Synchronizing Panel is for connecting the local generator to the grid. The incoming generator has to have the same phase sequence, voltage and frequency as the grid. To do this a synchronizing panel is needed, two or more generators are sets may be used parallel in order to share the total load of system. When mains fail all generators start at a time but after some time one will be on & other will be stop as per load. When load increased above 70% of the total load the 2nd generators will be start & it synchronize with first one & total load was distributed equally on that two or more generators set & This process will go on.