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fortress power|SKU:3646278828371

Fortress Power DuraRack: IP65-Rated Iron Enclosure for eFlex Battery Systems

Scalable Iron Enclosure for Serious Energy Storage

Elevate your energy independence with the Fortress Power DuraRack, a premium iron enclosure engineered to seamlessly house and expand your eFlex battery system. Designed for effortless scalability and robust protection, this sophisticated solution delivers reliable, clean power for your home or business. Experience the pinnacle of energy storage with a system built for lasting performance and absolute peace of mind.

Stores up to 4 batteries — Holds four eFlex 5.4kWh units per enclosure
IP65-rated protection — Water and dust resistant for any installation
Expandable to 81KWh — Link up to 4 DuraRack units together
Passive cooling included — Built-in vent handles warm climate operation
Cold climate ready — DIN rail mount accepts thermostat for heating

$13,375.00

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Fortress-Power-DuraRack-eFlex_1
Fortress Power | DuraRack + eFlex
$13,375.00

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In the box

  • DuraRack iron enclosure
  • Integrated busbars
  • Battery cables
  • DIN rail heater mount
Fortress-Power-DuraRack-eFlex_1
Fortress Power DuraRack: IP65-Rated Iron Enclosure for eFlex Battery Systems
$13,375.00

Scalable Iron Enclosure for Serious Energy Storage

The Fortress Power DuraRack is a vetted iron enclosure built for serious energy storage, holding up to four eFlex 5.4kWh batteries in a single unit. Its IP65 rating makes it off-grid proven for both indoor and outdoor setups, whether free-standing or pad mounted. Expandable across four connected units—supporting 15 batteries and 81KWh total—this rack is a long-term investment in self-reliant power. Integrated busbars and battery cables simplify stacking, while a passive cooling vent handles warm climates and a DIN rail mount accepts a thermostat for cold weather.

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IP65 Rated
Indoor & Outdoor Safe
Expandable to 81KWh
Integrated Busbars
4
eFlex Batteries Per Rack
81KWh
Max Total Capacity
IP65
Water & Dust Rating
Fortress-Power-DuraRack-eFlex_1

Iron-Built Protection Against Equipment That Fails When It Matters

Iron construction sets the DuraRack apart from flimsy alternatives that rust out or crack under real conditions. Off Grid Vault curated this enclosure because it answers the one question that matters: will this hold up when the grid goes down? The IP65 rating means water, dust, and debris stay out — whether you mount it inside a utility room or pad-mount it exposed to the elements. Integrated busbars eliminate the guessing game of wiring multiple batteries together, so every connection is secure from day one. This is vetted infrastructure, not a seasonal experiment.

Fortress-Power-DuraRack-eFlex

Scale Your Storage Without Tearing Out What You Already Built

Start with one DuraRack holding four eFlex 5.4kWh batteries, then expand to four linked units powering 15 batteries and 81KWh total capacity. That kind of scaling happens without replacing enclosures, rewiring from scratch, or gambling on mismatched components. The integrated busbars and included battery cables make stacking additional units straightforward — your system grows as your homestead or backup requirements do. Off Grid Vault respects your investment by carrying storage infrastructure that adapts rather than becomes obsolete.

Fortress-Power-DuraRack-eFlex-6_1

Install Anywhere and Run Through Any Season Without Compromise

A passive cooling vent handles warm-climate operation without drawing extra power from your bank. For cold environments, the DIN rail heater mount lets you add a thermostat to keep cells within safe temperature ranges. Free-standing or pad-mounted, indoor or outdoor — the DuraRack removes the typical constraint of picking one installation type and hoping conditions stay perfect. This is off-grid proven craftsmanship designed for locations where weather dictates your schedule, not the other way around.

Is This Rack Right for Your Setup?

Confirm compatibility before adding to your off-grid system.

  • You have up to 4 eFlex 5.4kWh batteries to house in a single enclosure
  • Your site supports free-standing or pad-mounted installation
  • Your climate requires either passive cooling vents or DIN rail thermostat capability

Built for Real-World Scenarios

The DuraRack adapts to demanding environments where reliability matters.

Remote Cabin Power Systems
Emergency Backup Battery Banks
Solar Storage Expansion Projects

Full specifications

At a glance

Surface
Iron
Full specifications5 data points across 4 categories

Dimensions

Form FactorFree-standing or pad mounted

Power & Performance

Battery Capacity Per UnitUp to 4 eFlex 5.4kWh batteries
Maximum Expansion4 units (15 eFlex batteries, 81KWh)

Materials

Enclosure MaterialIron

Compliance & Warranty

Ingress ProtectionIP65 water and dust resistant

The Off Grid Vault Promise

We stand behind every product we carry because your independence depends on it.

Vetted QualityEvery product meets our standards for build quality and real-world performance before it earns a spot in our catalog.
Free ShippingShips free to your door with no minimums, no conditions, no fine print.
30-Day ReturnsHassle-free return window if the product doesn't fit your off-grid setup.
★★★★★
“Mounted two DuraRacks outside my shop last fall. Went through a rough winter with heavy rain and sub-freezing temps — added the thermostat on the DIN rail and the batteries stayed in range. Clean busbar connections made stacking simple. This is the kind of infrastructure that lets you stop worrying about your battery bank.”
F
First L.Boise, ID

Fortress Power DuraRack + eFlex: Scalable, Rugged Energy Storage

Unlock the full potential of your off-grid or backup power system with the Fortress Power DuraRack. This premium iron enclosure is engineered to house up to four eFlex 5.4kWh batteries, providing a clean, secure, and expandable foundation for your energy storage. Designed for both residential and commercial applications, the DuraRack delivers uncompromising durability and flexibility—allowing you to start with a single unit and scale up to a massive 81kWh system. Whether you are protecting your home from outages or powering a remote worksite, this rack system ensures your batteries are safe, organized, and ready to perform.

Key Features

  • IP65 Water and Dust Resistant: Suitable for both indoor and outdoor installations, providing reliable protection against the elements.
  • Integrated Busbars and Battery Cables: Pre-wired components enable easy, tool-free stacking and a clean, professional installation.
  • DIN Rail Heater Mount: Easily add a thermostat-controlled heater for reliable performance in cold climates.
  • Passive Cooling Vent: Engineered for optimal airflow in warm climates, ensuring consistent battery temperatures without active power consumption.
  • Expandable Architecture: Scale your system by connecting up to four DuraRack units, supporting a total of 15 eFlex batteries and up to 81kWh of energy storage.
  • Flexible Mounting: Can be free-standing or pad-mounted to suit your specific installation environment.

Specifications

  • Compatible Batteries: Fortress Power eFlex 5.4kWh
  • Maximum Battery Capacity per Rack: 4 eFlex batteries
  • System Expandability: Up to 4 DuraRack units (15 eFlex batteries total)
  • Total Energy Storage Capacity: Up to 81kWh
  • Enclosure Material: Heavy-duty iron construction
  • Ingress Protection Rating: IP65 (dust-tight and water-resistant)
  • Mounting Options: Free-standing or pad-mounted
  • Installation Environment: Indoor and outdoor rated
  • Included Accessories: Integrated busbars, battery cables, DIN rail heater mount
  • Thermal Management: Passive cooling vent (standard); DIN rail heater mount (heater sold separately)

Why Choose Fortress Power | DuraRack + eFlex

When you invest in the Fortress Power DuraRack, you are choosing a system built for longevity, safety, and future-proof scalability. Unlike standard shelving or generic enclosures, this rack is specifically engineered for the eFlex battery platform, ensuring perfect fitment and seamless electrical integration. The IP65 rating means you can install it confidently indoors or outdoors, while the passive cooling and optional heater support guarantee year-round performance in any climate. With the ability to expand from a modest 21.6kWh setup to a robust 81kWh configuration, the DuraRack grows with your energy needs—making it the smart, premium foundation for any serious off-grid or backup power system.

Additional information

Amount of eFlex Batteries

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Frequently Asked Questions

The DuraRack ships as a single iron enclosure. Assembly involves placing it on a level surface (free-standing or pad-mounted) and stacking up to 4 eFlex 5.4kWh batteries inside using the integrated busbars and included battery cables. No special tools are needed for basic setup, but ensure the site is prepared per the manual.
The DuraRack is designed exclusively for eFlex 5.4kWh batteries. Each unit holds up to 4 eFlex batteries (21.6 kWh), and you can expand to 4 DuraRack units for a total of 15 eFlex batteries (81 kWh). Always verify your inverter’s voltage and communication compatibility with the eFlex series before purchase.
The DuraRack enclosure is made of iron for durability and includes integrated busbars, battery cables, and a DIN rail heater mount. The eFlex batteries use lithium iron phosphate (LiFePO4) chemistry, known for safety and long cycle life. The rack itself is IP65 rated for water and dust resistance.
Maintenance is minimal. Keep the enclosure’s passive cooling vent clear of debris in warm climates. In cold climates, install a DIN rail thermostat (not included) to maintain optimal battery temperature. Periodically inspect cables and busbars for tightness. No routine battery maintenance is required beyond following the eFlex manual.
Returns and support are handled directly by Fortress Power. Please contact Fortress Power’s customer service for warranty claims, returns, or technical assistance. Our store does not manage returns or exchanges for this item, so review Fortress Power’s official policy before purchase.
This system is ideal for homeowners or businesses needing scalable, high-capacity backup power or off-grid energy storage. It’s suitable for both indoor and outdoor installations thanks to its IP65 rating. The expandable design (up to 81 kWh) serves those with growing energy demands, such as whole-home backup or solar self-consumption.
SKU: 3646278828371 Categories: , Brand:

The Off Grid Vault Promise

We stand behind every product we carry because your independence depends on it.

Vetted Quality Every product meets our standards for build quality and real-world performance before it earns a spot in our catalog.
Free Shipping Ships free to your door with no minimums, no conditions, no fine print.
30-Day Returns Hassle-free return window if the product doesn't fit your off-grid setup.

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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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