What is the MOST energy-efficient method for powering equipment in a datacenter?

The most energy-efficient method for powering equipment in a datacenter is 48V DC. This is primarily due to the fact that DC power systems tend to have lower energy losses compared to AC systems. When devices operate on DC power, they eliminate the need for additional conversion steps that are typically required to convert AC power to DC, which can lead to inefficiencies and energy waste.

Additionally, the use of 48V DC allows for simpler power distribution and minimizes the amount of energy lost through heat in power supplies. This voltage is not only effective for IT equipment but also aligns well with modern practices in Power over Ethernet (PoE) applications, which can power devices such as switches and access points directly over data cables.

While other options like 240VAC 3-phase or 480V 3-phase can be efficient in different contexts, they typically introduce complexities in conversion and distribution. Furthermore, these higher voltage AC systems require more robust infrastructure and come with increased safety considerations. Therefore, utilizing 48V DC in a datacenter facilitates an energy-efficient approach that supports the growing trend of direct power delivery, helping to minimize energy consumption and improve overall operational efficiency.