How many DC devices are typically in buildings?

USGBC (creator of LEED) says DC consumption currently makes up about 74% of total electrical loads in homes that use electric vehicles (EVs) and HVAC equipment with DC motors. With the rise of smart buildings, that number is on the rise, as every device that requires a battery or semiconductors, requires DC power. Additionally, devices that are inherently more efficient than their predecessors frequently require DC power to operate. For example, LED lighting is known as the most efficient source of lighting today, and it operates on DC power. In the same way, HVAC systems and pumps with variable speed motors (VFDs) are also more efficient than their predecessors, and they too operate on DC power. Thus, as buildings inevitably adopt more efficient lighting and HVAC systems, more DC power will be required.

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