A multi-circuit direct current monitor consists of a plurality of Hall Effect current sensors mounted on a printed circuit board oriented to sense the direct current (DC) flow from power generating devices such as solar arrays, output from the Hall Effect sensors connected to an analog to digital (A/D) converter which in turn is connected to a microprocessor. The multi-circuit direct current monitor continuously monitors instantaneous and average current values for each circuit as well as total instantaneous current and average current for all active circuits. The multi-circuit direct current monitor provides continuous communications via Modbus RTU as well as providing alarm outputs if one or more circuits deviates from the average output by a percentage greater than the user specified threshold for a user-defined period of time to detect failed or underperforming power output devices.