Wattality
Wattality
Data Center BESS

Zero-Downtime Power for AI-Scale Compute.

AI and HPC clusters are rewriting power density assumptions. Legacy lead-acid UPS can't keep up. We engineer lithium-based BESS with sub-10 ms transfer, rack-level granularity, and predictive health management purpose-built for Tier III/IV facilities running 50+ kW per rack.

<10 ms
Transfer Time
80+ kW
Per-Rack Support
99.9999%
Target Availability
Scope Your BESS DesignData Center Energy Services

Why Data Center Power Infrastructure Is Breaking

🔌

AI Power Density Explosion

A single GPU rack running NVIDIA GB200 NVL72 draws 120+ kW. Traditional UPS architectures sized for 10 kW/rack cannot scale without complete infrastructure redesigns and significantly larger footprints.

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Lead-Acid End of Life

Legacy VRLA batteries degrade unpredictably, offer 3-5 year lifespans, and consume 3x the floor space of lithium alternatives. Every square meter lost to UPS rooms is a rack that could generate revenue.

⏱️

Transfer Time Requirements

GPU training jobs and real-time inference workloads cannot tolerate the 10-25 ms transfer gaps common in rotary UPS systems. A single power glitch can corrupt hours of distributed training and cost hundreds of thousands in lost compute.

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Grid Capacity Constraints

New hyperscale sites face 2-4 year utility interconnection queues. On-site BESS enables phased energization, peak shaving to stay within existing grid allocations, and bridge power during construction.

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Thermal Management at Density

Battery rooms adjacent to high-density compute halls face challenging thermal environments. Without precise per-cell thermal monitoring and active management, capacity fade accelerates and safety margins erode.

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Compliance Across Jurisdictions

Data center BESS must satisfy fire codes (NFPA 855), building codes, TIA-942 infrastructure standards, and insurance requirements simultaneously. Each AHJ interprets these differently.

Wattality's Data Center BESS Approach

We design the battery intelligence layer that integrates seamlessly with your electrical architecture, whether you're retrofitting an existing facility or engineering a greenfield AI campus. Our systems are built for the reliability standards data center operators actually need.

Data Center Energy Systems

Complete BESS architecture for data center environments: power sizing for AI/HPC load profiles, integration with existing switchgear and generators, and facility-wide energy management for peak shaving and demand response.

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Battery Management System Development

High-reliability BMS with redundant communication paths, cell-level monitoring at sub-second resolution, and predictive failure detection. Designed to meet the deterministic response requirements of critical infrastructure.

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Energy Intelligence Platform

Real-time fleet visibility across all battery assets in the facility. SoH trending, predictive maintenance scheduling, and integration with DCIM platforms for unified operations. Provides the data layer for capacity planning and Tier certification audits.

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Standards We Design & Certify Against

UL 9540A

Thermal runaway fire propagation test method. Required by most AHJs before BESS can be installed inside or adjacent to occupied data center buildings.

NFPA 855

Stationary energy storage installation standard. Defines spacing, ventilation, suppression, and deflagration requirements critical for indoor data center deployments.

TIA-942

Telecommunications infrastructure standard for data centers. Defines Tier I-IV redundancy levels for power and cooling systems, including battery backup subsystems.

IEC 62619

Safety requirements for secondary lithium cells in industrial applications. Baseline safety certification for any lithium battery system deployed in mission-critical environments.

NFPA 75 / NFPA 76

Protection of information technology equipment (75) and telecommunications facilities (76). Governs fire protection and environmental controls in spaces housing BESS adjacent to IT loads.

Typical System Specifications

Transfer Time (Mains to Battery)< 10 ms
Runtime at Full Load5 - 30 minutes (configurable)
Power DensityUp to 250 kW per cabinet
System Efficiency> 96% round-trip
Monitoring ResolutionCell-level, 1 Hz sampling
CommunicationModbus TCP, SNMP, BACnet, OPC-UA
Design Life15 years / 5,000+ cycles
RedundancyN+1 or 2N (distributed architecture)
Case Study
10C
Sustained Discharge Rate for Burst Power

High-Power NiZn Battery Platform

We developed the BMS and thermal management system for a high-power nickel-zinc battery platform capable of sustained 10C discharge rates. The architecture's fast-response characteristics and inherent safety profile make it directly applicable to data center UPS replacement where power density and non-flammability are critical.

Read Full Case Study

Trusted by Global Energy Leaders

BlackTeal Energy
LG Energy Solution
BYD
Gotion

Frequently Asked Questions

Can lithium BESS actually replace traditional UPS in a Tier IV data center?
Yes, with the right architecture. We design distributed lithium BESS with 2N redundancy, sub-10 ms transfer via static transfer switches, and predictive health monitoring that exceeds the reliability profile of centralized rotary or VRLA UPS. The key is moving battery intelligence from a passive backup role to an actively managed, continuously validated system. Several hyperscale operators have already made this transition.
How do you handle fire safety for lithium batteries inside a data center?
We design to UL 9540A propagation limits from the cell packaging stage, not as an afterthought. This includes thermal barriers between cells, per-cell temperature monitoring with early warning thresholds, off-gas detection, and integration with the facility's fire suppression system. Our rack designs are tested against NFPA 855 requirements for indoor installation, and we provide the documentation packages AHJs require for permitting.
What chemistries do you recommend for data center BESS?
LFP (lithium iron phosphate) is the default recommendation for most data center applications due to its thermal stability, long cycle life, and absence of thermal runaway propagation risk. For applications requiring extreme power density or non-flammable chemistries, we also work with NiZn and sodium-ion. Chemistry selection is driven by your specific power/energy ratio, space constraints, and risk tolerance.
How does your BESS integrate with existing DCIM and BMS platforms?
We expose all battery telemetry (cell voltages, temperatures, SoC, SoH, alarms) via standard protocols: Modbus TCP, SNMP v2c/v3, and BACnet. Our energy intelligence platform also provides a REST API and webhook integration for DCIM platforms like Nlyte, Sunbird, or custom in-house systems. No proprietary gateways required.
What is the ROI timeline for replacing lead-acid UPS with lithium BESS?
Typically 3-5 years depending on facility size. The financial case combines several factors: 3x longer battery life (15 years vs 3-5), 60-70% reduction in battery room footprint (which can be repurposed for revenue-generating racks), lower cooling load due to higher efficiency, and the ability to participate in demand response programs. We provide detailed TCO modeling during the design phase.

Engineer Your Data Center BESS

Share your facility specs, load profile, and availability targets. We'll deliver a technical architecture proposal with sizing, layout, and integration specifications.