A method of balancing elevator car emergency power in an elevator system (200A; 200B; 300; 400; 500; 600), the method comprising: switching a first feeder group (204; 304) of elevator cars from building power provided through a first building power feeder (208-1; 308-1; 408-1; 508-1; 608-1) to back-up power provided through a back-up power source (209-1; 309; 409; 609); switching a second feeder group (205; 305) of elevator cars from the building power provided through a second building power feeder (208-2; 308-2; 408-2; 508-2; 608-2) to the back-up power provided through the back-up power source (209-1; 309; 409; 609); selecting, using an elevator controller , at least one elevator car from the first feeder group (204; 304) of elevator cars; selecting, using the elevator controller , at least one elevator car from the second feeder group (205; 305) of elevator cars; and powering the selected elevator cars from the first feeder group (204; 304) and the second feeder group (205; 305) using the back-up power from the back-up power source (209-1; 309; 409; 609), characterised in that switching the first feeder group of elevator cars further comprises: switching a first feeder switch (207-1) from a first position that connects the first feeder group (204; 304) of elevator cars to the first building power feeder (208-1; 308-1; 408-1; 508-1; 608-1) to a second position that connects the first feeder group (204; 304) of elevator cars to the back-up power source (209-1; 309; 409; 609); and/or wherein switching the second feeder group (205; 305) of elevator cars further comprises: switching a second feeder switch (207-2) from a first position that connects the second feeder group (205; 305) of elevator cars to the second building power feeder (208-2; 308-2; 408-2; 508-2; 608-2) to a second position that connects the second feeder group (205; 305) of elevator cars to the back-up power source (209-1; 309; 409; 609). switching a first feeder group (204; 304) of elevator cars from building power provided through a first building power feeder (208-1; 308-1; 408-1; 508-1; 608-1) to back-up power provided through a back-up power source (209-1; 309; 409; 609); switching a second feeder group (205; 305) of elevator cars from the building power provided through a second building power feeder (208-2; 308-2; 408-2; 508-2; 608-2) to the back-up power provided through the back-up power source (209-1; 309; 409; 609); selecting, using an elevator controller , at least one elevator car from the first feeder group (204; 304) of elevator cars; selecting, using the elevator controller , at least one elevator car from the second feeder group (205; 305) of elevator cars; and powering the selected elevator cars from the first feeder group (204; 304) and the second feeder group (205; 305) using the back-up power from the back-up power source (209-1; 309; 409; 609), characterised in that switching the first feeder group of elevator cars further comprises: switching a first feeder switch (207-1) from a first position that connects the first feeder group (204; 304) of elevator cars to the first building power feeder (208-1; 308-1; 408-1; 508-1; 608-1) to a second position that connects the first feeder group (204; 304) of elevator cars to the back-up power source (209-1; 309; 409; 609); and/or wherein switching the second feeder group (205; 305) of elevator cars further comprises: switching a second feeder switch (207-2) from a first position that connects the second feeder group (205; 305) of elevator cars to the second building power feeder (208-2; 308-2; 408-2; 508-2; 608-2) to a second position that connects the second feeder group (205; 305) of elevator cars to the back-up power source (209-1; 309; 409; 609). <EOS>