Manufar na'urar mayar da martani na makamashin injiniya shine don canza makamashin injiniya (bit energy, energy energy) akan nauyin motsi zuwa wutar lantarki (lantarki mai sabuntawa) ta hanyar na'urar amsawar makamashi da mayar da shi zuwa grid AC don amfani da wasu kayan lantarki da ke kusa, ta yadda tsarin jan motar yana cinye wutar lantarki daga grid a cikin lokaci naúrar, don haka yana samun sakamako na ceton wutar lantarki.
Ɗauki lif da na'urar amsa makamashi a matsayin misali. Akwai yanayi guda hudu na aiki lokacin da elevator ke aiki: (1) motar da babu kowa a cikinta tana hawa kuma cikakkar kaya tana sauka, wato motar ko bangaren da ke da nauyi yana tashi, wannan shine tsarin sakin makamashin da na'urar ke da shi, tarakta yana aiki a cikin yanayin samar da wutar lantarki. (2) Motar da babu kowa a cikinta tana sauka kuma cikakken kaya yana hauhawa, wato motar ko gefen lodin yana faɗuwa, wannan shine lokacin da ƙarfin ƙarfin na'urar ke ƙaruwa, tarakta yana aiki a cikin yanayin lantarki. (3) lokacin da lif ya isa ƙasa inda birki na ragewa yake, tsarin yana sakin makamashi mai ƙarfi, tarakta kuma yana aiki a cikin yanayin samar da wutar lantarki.
Lokacin da lif ke gudana a cikin (1), (3) yanayin aiki, tarakta yana aiki a cikin yanayin samar da wutar lantarki, makamashin da aka samar yana jujjuya wutar lantarki zuwa DC akan motherboard DC ta injin lantarki da mai sauya mita. Ana adana waɗannan kuzarin na ɗan lokaci a cikin babban capacitor na da'irar DC na mai sauya mitar. Tsarin amsa makamashi shine canza wutar lantarkin DC da aka adana a cikin babban capacitor na gefen DC na lif zuwa AC da komawa ga grid na mai amfani don amfani da wasu kayan lantarki a kusa.
Wannan ya yi kama da tsarin samar da ruwan famfo: muna tattara ruwan famfo da ya zube sannan mu tace shi don dacewa da ka'idojin ruwan sha. Yin amfani da famfo mai matsa lamba, ana aika wannan ruwan zuwa wurin shan ruwan famfo ko tafki a sake amfani da shi. Idan wannan ruwa ya kai kasa da kashi 5 cikin 100 na ruwan da ginin ke amfani da shi, ba zai koma babban bututun ruwan famfo ba saboda sauran masu amfani da shi (masu amfani da shi mafi kusa) ne ke amfani da shi kafin ya samu lokacin komawa babban bututun.
Wannan bangare na wutar lantarkin ba zai koma na’urar wutar lantarkin da ake amfani da shi ba, domin wannan bangaren wutar lantarkin ya kai kashi 20-50 ne kacal na wutar lantarki da lif ke amfani da shi, wanda bai kai kashi 5% na wutar da ginin ke amfani da shi ba. Za a cinye ta da wasu kayan aikin lantarki (haske, kwamfuta, kwandishan, firiji, da sauransu).