A system, comprising: a first powered device port communicatively coupled to a power controller; a second powered device port communicatively coupled to the power controller; and a non-transitory machine readable medium communicatively coupled to the first and the second powered device ports (231, 232) and comprising instructions to combine output voltages of the first powered device port and the second powered device port, wherein the instructions are executable by a processing resource to: determine a power consumption of each of the first and the second powered device ports (232, 232); determine an output voltage demand of each of the first and the second powered device ports (231, 232) based on the determined power consumptions; and based on the output voltage demand, adjust an output voltage to each of the first and the second powered device ports via the power controller, the system further characterized in that a first power sourcing equipment, PSE, device associated with the first powered device port has a different power classification than a second PSE device associated with the second powered device port, and wherein: a power classification of the first PSE device comprises a designation based on a power capacity of the first PSE device; and a power classification associated with the second PSE device comprises a designation based on a power capacity of the second PSE device. a first powered device port communicatively coupled to a power controller; a second powered device port communicatively coupled to the power controller; and a non-transitory machine readable medium communicatively coupled to the first and the second powered device ports (231, 232) and comprising instructions to combine output voltages of the first powered device port and the second powered device port, wherein the instructions are executable by a processing resource to: determine a power consumption of each of the first and the second powered device ports (232, 232); determine an output voltage demand of each of the first and the second powered device ports (231, 232) based on the determined power consumptions; and based on the output voltage demand, adjust an output voltage to each of the first and the second powered device ports via the power controller, the system further characterized in that a first power sourcing equipment, PSE, device associated with the first powered device port has a different power classification than a second PSE device associated with the second powered device port, and wherein: a power classification of the first PSE device comprises a designation based on a power capacity of the first PSE device; and a power classification associated with the second PSE device comprises a designation based on a power capacity of the second PSE device. determine a power consumption of each of the first and the second powered device ports (232, 232); determine an output voltage demand of each of the first and the second powered device ports (231, 232) based on the determined power consumptions; and based on the output voltage demand, adjust an output voltage to each of the first and the second powered device ports via the power controller, the system further characterized in that a first power sourcing equipment, PSE, device associated with the first powered device port has a different power classification than a second PSE device associated with the second powered device port, and wherein: a power classification of the first PSE device comprises a designation based on a power capacity of the first PSE device; and a power classification associated with the second PSE device comprises a designation based on a power capacity of the second PSE device. a power classification of the first PSE device comprises a designation based on a power capacity of the first PSE device; and a power classification associated with the second PSE device comprises a designation based on a power capacity of the second PSE device.