Except　for　irradiance　and　temperature,　the　distribution　of　solar　spectrum　also　affects　the　electrical　performance　of　photovoltaic　(PV)　modules.　To　explore　the　effect,　this　study　conducted　long-term　experimental　measurements　on　the　wide　range　of　full　solar　radiation　spectrum　with　monocrystalline　silicon　(m-Si)　and　cadmium　telluride　(CdTe),　and　established　new　spectral　correction　function　(SCF)　under　horizontal　conditions　based　on　the　average　photon　energy　(APE).　It　is　verified　with　a　good　agreement　R2　of　0.95,　and　the　maximum　RMSE　is　only　0.017　%.　Moreover,　the　application　of　the　SCFs　to　building　vertical　façade　has　also　been　well　verified,　and　the　accuracy　of　electrical　performance　prediction　can　be　improved　by　14.51　%　(m-Si)　and　3.57　%　(CdTe).　In　addition,　this　study　combines　the　annual　horizontal　total　solar　radiation　spectrum　in　Beijing　and　gives　the　annual　spectral　gain　and　loss　(SGL)　ratio　of　two　PV　panels.　The　power　generation　performance　of　the　two　PV　modules　under　the　actual　spectrum　will　be　underestimated　for　about　53.5　%　and　99.7　%　of　the　time　in　the　whole　year.　This　study　broadens　the　dimension　of　evaluating　the　electrical　performance　parameters　of　PV　panels　and　provides　a　basis　and　guidance　for　the　accurate　prediction　and　calculation　of　photovoltaic　power　generation.　©　2024　Elsevier　Ltd