DC-AC Power Inverter Pure Sine Wave PST-1500 ... - DonRowe.com

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SECTION 7 | General Information on Batteries forPowering InvertersTable 7.2 below gives some examples of C-Rate specifications and applications:Table 7.2: Discharge current rates - “C-Rates”Hours of discharge time “T”till the “End Point Voltage”C-Rate Discharge Current in AmpsFraction Decimal SubscriptExample of C-RateDischarge Currentsfor 100 Ah battery0.5 Hrs. 2C 2C 2C 200A1 Hrs. 1C 1C 1C 100A5 Hrs. C/5 0.2C C5 20A8 Hrs.(UPS application) C/8 0.125C C8 12.5A10 Hrs.(Telecom application) C/10 0.1C C10 10A20 Hrs.(Automotive application) C/20 0.05C C20 5A100 Hrs. C/100 0.01C C100 1ANOTE: When a battery is discharged over a shorter time, its specified “C-Rate” dischargecurrent will be higher. For example, the “C-Rate” discharge current at 5 Hourdischarge period i.e. 0.2C / C5 / C/5 Amps will be 4 times higher than the “C-Rate”discharge current at 20 Hour discharge period i.e. 0.05C / C20 / C/20 Amps.Charging / Discharging CurvesFig. 7.1 (page 19) shows the charging and discharging characteristics of a typical, 6 cell,12V, Lead Acid battery at electrolyte temperature of 80°F / 26.7°C. The curves show the% State of Charge (X-axis) versus terminal voltage (Y-axis) during charging and dischargingat different C-Rates. For 24V battery, multiply voltage on Y-axis by 2 for 48V battery,multiply voltage on Y-axis by 4 (Please note that X-axis shows % State of Charge. Stateof Discharge will be = 100% - % State of Charge). These curves will be referred to insubsequent explanations.Reduction in Usable Capacity at Higher Discharge Rates –Typical in Inverter ApplicationAs stated above, the rated capacity of the battery in Ah is normally applicable at a dischargerate of 20 Hours. As the discharge rate is increased as in cases where the invertersare driving higher capacity loads, the usable capacity reduces due to “Peukert Effect”.This relationship is not linear but is more or less according to the Table 7.3 (page 19).18 | SAMLEX AMERICA INC.
SECTION 7 | General Information on Batteries forPowering Inverters12 Volt Lead-Acid Battery Chart - 80˚F / 26.7˚C16.5C/516.015.515.0CHARGEC/10C/20C/40Battery Voltage in VDC14.514.013.513.012.512.0C/100C/20C/10DISCHARGEC/5C/311.511.010.510.09.5Please note that X-axis shows %State of Charge. State of Dischargewill be = 100% - % State of Charge.9.00 10 20 30 40 50 60 70 80 90 100 110 120 130Battery State of Charge in Percent (%)Fig. 7.1: Charging / Discharging Curves for 12V Lead Acid BatteryTable 7.3 Battery Capacity versus Rate of Discharge – C-RateC-Rate Discharge Current Usable Capacity (%)C/20 100%C/10 87%C/8 83%C/6 75%C/5 70%C/3 60%C/2 50%1C 40%SAMLEX AMERICA INC. | 19
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Page 6 and 7: SECTION 2 | General InformationThe
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Page 12 and 13: SECTION 4 | Powering Direct / Embed
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Page 38 and 39: SECTION 10 | ProtectionsThe inverte
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Page 47 and 48: NOTES:SAMLEX AMERICA INC. | 47

DC-AC Power Inverter Pure Sine Wave PST-1500 ... - DonRowe.com

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