HD5™ AC
More Energy. Simpler Installation. Lower Cost.
HD5™ AC is Prevalon’s next-generation AC battery energy storage platform—delivering 5 MWh per enclosure, industry-leading site density, and project economics that hold up at scale.
Each enclosure arrives fully assembled and factory-tested, integrating batteries, power conversion, thermal management, safety systems, and controls into a single AC block. The result is a system designed to reduce field scope, accelerate deployment, and perform reliably over the long term.
No DC collection system. No separate auxiliary power infrastructure. No need to wait for grid readiness before commissioning can begin.
Built for utilities, developers, and EPCs where cost, schedule, and performance are critical to project success.
Standards & Credentials
Built to Reduce Cost, Accelerate Deployment, and Perform Over Time
A smarter AC architecture designed to lower total installed cost, simplify construction, and sustain performance across the full asset lifecycle.
HD5™ AC addresses the constraints that drive project risk—land use, EPC complexity, schedule delays, and lifecycle economics. By integrating the power conversion system directly into each enclosure, the platform removes the need for 1500V DC collection infrastructure, reducing material costs, cabling labor, and civil scope.
Above-ground cabling and a modular, factory-integrated design simplify site work—minimizing trenching, coordination challenges, and installation delays that commonly impact project timelines.
The result is a system that deploys faster, costs less to install, and delivers more usable energy over time.
What’s Inside the HD5™ AC
Each HD5™ AC enclosure is a complete, factory-tested energy storage system, engineered to connect directly to Prevalon’s medium-voltage transformer (MVT) for fast, confident deployment. Every 20-foot enclosure integrates a liquid-cooled LFP battery system, an integrated SPCS, thermal management, NFPA 69-compliant explosion detection and ventilation, and auxiliaries with controls interfaces—delivered as a single, pre-assembled AC block ready for commissioning. This integrated AC design eliminates the need for 1500V DC collection systems and underground trenching, reducing cabling requirements, civil work, and overall site complexity.
A Smarter AC Architecture—Built to Deliver More per Site
HD5™ AC is engineered as a fully integrated AC block to help projects deploy faster, operate more safely, and deliver more usable energy per acre. Batteries, power conversion, safety systems, and controls are integrated and factory-tested, reducing on-site complexity while improving performance across the full project lifecycle. By eliminating DC collection infrastructure and simplifying system interfaces, HD5™ AC reduces installation scope, improves constructability, and lowers overall project risk.
More energy per acre
Up to 426 MWh per acre — maximizing site utilization with modular 2-, 4-, and 8-hour configurations that scale to project requirements without redesign.
Safer by design
AC architecture lowers incident energy and short-circuit risk. Liquid-cooled LFP chemistry and NFPA 69-compliant explosion detection and ventilation are integrated at the enclosure level — not added after the fact.
Higher usable capacity
The integrated PCS eliminates auxiliary energy draw from the main battery bank, recovering approximately 1–2% additional usable energy at the system level — capacity that traditional architectures leave on the table.
Faster, simpler deployment
AC quick-connect design and factory-integrated sys-tems reduce field labor, in-stallation time, and commis-sioning risk. Self-powered auxiliaries support phased commissioning before grid power is available — elimi-nating one of the most common schedule depend-encies on utility-scale pro-jects.
Lower EPC cost
Eliminates 1500V DC ca-bling, underground trench-ing, and associated civil scope — delivering 10–15% total installed cost savings by reducing material, labor, and EPC coordination com-plexity.
Simplified electrical and auxiliary systems
No separate 480Vac auxilia-ry supply required. Auxiliaries draw directly from the MVT, enabling standard grid-tied operation and supporting commissioning before exter-nal power is available — re-ducing dependence on third-party utility coordination.
Ready when the site is ready
Self-powered auxiliaries and MVT-integrated systems support phased and hot commissioning on the pro-ject’s schedule — not the utility’s. That operational in-dependence is a meaningful schedule risk reduction on projects where grid intercon-nection delays are common.
Extended battery lifecycle
Self-powered chillers main-tain optimal battery tempera-tures during construction delays and pre-commissioning periods — protecting cell health and preserving warranty compli-ance from day one, regard-less of grid availability.
Improved system availability
Modular PCS architecture supports localized fault re-covery and faster compo-nent swap-outs — maximiz-ing availability without requir-ing full system shutdown. Faults are contained at the enclosure level, not propa-gated across the project.
Safety, Compliance & Cybersecurity—Built In
Certified, cyber-secure, and designed to meet the com-pliance requirements of grid-critical assets.
HD5™ AC is engineered from cell to system for safety — with liquid-cooled LFP, NFPA 69-compliant explosion detection and ventilation, and adherence to the most rigorous safety standards in the industry, including UL 9540, UL 9540A, UL 1973, NFPA 855 (2026), and IEEE 1547. Factory integration means safety systems are tested before the system leaves the facility, not commissioned on-site. Cybersecurity is built into the control architecture, not layered on top. Network segmentation between control layers limits exposure, and U.S.-based development of insightOS™ ensures alignment with North American grid security requirements.
System-Level Performance, Delivered in the Field
HD5™ AC is validated at the system level—ensuring efficiency, noise, and lifecycle performance are delivered as installed, not assembled in the field. Its distributed architecture improves availability, isolating faults at the enclosure level and reducing impact to total site output.
Key Performance Highlights:
- Nameplate Energy: 5 MWh per enclosure (25°C)
- Durations: 2 / 4 / 8 hour configurations
- Round-Trip Efficiency: up to 92.5% (4-hour)
- Cycle Life: >8,000 full cycles to 65% SOH
- Rated Lifecycle: 20 years
- Low Noise: Quiet Mode support for noise-sensitive sites
Utility-Grade Control, Built in the U.S.
Every HD5™ AC project integrates insightOS™, Prevalon’s purpose-built energy management system, developed and maintained in the United States. insightOS™ delivers plant-level control, HMI, historian, and networking — supporting grid-forming, black start, microgrids, energy shifting, ancillary services, and hybrid applications. Cybersecurity is a design requirement, not an add-on. Network architecture separates control layers to limit exposure, and active monitoring capabilities protect grid-critical assets against evolving threats. For operators with NERC CIP or IEC 62443 compliance requirements, insightOS™ is built with those obligations in mind.
insightOS™ ensures HD5™ AC operates as a true grid asset — with the control depth, cybersecurity archi-tecture, and long-term con-figurability to support how the grid evolves, not just how it operates today.
HD5™ AC reflects Prevalon’s system-level approach to energy storage—integrated design, disciplined execution, and performance that lasts on site and over time.