Kategori: Data Center Trends

Today, we will take a closer look at the 800V DC concept, which we have started hearing more frequently in recent times and which is rapidly becoming part of our lives, as well as the design principles behind it.

Why do we need 800V DC? How does 800V DC add value to data centers? What are its benefits to the system, and what are its risks? We will try to answer all of these questions.

In terms of AI load characteristics, GPUs are essentially DC-powered, with low-voltage DC levels being used within the power electronics architecture. Today, 12V and particularly 48–54V DC are used as low-voltage rack-level distribution levels. With the NVIDIA GB200 and GB300 platforms, rack-level power requirements have increased significantly. Although 48–54V DC can support rack power levels in the hundreds of kilowatts, as rack power density increases, distribution current, copper requirements, busbar volume, and I²R losses are becoming significant design constraints.

So, what happens when we move beyond these levels in high-density AI racks?

Yes, this is exactly where we are now discussing 800V DC architectures designed to address rack-level power requirements of 400 kW and above in a more efficient and scalable way.

800V DC not only provides a more compact solution for high-capacity power requirements, but also makes the system more efficient and scalable. The fundamental principle is actually quite simple: increase the voltage while keeping the power constant in order to reduce the current.

This enables us to reduce copper requirements and I²R losses, optimize busbar and cable cross-sections and volumes, deliver higher power per rack, and make the power distribution system easier to scale.

For example, let’s consider a 1 MW rack:

At 54V DC: approximately 18,519 A

At 800V DC: 1,250 A

Therefore, by increasing the voltage while maintaining the same power, we can reduce the current by approximately 15 times.

The purpose of 800V DC is not to operate the GPU directly at 800V DC. GPUs continue to operate at much lower DC voltage levels required by their power electronics and semiconductor architecture. Instead, 800V DC is used as a power distribution voltage to deliver high power to AI racks at significantly lower current levels.

So, another question naturally arises: why 800V? Why not 1,000V?

What is the secret behind 800V, or, to put it in a slightly humorous way, what stopped us at 800V? 🙂

800V is not simply a solution designed to reduce current. It represents an engineering optimum in which multiple parameters are considered together, including insulation, safety, component availability, DC fault interruption, and DC/DC conversion ratio.

As voltage increases, current decreases; however, insulation requirements increase, clearance and creepage distances increase, DC fault interruption becomes more complex, extinguishing DC arcs becomes more challenging, DC breaker design becomes more demanding, and switchgear and protection requirements increase.

Therefore, rather than simply using the highest possible voltage, it is more accurate to consider 800V DC as a balanced engineering solution between high power density, efficiency, safety, insulation requirements, protection, and overall system cost.

After talking about all these benefits and added value, does this system have any risks?

Of course, it does.

One of the key challenges is that DC systems do not have a natural zero-crossing point, which means that an arc generated during a fault or switching event can be more difficult to extinguish than in AC systems. Therefore, the protective measures implemented in the system are also critical.

Busbar connection points, DC breakers, cable terminations, rack connections, disconnect switches, and connectors are all critical points that require careful consideration.

So, how can we manage these risks?

In fact, with the right design principles, these risks can be effectively controlled.

Using DC-rated circuit breakers, appropriate DC fuses, Arc Fault Detection, Fast Fault Detection, Solid-State Protection, Insulation Monitoring, Ground Fault Detection, thermal monitoring systems, and periodic torque checks, together with selectivity / protection coordination studies, are all critical.

In addition, during the design phase, it is essential to use engineering software such as ETAP to perform Load Flow, Short Circuit, Protection Coordination, and Arc Flash analyses, and to simulate how the system will behave under different fault scenarios.

Therefore, I am confident that 800V DC will become increasingly present in our lives in the coming years, and that we will soon be discussing power densities and capacity levels in data centers that we are not even considering today.

Especially with the arrival of Vera Rubin and subsequent generations of AI platforms, rack-level power requirements in data centers will move to completely different levels. Therefore, preparing our infrastructure for the transition to 800V DC today is becoming an increasingly important consideration.

I will reach out to another design points in my upcoming blog posts. Wishing you a smooth path ahead—may everything in your life run as smoothly and beautifully as a well-designed data center. Here’s to success and happiness!

Hello,

In recent days, we’ve been discussing BESS (Battery Energy Storage Systems) more frequently, but what exactly is it, and what role does it play in data centers?

Many people confuse BESS with UPS systems in data centers. While they may appear similar at first glance, they serve very different purposes. BESS is designed to be integrated with renewable energy sources such as solar, wind, or other green supply systems. However, it can also be connected to the utility grid. The main role of BESS is to store excess energy generated by renewable sources during periods of production, and then supply this energy when those sources are unavailable—such as at night or during outages.

Because of this capability, BESS has the potential to reduce or even replace the reliance on traditional generator (genset) systems in data centers. Although BESS may seem similar to UPS due to shared components like batteries and inverters, their purposes are fundamentally different.

UPS systems, on the other hand, provide instantaneous power transfer, typically within milliseconds. When a power outage or fluctuation occurs, the UPS immediately takes over to ensure continuous power to critical equipment. This switchover typically occurs within 0–10 milliseconds, preventing any data loss or hardware damage.

Additionally, UPS systems filter out electrical noise and harmonics, thereby protecting sensitive electronics and improving overall power quality.

In contrast, BESS is primarily focused on energy storage and load management, so functions like instantaneous transfer and harmonic filtering are not its main strengths.In addition to backup power, modern BESS solutions also provide advanced functionalities such as peak shaving, load shifting, frequency regulation, and other grid services. These capabilities make BESS a dynamic component in energy-efficient and resilient data center power architectures.

Moreover, while BESS can provide longer backup durations, UPS systems are usually designed for short-term backup—typically around 10–15 minutes—just enough time to allow generators or alternative systems to start up.

When we consider sustainable infrastructure design in data centers—especially as more facilities are now powered directly by solar PV, wind, or hybrid systems that combine renewables with the grid—the environmental impact of diesel or gas generators becomes a major concern.

Generators contribute to carbon emissions, air pollution, and noise, all of which negatively affect a data center’s sustainability profile. They also involve higher operational and maintenance costs due to fuel consumption and regular servicing needs.

For these reasons, reducing reliance on generator systems is becoming a technical and environmental priority. Integrating solutions like BESS, advanced power management platforms, and demand response mechanisms can improve sustainability, reduce emissions, lower operating costs, and enhance reliability—while also helping data centers comply with green standards and environmental regulations.

In Today’s post, I wanted to write this technical paper to help prevent confusion between BESS and UPS systems in data centers. I hope this paper finds you well.

Wishing you a smooth journey—may everything in your life run as smoothly and efficiently as a well-designed data center. Here’s to success and happiness!

Hello,

Today, I’d like to talk about the electricity demand in data centers and the future expectations surrounding this topic. What is driving this trend? What are the forecasts?

First of all, as we all know, the world has limited energy resources, and we must use every energy parameter more efficiently. According to the IEA (International Energy Agency) analysis, total data center electricity consumption is approximately 415 TWh (terawatt-hours) in 2024, which represents around 1.5% of global electricity consumption. Over the past five years, this figure has been growing at a rate of 12% annually.

The expectation is that by 2030, electricity consumption by data centers will reach around 945 TWh, accounting for about 3% of global electricity consumption. Based on these analyses, a 100% increase is expected over the next five years, clearly indicating that the demand and need for data centers will continue to grow significantly.

But what’s driving this growth?

The primary reason is the rise of AI and advanced IT technologies. According to IEA projections, with the rapid adoption of AI applications, the electricity consumption of accelerated servers is expected to grow by 30% annually. These servers alone are projected to account for around 50% of the total increase in data center electricity consumption between 2024 and 2030.

Of course, these conditions will create new challenges—both in terms of infrastructure capacity and general system requirements. In my upcoming blog posts, I will aim to explain the latest technologies, the characteristics of AI-driven workloads, and how these trends are expected to impact data center infrastructure.

When we consider that the United States and China are responsible for nearly 80% of global electricity consumption in data centers (with the U.S. at 240 TWh and China at 175 TWh), it becomes clear why modern data center design and equipment technologies are more critical than ever.

What awaits us in the future? How can we prepare starting today?

I will reach out to them in my upcoming blog posts. Wishing you a smooth path ahead—may everything in your life run as smoothly and beautifully as a well-designed data center. Here’s to success and happiness!g posts. Wishing you a smooth path ahead—may everything in your life run as smoothly and beautifully as a well-designed data center. Here’s to success and happiness!