# AI Server BBU Market > AI Server BBU Market: USD 1.11 billion in 2026, USD 4.36 billion by 2035, an 18.05% CAGR from 2025, as AI racks carry their own battery backup. Publisher: DC Market Insights Author: Amit Jain, DC Market Insights Published: 2026-10-22 Last updated: 2026-10-22 Next review: Apr 2027 Page: https://www.dcmarketinsights.com/report/ai-server-bbu-market ## Key takeaways - Meta's 140 kW Catalina Rack Ships with an ORv3 Battery Backup Unit - Backup Time Falls from 240 Seconds to 45-90 Seconds - 25% Section 301 Duty on Chinese Non-EV Lithium-Ion Batteries from 2026 - 800 V DC Rack and Sidecar BBU: USD 1.27 billion by 2035 **Frequently Asked Questions** **What is the size of the AI Server BBU Market in 2026?** USD 1.11 billion in 2026, up 34.19% from USD 830.40 million in 2025, according to DC Market Insights estimates. The market is projected to reach USD 4.36 billion by 2035, a CAGR of 18.05% from 2025. **How fast is the AI server BBU market growing?** 18.05% a year from 2025 to 2035, after 92.76% a year from 2020 to 2025, because the price per kW falls from USD 400 to USD 215 as backup time shortens. **What is an AI server BBU?** A battery backup unit is a lithium-ion module that sits in a shelf inside the AI rack and carries the rack load through a power cut. An OCP Open Rack V3 module delivers 3 kW for 4 minutes from 66 cells. **How much does battery backup cost for an AI rack?** About USD 400 per kW of rack load in 2025, or about USD 48,000 for a 120 kW NVL72-class rack at 240 seconds (DC Market Insights estimate), falling to USD 215 per kW by 2035. **How long does an AI server BBU run?** The 2022 ORv3 shelf runs 15 kW for more than 240 seconds; the October 2026 Mt. Diablo specification asks for 45 to 90 seconds at full load, and Lite-On's 12 kW shelf holds 45 seconds. **Which BBU segment grows fastest?** 800 V DC rack and sidecar BBUs, from zero in 2025 to USD 1.27 billion by 2035, because racks above 200 kW move off 54 V busbars. Among chemistries, sodium-ion and lithium titanate grow 41.22% a year. **Do NVIDIA GB300 racks use BBUs or capacitors?** NVIDIA built 65 joules of capacitor storage per GPU into GB300 NVL72 power shelves for sub-second smoothing; battery backup is optional. DC Market Insights puts in-rack BBU attach at 48% of new AI rack kW in 2025. **Which region leads the AI server BBU market?** North America, with USD 493.26 million or 59.4% of 2025 value by installation. The Middle East and Africa grows fastest at 21.98% a year, and India is the fastest large country at 25.80%. **Who are the leading AI server BBU makers?** AES-KY, Lite-On Technology and Delta Electronics hold about 70% of 2025 value together (DC Market Insights estimate). AES-KY's 2025 revenue rose 59.4% to NT$16.00 billion, almost all lithium-ion battery modules. **Why do AI server BBU market estimates differ?** USD 1.11 billion in 2026 is the DC Market Insights value of BBUs in AI racks only. Estimates that add BBUs in non-AI racks, cells counted twice, room UPS batteries or campus storage come out larger. ## Dataset | Series | Value | Unit | | --- | --- | --- | | Market size 2025 | 830.4 | USD million | | Revenue CAGR | 18.05 | % | | Market size 2035 | 4,360 | USD million | ## Frequently asked questions ### What is the size of the AI Server BBU Market in 2026? USD 1.11 billion in 2026, up 34.19% from USD 830.40 million in 2025, according to DC Market Insights estimates. The market is projected to reach USD 4.36 billion by 2035, a CAGR of 18.05% from 2025. ### How fast is the AI server BBU market growing? 18.05% a year from 2025 to 2035, after 92.76% a year from 2020 to 2025, because the price per kW falls from USD 400 to USD 215 as backup time shortens. ### What is an AI server BBU? A battery backup unit is a lithium-ion module that sits in a shelf inside the AI rack and carries the rack load through a power cut. An OCP Open Rack V3 module delivers 3 kW for 4 minutes from 66 cells. ### How much does battery backup cost for an AI rack? About USD 400 per kW of rack load in 2025, or about USD 48,000 for a 120 kW NVL72-class rack at 240 seconds (DC Market Insights estimate), falling to USD 215 per kW by 2035. ### How long does an AI server BBU run? The 2022 ORv3 shelf runs 15 kW for more than 240 seconds; the October 2026 Mt. Diablo specification asks for 45 to 90 seconds at full load, and Lite-On's 12 kW shelf holds 45 seconds. ### Which BBU segment grows fastest? 800 V DC rack and sidecar BBUs, from zero in 2025 to USD 1.27 billion by 2035, because racks above 200 kW move off 54 V busbars. Among chemistries, sodium-ion and lithium titanate grow 41.22% a year. ### Do NVIDIA GB300 racks use BBUs or capacitors? NVIDIA built 65 joules of capacitor storage per GPU into GB300 NVL72 power shelves for sub-second smoothing; battery backup is optional. DC Market Insights puts in-rack BBU attach at 48% of new AI rack kW in 2025. ### Which region leads the AI server BBU market? North America, with USD 493.26 million or 59.4% of 2025 value by installation. The Middle East and Africa grows fastest at 21.98% a year, and India is the fastest large country at 25.80%. ### Who are the leading AI server BBU makers? AES-KY, Lite-On Technology and Delta Electronics hold about 70% of 2025 value together (DC Market Insights estimate). AES-KY's 2025 revenue rose 59.4% to NT$16.00 billion, almost all lithium-ion battery modules. ### Why do AI server BBU market estimates differ? USD 1.11 billion in 2026 is the DC Market Insights value of BBUs in AI racks only. Estimates that add BBUs in non-AI racks, cells counted twice, room UPS batteries or campus storage come out larger. ## How to cite Data Center Market Research & Consulting | DC Market Insights, "AI Server BBU Market", updated 2026-10-22, https://www.dcmarketinsights.com/report/ai-server-bbu-market