy, usually expressed in watt hours (Wh), that a fully charged battery candeliver under specified conditions.
3.7 hour rate: The discharge rate of a battery expressed in terms of the length of time a fully charged batterycan be discharged at a specific current before reaching a specified end-of-discharge voltage.
3.8 rated capacity (C): The capacity, in ampere hours (Ah), assigned to a cell by its manufacturer for agiven constant-current discharge rate, with a given discharge time, at a specified electrolyte temperature andspecific gravity,to a specific end-of-discharge voltage.
3.9 regulation voltage: The maximum voltage that a charge controller will allow the battery to reach undercharging conditions. At this point the charge controller will either discontinue charging or begin to taper thecharging current to the battery.
3.10 self discharge: The process by which the available capacity of a battery is reduced by internal chemicalreactions (local action).
3.11 self-discharge rate: The amount of capacity reduction in a battery occurring per unit of time as theresult of self-discharge.
3.12 valve-regulated lead-acid cell (VRLA): A lead-acid cell that is sealed except for a valve that opens tothe atmosphere when the internal gas pressure in the cell exceeds the atmospheric pressure by a preselectedamount. Valve-regulated cells provide a means for recombination of internally generated oxygen and thesuppression of hydrogen gas evolution to limit water consumption .
IEEE 1013-2000 pdf download
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