Fortress-Power-DuraRack-eFlex_1 Fortress Power | DuraRack + eFlex $13,375.00
fortress power|SKU:3646278828371-var-61755-ed7e49

Fortress Power DuraRack + eFlex Battery Enclosure System

Secure Your Energy Storage with a Vetted Iron Enclosure

The Fortress Power DuraRack with eFlex delivers a seamlessly integrated energy storage solution that scales with your power needs. Engineered for uncompromising reliability, this premium system combines a robust, weather-resistant enclosure with intelligent battery management to provide silent, emissions-free backup for your home or business. Elevate your energy independence with a system designed to perform flawlessly in any environment, offering both peace of mind and lasting value.

Scale to 81KWh total — Expand across four DuraRack units for serious storage
IP65 weather protection — Safe indoors or outdoors in any conditions
Integrated busbar system — Battery cables included for fast, clean stacking
Climate-ready design — DIN rail heater mount and passive cooling vent
Flexible mounting options — Free-standing or pad mounted to fit your space
  • Free Shipping -- Ships free to your door, no minimums

Price range: $9,275.95 through $12,070.95

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In the box

  • DuraRack iron enclosure
  • Integrated busbars
  • Battery cables
Fortress-Power-DuraRack-eFlex_1
Fortress Power DuraRack + eFlex Battery Enclosure System
$9,275.95 – $12,070.95Price range: $9,275.95 through $12,070.95

Secure Your Energy Storage with a Vetted Iron Enclosure

The Fortress Power DuraRack is a vetted, off-grid proven iron enclosure designed to house up to four 5.4kWh eFlex batteries. Built with solid craftsmanship, this rack easily scales to 81KWh across four units, making it a reliable investment for serious energy independence. It includes integrated busbars and battery cables for straightforward stacking. Whether you need a free-standing or pad-mounted setup for indoor or outdoor use, this IP65-rated enclosure handles the elements. Ships free with flexible financing options available to fit your project timeline.

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IP65 Weather Rated
Integrated Busbars
DIN Rail Heater Ready
Scales to 81KWh
4
Max Batteries Per Rack
81KWh
Total Expandable Capacity
IP65
Water & Dust Resistance
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Build Storage That Survives Decades, Not Seasons

The DuraRack's iron enclosure with IP65 water and dust resistance is the direct answer to equipment that fails when it matters. Unlike flimsy racks from big-box stores, this unit uses integrated busbars and included battery cables for clean, secure stacking — no loose connections, no guesswork. Off Grid Vault selected this enclosure because it's built for real-world deployment, not showroom displays. Free-standing or pad mounted, it handles indoor and outdoor installations without compromise. When your investment needs to deliver year after year, this is the rack that earns its place.

Fortress-Power-DuraRack-eFlex

Grow Your System Without Starting Over

The DuraRack stores up to four eFlex 5.4kWh batteries in a single unit, and scales to four connected units holding fifteen batteries total — that is 81KWh of capacity. This modular approach means you add storage as your needs grow, without replacing your initial build. Whether you are powering a remote cabin, backing up critical loads, or going fully grid-independent, the expansion path is built in from day one. Each unit connects cleanly through the integrated busbar system, keeping your battery bank organized and accessible.

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Engineered for Extreme Temperatures

Cold climates and hot environments both demand specific design choices. The DuraRack includes a DIN rail heater mount so you can add a thermostat for low-temperature protection. For warmer deployments, a passive cooling vent manages heat without requiring fans or additional power draw. This dual-climate capability is what separates a curated enclosure from a generic metal box. Off Grid Vault selected this rack because it accounts for the real conditions self-reliant homeowners face — from freezing northern winters to scorching southern summers — without requiring separate components.

Is This Rack Right for Your Build?

Verify your setup meets these requirements for a seamless installation.

  • Site accommodates free-standing or pad-mounted installation
  • Configuration uses exactly 3 or 4 eFlex batteries
  • Location requires IP65 indoor or outdoor protection

Built for Self-Reliant Living

This DuraRack adapts to demanding off-grid and backup power scenarios.

Remote Cabin Power Banks
Grid-Independent Homesteads
Whole-Home Backup Systems

Full specifications

At a glance

Dimensions
See product page
Surface
Iron
Full specifications6 data points across 4 categories

Dimensions

DimensionsSee product page

Power & Performance

Capacity per RackUp to 4 eFlex 5.4kWh batteries
Total Expandable CapacityUp to 4 units (15 eFlex batteries, 81KWh)

Materials

Enclosure MaterialIron

Compliance & Warranty

Ingress ProtectionIP65 WATER AND DUST RESISTANT
Battery Configurations3 eFlex Batteries, 4 eFlex Batteries

The Off Grid Vault Promise

Every product we carry is held to strict standards so you can build with confidence.

Vetted EquipmentWe verify build quality and real-world performance before anything makes it to our catalog.
Ships FreeYour DuraRack ships free with no minimums or hidden conditions.
30-Day ReturnsIf it doesn't fit your build, send it back within 30 days hassle-free.
★★★★★
“I installed two DuraRacks with eight eFlex batteries for my cabin system. The integrated busbars made stacking straightforward — no custom wiring needed. We had a week of heavy rain right after mounting one unit outside, and not a drop got inside. This is the kind of enclosure that lets you stop worrying about your batteries and focus on actually using your power.”
F
First L.Bozeman, MT

Fortress Power DuraRack + eFlex: Scalable, Weather-Resistant Energy Storage

Unlock the full potential of your solar energy system with the Fortress Power DuraRack, a premium iron enclosure engineered for seamless, expandable battery storage. Designed to house up to four eFlex 5.4kWh batteries in a single unit, the DuraRack provides a robust foundation for your backup power needs. Whether you are building a new system or scaling an existing one, this solution offers the flexibility to expand up to four interconnected units, supporting up to 15 eFlex batteries for a total of 81 kWh of clean, reliable energy. With integrated busbars, pre-installed battery cables, and an IP65-rated weather-resistant design, the DuraRack is built for both indoor and outdoor installations, delivering peace of mind in any climate.

Key Features

  • IP65 Water & Dust Resistant: Safely install indoors or outdoors with confidence, thanks to a rugged, weather-sealed enclosure that protects your batteries from the elements.
  • Integrated Busbars & Battery Cables: Simplify installation and stacking with factory-installed busbars and pre-terminated battery cables, reducing setup time and ensuring reliable connections.
  • Expandable Up to 4 Units: Scale your energy storage as your needs grow—connect up to four DuraRack units to support a total of 15 eFlex batteries, delivering an impressive 81 kWh of backup power.
  • DIN Rail Heater Mount (Easy to Add): Optimize performance in cold climates by easily mounting a DIN rail thermostat to maintain ideal battery operating temperatures.
  • Passive Cooling Vent: Stay cool in warmer climates with a built-in passive ventilation system that helps regulate internal temperatures without active energy consumption.
  • Free-Standing or Pad Mounted: Choose the installation method that works best for your space—standalone on a level surface or secure to a concrete pad for permanent placement.

Specifications

  • Enclosure Material: Heavy-duty iron construction
  • Battery Capacity per Unit: Up to 4 eFlex 5.4kWh batteries (21.6 kWh per DuraRack)
  • System Expandability: Up to 4 interconnected DuraRack units (15 eFlex batteries; total 81 kWh)
  • Weather Resistance: IP65 rated (water and dust resistant)
  • Installation Options: Free-standing or pad mounted
  • Climate Features: Passive cooling vent; DIN rail heater mount (heater sold separately)
  • Included Components: Integrated busbars and battery cables
  • Compatibility: Designed exclusively for Fortress Power eFlex 5.4kWh batteries

Why Choose Fortress Power | DuraRack + eFlex

The Fortress Power DuraRack is more than just a storage enclosure—it is a strategic investment in scalable, durable energy independence. Unlike generic battery cabinets, the DuraRack is engineered specifically for eFlex batteries, ensuring a perfect fit, simplified wiring, and maximum system efficiency. Its IP65-rated construction allows for flexible placement in garages, basements, or even outdoor settings, while the integrated busbars and cables eliminate the guesswork from installation. Whether you are preparing for grid outages, time-of-use savings, or off-grid living, the DuraRack + eFlex combination delivers the reliability and expandability that premium solar systems demand. Backed by Fortress Power’s reputation for quality and performance, this solution is built to protect your energy investment for years to come.

Price: $9,275.95 (Includes DuraRack enclosure and 3 eFlex 5.4kWh batteries unless otherwise specified. Additional battery configurations available—select your preferred option above.)

Additional information

Amount of eFlex Batteries

3 eFlex Batteries, 4 eFlex Batteries

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Frequently Asked Questions

The DuraRack ships as a single iron enclosure. Assembly involves placing the rack in your desired location (free-standing or pad-mounted) and stacking up to 4 eFlex 5.4kWh batteries inside. Integrated busbars and battery cables are included for easy stacking. No special tools are required beyond standard hardware for pad mounting if chosen.
Yes, the DuraRack is designed specifically for eFlex 5.4kWh batteries. It holds up to 4 batteries per unit (21.6 kWh) and is expandable to 4 linked units, supporting up to 15 eFlex batteries for a total of 81 kWh. Ensure you use only Fortress Power eFlex batteries for compatibility and safe operation.
The DuraRack is constructed from iron, providing a durable and sturdy enclosure for battery storage. It features an IP65 water and dust-resistant rating, making it suitable for both indoor and outdoor installations. The rack includes integrated busbars and battery cables for streamlined electrical connections.
Maintenance is minimal. Keep the enclosure clean and free of debris, ensuring vents (passive cooling vent for warm climates) are unobstructed. For cold climates, you may add a DIN rail thermostat (not included) to prevent battery performance issues. Batteries require no routine maintenance beyond periodic visual checks for damage or corrosion.
Returns are subject to the store's standard policy; contact customer support for authorization and details. For technical support, Fortress Power offers assistance via their official channels. Warranty terms are not specified in the product data, so please refer to Fortress Power or the seller for specific coverage information.
This system is ideal for homeowners or businesses needing scalable off-grid or backup power storage. It suits those with moderate to high energy demands, as it can expand up to 81 kWh. The IP65 rating allows flexible indoor or outdoor installation, making it suitable for residential, commercial, or remote applications where reliable energy storage is critical.
Yes, the IP65 water and dust-resistant rating makes it safe for outdoor installation. It can be free-standing or pad-mounted. If pad-mounted, a concrete pad is recommended for stability, but the product data does not specify if one is included. Ensure the pad is level and meets local building codes for outdoor electrical equipment.
The DuraRack includes a passive cooling vent for warm climates and a DIN rail heater mount for cold climates. The heater and thermostat are not included but can be added separately. This allows you to customize temperature management based on your local environment, ensuring optimal battery performance year-round.
SKU: 3646278828371 Categories: , Brand:

The Off Grid Vault Promise

Every product we carry is held to strict standards so you can build with confidence.

Vetted Equipment We verify build quality and real-world performance before anything makes it to our catalog.
Ships Free Your DuraRack ships free with no minimums or hidden conditions.
30-Day Returns If it doesn't fit your build, send it back within 30 days hassle-free.

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About fortress power DuraRack

fortress power is a trusted manufacturer of premium durarack. OffGridVault is an authorized dealer offering the full fortress power lineup with free delivery, price match guarantee, and expert support.

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