A = 8.5W (panel idle mode) B = 0.5W (cellular backup average power consumption) C = 3W (expander average power consumption) D = 4W (keypad average power consumption) E = 6W (Security Camera - day mode average power consumption) F = 10W (Security Camera - night mode average power consumption) G = 8W (Intercom average power consumption) H (Total power) = A + B+ C*(# expanders) + d*(#键盘) + e*(#摄像头) + f*(#摄像头) + g*(#intercoms)j =备份小时您需要k(需要电池容量)= h*j