Read TRJN0168_BattSizeGuideFL.pdf text version

Battery Sizing guidelineS

General Guidelines:

· · · · · · CalculatetheloadinWatts-hoursper24-HrDay(Wh/d)asaccurateaspossible. Includesystemlossesduetoefficienciesofpowerconditioning(inverter,DC/DCconverters). Includetheappropriatefactors:Temperature,autonomy,designmargin,anddepthof discharge(DOD). ConsidershallowdailyDOD(max20%recommended)andoccasionaldeeperDOD (max80%)duringcloudydays. Usethecorrectbatteryrating(100-Hr),orabatteryratingthatapproximatestheactual autonomyhoursforthesystemload. Selecthighestbatterycapacitiesperunittoreducethenumberofbatterystringsinparallel forbetterchargebalance.Therecommendedmaximumnumberofstringsinparallelis6.

for Renewable Energy and Backup Power Applications

load calculation:

Thecomplexityoftheloadprofilewilldeterminethecomplexityoftheloadanalysisandload calculations.ForsimpleloadssumalltheACandDCloadsasoutlinedinthetablesbelow.

ac loads table

Load Description Quantity

A

Watts *

B

Duration

(hrs of Operation/24-Hr Day)

Inverter Efficiency **

D

Energy Consumption

Per 24-Hr Day (Wh/d)

C

(A x B x C) / D

Total AC Energy Consumption

*Thistableappliesforresistiveloads.Formotorapplications,pleaseconsultwithmanufacturerfortheapplicablepowerfactor. **Inverterefficiencyshallbetheaverageduringtheday,notthemaximumefficiency.Ifnotknown,pleaseuse0.80.

Sum 1

dc loads table

Load Description Quantity Watts DC Load Voltage *

C

Duration

(hrs of Operation/24-Hr Day)

DC-DC Converter Efficiency **

E

Energy Consumption

Per 24-Hr Day (Wh/d)

A

B

D

(A x B x D) / E

Total DC Energy Consumption

*Commonvoltages:12Volt,24Voltor48Volt.Forothervoltage,consultTrojanBatteryforadvice. **If&whenDC-DCconverterisrequired,pleaseuse0.85.Ifnotrequired,pleaseuse1.00.

Sum 2

Theinformationcontainedinthisdocumentisforgeneralinformationpurposesonlyanddoesnotclaimtoprovideacomprehensiveorconclusiverepresentationoftheinformationcontainedwithin. Qualified,professionaladviceshouldbeobtainedbeforemakingdecisionsorinitiatingactivitiesthatcouldhaveaneffectonyourbatteryselection.TrojanBatteryCompanyisnotliablefordamages thatmayresultfromanyinformationprovidedinoromittedfromthispublication,underanycircumstance.TrojanBatteryreservestherighttomakeadjustmentstothispublicationatanytime,without noticesorobligation.

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Battery Sizing guidelineS

total enerGy consumption calculation

Description Total AC Consumption Total DC Consumption Total Consumption Watt-hours Per 24-Hr Day Battery Bank Voltage Total consumption Amp-hours Per 24-Hr Day Calculations Steps SUM1 SUM2 SUM1+SUM2=SUM3 CommonVoltages:12V,24Vor48V SUM3/BatteryBankVoltage= Results (units) (Wh/d) (Wh/d) (Wh/d) (V) (Ahd)

for Renewable Energy and Backup Power Applications

battery bank capacity (amp-hour):

Thebatterybankcapacity,B(Ah),isthecapacityofthebatterybankrequiredtorunthedailyloadundernormalcondition(Totalconsumption Amp-hoursPer24-HrDay-seetableabove).Thisbatterybankcapacityshallbecalculatedtoaccountforsystemoperationalparameters.The followingisalistofbatterybankcapacityadjustmentfactorsthatwillservetocalculatetheadjustedandfinalbatterycapacityrequiredtorun thesystemappropriately.

adjustment Factors

Symbol TC DA DM DOD Parameter TemperatureCompensation DaysofAutonomy DesignMargin DepthofDischarge Range FloodedLeadAcid 2­10* 1­1.25** 0.2­0.8*** Comments SeeTemperatureCorrectionTable SystemDependent* SystemDependent Shallow­DeepDOD

*Forstandalonesolar,recommendedvalueis5days.Forhybrid,recommendedminimumvalueis2days. **Recommendedvalueis1.10,andtypicalvalueis1. ***Recommendedvalueis0.2,andtypicalvalueis0.5.

temperature correction Factor

(F) 77 50 32 14 (C) 25.0 10.0 0 -10 Flooded (FLA) 1.00 1.19 1.39 1.70 AGM 1.00 1.08 1.20 1.35 GEL 1.00 1.11 1.25 1.42

battery bank capacity b(ah)

Aha= AhdxTCxDAxDM DOD

Aha:Amp-hoursadjusted Ahd:Amp-hoursday(fromchartTotalEnergyConsumptionCalculation) TC:fromchartTemperatureCorrectionFactor DA:DaysofAutonomy(fromchartAdjustmentFactors) DM:DesignMargin(fromchartAdjustmentFactors) DOD:DepthofDischarge(fromchartAdjustmentFactors)

battery conFiGuration

Thebatterybankcapacitycannowbeusedtodeterminetheamountofbatteriesneededfortheinstallation. Description

Number of Strings Number of Batteries Cells / Monoblocks per String Total Batteries Cells / Monoblocks Battery Model

Calculations Steps

DividetheB(Ah)bythebattery's100-hourrate(if5daysautonomyselected)orarate thatapproximatestheactualautonomyhoursforthesystem A Dividethebatterybankvoltagebythevoltageofthechosenbatterycell/monoblock B AxB RefertoTrojanBattery'sRenewableEnergyBrochureorwww.trojanbatteryre.com

Results

TRJN0168·11/11--TRJN0168_BattSizeGuide

Trojanbatteriesareavailableworldwide. Weofferoutstandingtechnicalsupport,providedbyfull-timeapplicationengineers.

call 800.423.6569 or + 1.562.236.3000 or visit www.trojanbatteryRE.com

12380ClarkStreet,SantaFeSprings,CA90670·[email protected]

©2011TrojanBatteryCompany.Allrightsreserved.TrojanBatteryCompanyisnotliablefordamagesthatmayresultfromanyinformationprovidedinoromittedfromthis publication,underanycircumstances.TrojanBatteryCompanyreservestherighttomakeadjustmentstothispublicationatanytime,withoutnoticesorobligation.

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