DIRECT CURRENT ISOLATED-PARALLEL UNINTERRUPTIBLE POWER SUPPLY SYSTEM

A Direct Current (DC) Isolated-Parallel (Iso-Parallel or IP) Uninterruptible Power Supply (UPS) system and method for converting incoming AC power to DC power using several modules which are paralleled at their outputs yet fault isolated from each other. The DCIP UPS has two or more modules connected to a common IP Bus which operates at AC voltage and is disposed between a facility electrical distribution system and the facility's critical electrical loads which operate at DC voltage. The electrical distribution system receives power from a local utility, or from a standby power source when utility power is unavailable, and delivers AC power to the DCIP UPS input. The DCIP UPS converts the power to DC and delivers it to critical electrical loads associated with computer equipment or other devices using DC power. The individual modules that comprise the DCIP UPS share the DC loads equally, yet remain isolated such that a fault within one module or its load will not disrupt the operation or loads of the remaining modules.