Ngenxa yokuthi umthamo webhethri, ukumelana kwangaphakathi, i-voltage kanye namanye amanani epharamitha awahambisani ngokuphelele, lo mehluko ubangela ukuthi ibhethri elinamandla amancane kakhulu lishajwe kakhulu futhi likhishwe kalula ngesikhathi sokushaja, futhi umthamo webhethri elincane kakhulu uba mncane ngemva kokulimala, okungena emjikelezweni omubi. Ukusebenza kwebhethri elilodwa kuthinta ngqo izici zokushaja kanye nokukhishwa kwebhethri lonke kanye nokwehla kwamandla ebhethri. Umsebenzi we-BMS ngaphandle kwebhalansi ungumqoqi wedatha nje, okungeyona uhlelo lokuphatha. Umsebenzi wokulinganisa osebenzayo we-BMS ungafeza okuphezulu okuqhubekayo.
Ukulingana okungu-1Augesi. Dlulisa ibhethri elilodwa elinamandla aphezulu liye ebhethrini elilodwa elinamandla aphansi, noma sebenzisa lonke iqembu lamandla ukuze wengeze ibhethri elilodwa eliphansi kakhulu. Ngesikhathi senqubo yokusebenzisa, amandla asatshalaliswa kabusha ngesixhumanisi sokugcina amandla, ukuze kuqinisekiswe ukuhambisana kwebhethri ngezinga elikhulu, kuthuthukiswe ibanga lempilo yebhethri futhi kubambezele ukuguga kwebhethri.