DC power storage containers for urban lighting

Can DC lighting help achieve a zero energy building?

DC lighting can contribute to a Zero Energy Building, as demonstrated by the recently completed headquarters of the American Geophysical Union in Washington, D.C. This building is a prominent example of how Photovoltaic (PV) systems can be directly coupled to DC lighting. In 2016, the U.S. Army installed a DC microgrid at Fort Bragg, NC, which included DC lighting for its resiliency.

Do DC lighting and building microgrids save energy?

Although a DC lighting and building microgrid can save 10-18% energy, the non-energy benefits are often the most compelling. (Figure 3 indicates the combined results of the RFI and interviews regarding DC lighting and DC building microgrids.)

What is DC and how does it work?

DC (Direct Current) facilitates the ability to more easily and directly connect renewable resources such as solar photovoltaics (PV) and energy storage batteries to DC building loads like LED lighting, computers and electronics, electric vehicle chargers, and variable-speed heating, ventilation, and air conditioning (HVAC) equipment. DC makes the connection process simpler and more efficient.

How does a building use DC power?

DC power is directly connected to the DC building loads such as HVAC systems and electric vehicle chargers after being distributed through the building. Typically, 380 V DC is used to power large building loads.