IEEE 1361-2003 pdf download IEEE Guide for Selection, Charging, Test, and Evaluation of Lead-Acid Batteries Used in Stand-Alone Photovoltaic (PV) Systems
1.2 Purpose
This document provides guidance in understanding lead-acid battery charging requirements in relation tothe operational parameters that affect overall PY system design and battery performance. This documentwill aid in battery selection, evaluation, PV system design, and provide a test plan for evaluating theselected battery.
2.Normative references
The following referenced documents are indispensable for the application of this document (i.e., they mustbe understood and used, so each referenced document is cited in text and its relationship to this document isexplained). For dated references, only the edition cited applies. For undated references, the latest edition ofthe referenced document (including any ammendments or corrigenda) applies
IEEE Std 937IM, IEEE Recommended Practice for the Installation and Maintenance of Lead-Acid Batteriesfor Photovoltaic (PV) Systems.l
3.Definitions
For the purposes of this document, the following terms and definitions apply. The IEEE StandardsDictionary Online should be consulted for terms not defined in this clause.
Ah charge efficiency: Ah charge efficiency is calculated by dividing the Ah discharged by the required Ahcharged to maintain battery capacity under specific cycle and charging conditions.
autonomy: The length of time that a PV system can provide energy to the load without energy from the PVarray.
battery conditioning: Battery conditioning charges a battery to its full capacity after performing multiplecycles. Battery conditioning is designed specifically for obtaining maximum new battery capacity.
C/X charge discharge rate: The C/X charge and discharge rate is the manufacturer’s rated batterycapacity in ampere-hours usually at the 20-h rate divided by the discharge time in hours. A 100 Ah batterydischarged/charged at the 35-h rate would result in a discharge/charge current of 2.86 A (100/35 = 2.86 A).
calculated PV array-Ah-to-load Ah ratio (A:L): The photovoltaic (PV) array Ah to load Ah ratio is themonthly daily average PV ampere-hours available divided by the monthly daily average load amperehours. Average daily PV ampere-hours are calculated by taking the daily average solar resource for eachmonth in kWh/m’ times the PY array current at its maximum power point (lmp) at standard test conditions(STC). Array to load ratios can also be calculated in terms of their respective Watt-hour parameters.
charge-Ah-to-load Ah ratio (C:L): The charge Ah to load Ah ratio is the total available charge amperehours (Ah) divided by the load Ah. Charge Ah are calculated by integrating the set charge current over thetotal charge time. The actual charge Ah are not necessarily the calculated charge Ah because of chargecurrent tapering at regulation voltage.
IEEE 1361-2003 pdf download
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