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Understanding Electric Outboards.docx

Horsepower and kilowatts are both a measure of power. If an electric outboard is rated at 25kW, then 25kW is its maximum power output at full throttle. If an internal combustion outboard is rated at 40hp, then 40hp is its maximum power output at full throttle.<br>Read more here:- https://emoelectric.co/blogs/understanding-electric-outboards/understanding-electric-outboards-horsepower-vs-kilowatt.

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Understanding Electric Outboards.docx

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  1. Understanding Electric Outboards: Horsepower vs Kilowatt Oneofthefirstthingsthatyou'llnoticeifyou'rethinkingaboutrepowering yourboatwithanelectricoutboardisthatunlikecombustionengines,electric outboardmotorsaren'tmeasuredinhorsepower,they'remeasuredin kilowatts.What'sthedifference?Well,horsepowerandkilowattsarebotha measureofpower.Ifanelectricoutboardisratedat25kW,then25kWisits maximumpoweroutputatfullthrottle.Ifaninternalcombustionoutboardis ratedat40hp,then40hpisitsmaximumpoweroutputatfullthrottle. There'saneasywaytoconvertpowerbetweenkilowattsandhorsepower.One horsepowerisequivalentto746wattsor.745kilowatts,andonekilowattis equivalentto1.341horsepower.So,ifwemultiplythepowerratingofan electricoutboardengineinkilowattsby1.341,weshouldgettheelectric outboard'spowerratinginhorsepower.Butyoudon'thavetodomuchmath beforeyoustartscratchingyourhead! Forinstance, PureWatercraft manufacturesanelectricoutboardthathasa poweroutputof25kW,andPureWatercraftstatesthatitiscomparabletoa 50hpinternalcombustionoutboard.But25kWx1.341onlyleavesuswith 33.5hp.IsPureWatercraftlyingtous? Torqeedo manufacturersat12kW electricoutboard,andTorqeedostatesthatit'scomparabletoa25hpinternal combustionoutboard.But12kWx1.341givesusjust16hp!IsTorqueedolying tousaswell?

  2. Torqeedo'scruise12electricoutboard.Torqeedostatesthatthis12kWmotorisequivalentTorqeedo'scruise12electricoutboard.Torqeedostatesthatthis12kWmotorisequivalent toa25hpcombustionoutboard. Itturnsout,neitherPurenorTorqeedoislyingtous.Theanswerliesinthe differencebetweeninputpower,shaftpowerandpropulsivepower,andthe differenceintorquecurvesbetweenelectricoutboardsandinternal combustionoutboards.Icouldtrytoexplainit,butTorqeedohasdonean excellentjobin their2023catalogue;anexcerptisbelow. "Themostmeaningfulperformanceindicatorofadrivesystemispropulsive power,whichindicatesthepowerdeliveredbythemotortodrivetheboat, whiletakingalllosses,includingpropellerlosses,intoaccount.Thismethod hasbeenusedincommercialshipbuildingfornearly100years.Manufacturers ofcombustionenginesoftenadvertiselessinformativemeasurements,such astheshaftpower,inputpower,oreventhestaticthrust.Thatwouldn’tbeso badifthedifferencesbetweenpowerratingswereminimal,butthatisn’tthe

  3. case:agasolineoutboardwithanadvertisedshaftpowerof6HPactuallycase:agasolineoutboardwithanadvertisedshaftpowerof6HPactually providesamere1.6HPofpropulsivepower." "Torqeedoe?ciencyratingsnotonlyrefertomotore?ciency,butalso discloselossesinmotor,electronics,cables,gearsandpropellers.Thanksto ourfocusonoptimizingtheentiresystem,Torqeedomotorsdeliverthe highestoveralle?ciencyonthemarket.Whencombustionenginesburn gasolineordiesel,theyprimarilyusethestoredenergytoproduceheat: 5-15%ofthesuppliedenergyisusedtopropeltheboatandtherestislost duetoine?ciencies.ATorqeedodriveconvertsbetween44%and56%ofthe availableenergyintopropulsivepower,extendingrangeandruntime.ATravel motorcanpropelalightboatmorethan10nauticalmilesandonlyconsume theequivalentofafewteaspoonsofgas." "Electricmotorscanachievethesamepropulsivepowerascombustion engineswithasignificantlylowershaftpowerbecauseofthedifferenttorque curvestheyproduce.Electricmotorsdeliverampletorque,whichisavailable atanyrotationalspeed.Thischaracteristicallowsthemtoturnlarge, e?cient,high-pitchpropellersthatwouldcauseanequivalentcombustion enginetostallatstartup.AtTorqeedo,wealwayscomparetheactual propulsivepowerofourmotorswithcombustionengines.ATorqeedomotor specifiedasa“6HPequivalent”providesthesamepowerasa6HP combustionengine,eventhoughitsshaftandinputpowermaybelower."

  4. ThisimagecomesfromTorqeedo's2023NorthAmericancatalogue Wehopethismakesiteasierforyoutocompareanelectricoutboardtoa traditionaloutboardengineifyou'rethinkingaboutrepoweringwithan electricoutboard.Ifyouhaveotherquestionsaboutelectricoutboards, electricboats,orbatteriesforelectricboats,pleasesendusanemail to luke@emoelectric.co andwewilldoourbesttoansweryourquestions!

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