Fortress Power DuraRack – Indoor / Outdoor Enclosure (without battery)
Fortress Power DuraRack – Indoor / Outdoor Enclosure (without battery)
Fortress Power DuraRack – Indoor / Outdoor Enclosure (without battery)

Fortress Power DuraRack – Indoor / Outdoor Enclosure (without battery)


Regular price$1,015.00

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Fortress Power DuraRack – Indoor / Outdoor Enclosure (without batteries)

Expand your energy storage with the Fortress Power DuraRack

This iron enclosure stores up to 4 eFlex 5.4kWh batteries, and is expandable up to 4 units (15 eFlex batteries, 81KWh).

The DuraRack includes integrated busbars and a DIN rail heater mount. This enclosure can be free-standing or pad mounted and is safe for indoor and outdoor installations.


  • IP65 water and dust resistant for both indoor and outdoor install
  • Includes intergrated busbars and battery cables for easy stacking
  • Easy to add din rail thermostat for cold climates
  • Passive cooling vent for warm climates
  • Expandable up to 4 units (15 eFlex batteries; total 81 KWh)



Enclosure Material Carbon Steel
Enclosure Protection IP65 water and dust proven (outdoor)
Enclosure Color White
Dimensions [W x H x D] 29.29 x 41.34 x 18.03 in (744 x 1050 x 458 mm)
Enclosure Weight 59.6 kg / 153.2 lbs
Maximum Battery Units 4 eFlex 5.4
Storage Capacity Range 5.4kWh - 21.6 kWh per unit
Max. Storage Capacity 81 kWh (4 unites in parallel)
Knockout Size 1inch & 2 inch
Positive and Negative Battery Busbars 2 x 4 points; M8 (5/16) Terminal Rings
Positive and Negative Busbars to Inveter 2 points; m10 (3/8) Terminal Rings
Battery Cables 4 sets of
Terminal Torque 7.0 - 7.7 Nm (5.1 - 5.7 ft-lb)
Enclosure Warranty 3 Years
Certifications UL9540, UL9540A, UL1973, CEC, SGIP



Does energy storage work well with my solar system?
Yes. On the grid? Absolutely! Energy storage adds a lot of value to your solar systems. It keeps your solar system operating when your utility service is interrupted. Without energy storage, your PV system will be forced to shutdown when the grid is off.

If you live off grid, energy storage enables you to use the clean solar energy to power your home day and night.

We also know you’re a fan of conservation—energy storage saves both your surplus solar energy and your cash since it reduces on grid energy dependence.

Can I use energy storage without solar panels?
Absolutely. For on grid clients, a home energy storage unit  stores energy from your electricity provider. If an outage occurs, home energy storage can provide up to 24 hours of potentially life-saving power.

Need more reassurance? Fortress Power offers batteries with larger storage capabilities, completely customizable to your needs. And, like you, we appreciate saving money. When electricity is at its lowest daily rate, our smart energy storage units use that period to charge. When peak electric use occurs, our energy storage units can discharge power to suit your lifestyle.

What about power outage protection?
Power interruptions shouldn’t disrupt your schedule. An energy storage system will keep your solar system operating during grid outages. When paired with solar panels, an energy storage system supplies unlimited energy delivery.

The solar panels power your home during the day and use any excess power to charge the battery. At night, the system keeps your space bright. When used without solar panels, power outage support is dependent on battery size and your energy use. Batteries providing at least 12 hours of backup power are safest.

Are home energy storage systems financially beneficial?
You can use the energy storage to shelve your peak usage. When electricity is at its lowest daily rate, our smart energy storage uses that period to charge. During the peak periods, our energy storage system can power your home, reducing your electricity bill.

Clients with solar panel installations enjoy a faster return on investment.

Do I receive incentives on my energy storage system?
If your energy storage is powered by solar panels, you are eligible for 26% federal tax credit. Many states and utilities provide rebates for homes and businesses with energy storage systems, aiming for grid resilience.

What is Lithium batteries lifespan?
We provide a 10 year product warranty and guarantee up-to 6000 cycles, whichever comes first. Speak to our representatives for details.

Why choose Lithium Iron Phosphate over Lithium Ion batteries?
We use Lithium Iron Phosphate (LiFePo4; Lithium Ferro Phosphate) technology – the safest lithium technology in the industry. It’s environmentally friendly and can be fully recycled. While Many other competitors, such as LG Chem, Tesla and Panasonic use cobalt-based Lithium-Ion battery, which has a very poor thermal stability. Any short circuit or cell-breakage can cause thermal runaway and catch fire.

And comparatively, Lithium Iron Phosphate battery deliver substantially higher amount of life cycles. We guarantee up-to 6000 cycles, while LG Chem, Tesla and Panasonic provide less than 3000 cycles.

Are Fortress Lithium batteries widely compatible?
Yes, these batteries are designed to work with all 48V chargers and hybrid inverters. We work well with Schneider, Outback, Magnum, Sol-Ark, Victron, Morningstar and so on. Please Check out our Inverter Compatibility list.

Are permits required for installation?
Legal requirements vary by location.



We provide a 10 year product warranty and guarantee up-to 6000 cycles, whichever comes first.

Have a Question?

Talk to one of our trusted experts today! Our customer support team would love to answer any questions you might have. Call us if you want to place the order over the phone (855) 601-2444 or send us your inquiry via chat.