Umthamo ngumthamo wombane opheleleyo onokugcinwa yibhetri yelanga, olinganiswa ngee-kilowatt-hours (kWh). Uninzi lweebhetri zelanga zasekhaya zenzelwe ukuba "zikwazi ukuhlanganiswa," oko kuthetha ukuba ungabandakanya iibhetri ezininzi kunye nenkqubo yakho yokugcina i-solar-plus ukuze ufumane umthamo owongezelelweyo.
Nangona umthamo ukuxelela ukuba ibhetri yakho inkulu kangakanani, awukuxeleli ukuba ibhetri inokubonelela ngombane ongakanani ngexesha elithile. Ukuze ufumane umfanekiso opheleleyo, kufuneka uqwalasele nomlinganiselo wamandla ebhetri. Kwimeko yeebhetri zelanga, umlinganiselo wamandla bubungakanani bombane obunokunikezelwa yibhetri ngexesha elinye. Ulinganiswa ngee-kilowatts (kW).
Ibhetri enomthamo ophezulu kunye nomlinganiselo wamandla ophantsi ingabonelela ngombane omncinci (owaneleyo ukusebenzisa izixhobo ezimbalwa ezibalulekileyo) ixesha elide. Ibhetri enomthamo ophantsi kunye nomlinganiselo wamandla ophakamileyo ingasebenza ikhaya lakho lonke, kodwa iiyure ezimbalwa kuphela.