Samlexpower PST-1000-12 Owner's manual - Section 2 |
10 | SAMLEX AMERICA INC.
Power Rating of the inverters
ThecontinuousoutputpowerratingoftheinverterisspecifiedinActivePowerinWatts
forresistivetypesofloadslikeheatingelements,incandescentlampsetc.wherePower
factor(Pf)=1.TheSurgePowerratingisfor<1sec.
Nonresistive/reactiveloadswithPowerfactor<1likemotors(Pf=0.4to0.8),non
Powerfactorcorrectedelectronics(Pf=0.5to0.6)etc,willdrawhigherApparentPower
inVoltAmps(VA).ThisApparentPoweristhesumofActivePowerinWattsplusReac-
tivePowerinVARandis=ActivePowerinWatts÷Powerfactor.Thus,forsuchreactive
loads,highersizedinverterisrequiredbasedontheApparentPower.further,allreac-
tivetypesofloadsrequirehigherinrush/startingsurgepowerthatmaylastfor
>1to5secandsubsequentlowerrunningpower.Iftheinverterisnotsizedadequately
basedonthetypeofACload,itislikelytoshutdownorfailprematurelydueto
repeated overloading.
i
inFo
The manufacturers’ specification for power rating of the appliances and devices
indicates only the running power required. The surge power required by some
specifictypesofdevicesasexplainedabovehastobedeterminedbyactualtest-
ingorbycheckingwiththemanufacturer.Thismaynotbepossibleinallcases
andhence,canbeguessedatbest,basedonsomegeneralrulesofthumb.
Table2.1belowlistssomecommonloadsthatrequirehighsurgepoweronstartup.A
“Sizingfactor”hasbeenrecommendedagainsteachwhichisamultiplicationfactor
tobeappliedtotheratedrunningWattratingoftheloadtoarriveattheContinuous
PowerRatingoftheinverter(MultiplytherunningWattsofthedevice/appliancebythe
Sizingfactortoarriveatthesizeoftheinverter).
tABLe 2.1: inVeRteR SiZinG FActoR
type of Device or Appliance
inverter
Sizing Factor*
AirConditioner/Refrigerator/freezer(Compressorbased)
5
AirCompressor
4
SumpPump/WellPump/SubmersiblePump
3
Dishwasher/ClothesWasher
3
Microwave(whereratedoutputpoweristhecookingpower)
2
furnace fan
3
Industrial Motor
3
PortableKerosene/DieselfuelHeater
3
CircularSaw/BenchGrinder
3
Incandescent/Halogen/QuartzLamps
3
TableContinuesNextPage
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