IEEE 1361-2014 pdf free download – IEEE Guide for Selecting, Charging, Testing, and Evaluating 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 to the operational parameters that affect overall PV system design and battery performance. This document will aid in battery selection, evaluation, PV system design, and provide a test plan for evaluating the selected battery.
2. Normative references The following referenced documents are indispensable for the application of this document (i.e., they must be understood and used, so each referenced document is cited in text and its relationship to this document is explained). For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments or corrigenda) applies.
IEEE Std 937™, IEEE Recommended Practice for the Installation and Maintenance of Lead-Acid Batteries for Photovoltaic (PV) Systems. 1, 2 3. Definitions For the purposes of this document, the following terms and definitions apply. The IEEE Standards Dictionary Online should be consulted for terms not defined in this clause.
3 Ah charge efficiency: Ah charge efficiency is calculated by dividing the Ah discharged by the required Ah charged 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 PV array. battery conditioning: Battery conditioning charges a battery to its full capacity after performing multiple cycles.
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 battery capacity in ampere-hours usually at the 20-h rate divided by the discharge time in hours. A 100 Ah battery discharged/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 the monthly daily average PV ampere-hours available divided by the monthly daily average load ampere- hours. Average daily PV ampere-hours are calculated by taking the daily average solar resource for each month in kWh/m 2 times the PV array current at its maximum power point (Imp) 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 ampere- hours (Ah) divided by the load Ah. Charge Ah are calculated by integrating the set charge current over the total charge time. The actual charge Ah are not necessarily the calculated charge Ah because of charge current tapering at regulation voltage.IEEE 1361 pdf download.