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1、http://www.coolflatroof.com/solar-power-guide.phpSolarPVGuide:Prices,Design,Installation&Pay-offPeriod(ROI)SolarPhoto-voltaic(PV)technologyisthewayofthefuture,forgeneratingandsupplyingelectricpowerforhomesandbusinessesintheUSandacrosstheworld.Despitethegreatpotent
2、ialofSolarPV,currentcostandefficiencyofsolarpanelsmakesthemagreen,yetexpensivealternativetoconventionalwaysofgeneratingelectricity,suchasCoal,GasandOilfiredpowerplantsaswellasNuclearandHydroelectricity.Mainobstaclethatisholdingthewide-spreadofsolarPVisthelongROI(r
3、eturnoninvestment)thatinsomesituationsmayexceed10years.Fortunately,USfederalgovernmentandlocalandstategovernmentshaveamultitudeofincentivesandrebateprogramsforsolarandotherrenewableenergyprojects.PlanningaSolarPVsystemWhenconsideringinstallingaSolarPVsystem,youash
4、omeorbusinessownerwillneedatoknowthefuturesizeofyoursolarsysteminkW(1kilowattis1000watts)andthecostassociatedwiththissolarsystem.Youalsoneedtoestablishyourcurrentannualelectricityusageanddecideifyouwanttoreduceorcompletelyeliminatetheuseofelectricitythatyoupurchas
5、efromyourutilitycompany.First,gatheryourelectricbillsforthelast12months,recordyourtotalelectricityconsumption–thenumberofkW-hours,andyourthetotalamountyouhadtopay,excludinganylatefeesandothermiscellaneousfees.DivideyourtotalcostbythetotalnumberofkWh–thiswillgiveyo
6、urealcostperkWh.InMassachusetts,averagecostofelectricityforresidentialuseis19-24centsper第6页，共6页kWh,and15-17centsperkWhforcommercialuse.Botharesettoincreaseby20%innearfuture,asannouncedinApril2008,bylocalutilitycompanies.DesigningaSolarPVsystem,tailoredforyourneedI
7、nMassachusettsandsurroundingstates,wehaveanaverageof4.5sunhoursperdayannually.Thisaccountsforrainyandcloudydaysaswellaslong,sunnysummerdaysandshortwinterdays.Tomakebestuseofyoursolarsystem,youwillneedtocaptureasmuchsun-lightaspossible,thereforethebestlocationtopla
8、ceyoursolarsystemisonthesouth-facingsideoftheroof.Youalsowantthemtobeinstalledatacertainangle–about20-30degrees.Assumingthe4.5hoursofsunperday,a1kWSolar
