A parallel module converter comprising: a first parallel module converter module (100, 200) to provide a first alternating current "AC" output signal and connected to a module communications bus; a second parallel module converter module (100, 200) to provide a second AC output signal and connected to the module communications bus; a master logic controller to assign a first load to one or more of the first parallel module converter module and the second parallel module converter module; the module communications bus connecting the first parallel module converter module and the second parallel module converter module; and a master communications controller connected to the module communications bus and the master logic controller to route messages therebetween; the parallel module converter characterized by comprising: a master data logger to log one or more datasets; a data storage medium to store the one or more datasets; and a data logging bus connecting the master data logger and the data storage medium; and the first and second parallel converter modules further comprising a separate data-logging communications bus connecting with the master data logger; wherein data logging communications are communicated via the separate data-logging communications bus and the data logging bus, and wherein control communications are communicated via the module communications bus. a first parallel module converter module (100, 200) to provide a first alternating current "AC" output signal and connected to a module communications bus; a second parallel module converter module (100, 200) to provide a second AC output signal and connected to the module communications bus; a master logic controller to assign a first load to one or more of the first parallel module converter module and the second parallel module converter module; the module communications bus connecting the first parallel module converter module and the second parallel module converter module; and a master communications controller connected to the module communications bus and the master logic controller to route messages therebetween; the parallel module converter characterized by comprising: a master data logger to log one or more datasets; a data storage medium to store the one or more datasets; and a data logging bus connecting the master data logger and the data storage medium; and the first and second parallel converter modules further comprising a separate data-logging communications bus connecting with the master data logger; wherein data logging communications are communicated via the separate data-logging communications bus and the data logging bus, and wherein control communications are communicated via the module communications bus. a master data logger to log one or more datasets; a data storage medium to store the one or more datasets; and a data logging bus connecting the master data logger and the data storage medium; and the first and second parallel converter modules further comprising a separate data-logging communications bus connecting with the master data logger; wherein data logging communications are communicated via the separate data-logging communications bus and the data logging bus, and wherein control communications are communicated via the module communications bus.