mfpcu blocks and paths for different modes of operation fig3 shows the most typical mode of operation for an mfpcu it illustrates ac sourced high efficiency lighting wherein load 11 is a fluorescent light load using dc input ballasts utility ac power at 15 feeds into bi directional ac dc power supply 2 where it is converted at unity power factor via power factor correction 4 to dc which flows toward dc isolation block 8 via line 16 and onward to dc lighting load 11 in fig3 no external storage device or alternate dc source are shown they may simply not be implemented at this mfpcu or they may just not be contributing power at this time fig4 shows operation during a utility power outage power to supply dc load 11 is supplied via line 21 by alternate dc source 14 via line 19 through dc dc converter 9 and by external storage device 10 via lines 22 and 16 through dc isolation block 8 note that bi directional power supply 2 is not involved in this operation since it is shut down by anti islanding means 5 fig5 shows a multi mfpcu enterprise operating so as to reduce power demand from utility feeder 43 entering distribution panel 44 central data block 12 is sampling demand via line 45 via network of bi directional data lines 17 it can keep track of the status of each mfpcu the distribution of utility power to each mfpcu is shown as a single line 46 for simplicity although multiple branch lines would probably be used in this example dc load 42 has heavy demand from mfpcu 32 mfpcu 31 has its load shut down but its storage device 41 has some capacity mfpcu 30 is supplying.