Umthamo yinani eliphelele likagesi elingagcinwa yibhethri lelanga, elilinganiswa ngama-kilowatt-hours (kWh). Amabhethri amaningi elanga asekhaya aklanyelwe ukuba "ahlanganiswe ndawonye," okusho ukuthi ungafaka amabhethri amaningi ohlelweni lwakho lokugcina i-solar-plus-storage ukuze uthole umthamo owengeziwe.
Nakuba umthamo ukutshela ukuthi ibhethri lakho likhulu kangakanani, awukutsheli ukuthi ibhethri lingakunikeza ugesi ongakanani ngesikhathi esithile. Ukuze uthole isithombe esiphelele, udinga futhi ukucabangela isilinganiso samandla ebhethri. Ngokuphathelene namabhethri elanga, isilinganiso samandla yinani likagesi ibhethri elingalinikeza ngesikhathi esisodwa. Lilinganiswa ngama-kilowatts (kW).
Ibhethri elinamandla aphezulu kanye nesilinganiso samandla aphansi lingaletha inani eliphansi likagesi (okwanele ukusebenzisa izinto ezimbalwa ezibalulekile zikagesi) isikhathi eside. Ibhethri elinamandla aphansi kanye nesilinganiso samandla aphezulu lingasebenza ikhaya lakho lonke, kodwa amahora ambalwa kuphela.