thanks for your question if the electricit powe is swithched off or there is a powe failure it impacts the cycle leading to change in the physical characterstics of the cake including the collapse or disapperance of the cake etc so it is very much advisable to connect the lyophilsier to 24 x7 uninterrupted power supply when the main power is cut off the generator should be immediately connected with automatic change over
Regards
Prasad