An electrical power input adapter coupled to a direct current (DC) bus in a power distribution system receives either an alternating current (AC) power signal or a DC power signal at a first voltage level to transmit to the DC bus. An electrical converter receives and converts the received signal to a DC power signal at a second fixed voltage. A second interface includes a current limiter to receive and limit an amperage of the DC power signal at the second voltage. A programmable switch coupled to the current limiter receives the DC power signal at the second voltage and at the limited amperage and transmits the DC power signal at the second voltage and at the limited amperage. A controller coupled to the programmable switch controls when, within a period of time, the programmable switch is to transmit the DC power signal at the second voltage and at the limited amperage. An integrator receives the DC power signal at the second voltage and at the limited amperage when transmitted within the period of time and converts it to a DC power signal at the second voltage and at a second amperage that is proportional to the limited amperage integrated over the period of time.