Skip to content

Fortress Power | DuraRack | Enclosure | IP65, For eFlex 5.4kWh Batteries

Get it between

Notify me when back in stock

Free Shipping

On All Products

Easy 30 Day Returns

Return with Ease

Secure Checkout

Secure Payment

At Crisis Comforts, we are committed to providing you with the best prices online. If you find a lower price for the same product, we guarantee to match or beat that price.

How it Works:

1. Eligibility: This guarantee applies to select products in our store.

2. Contact Us: Reach out to us via email or chat with your price match request.

3. Proof Required: Please provide a screenshot, link, or any other evidence of the lower price
before making your purchase.

For full details, refer to our Price Match Policy Rules.

At Crisis Comforts, we take pride in offering the best refund and return policies in the industry. If you're not satisfied with your purchase for any reason, you may return it to us within 30 days for a refund.

How it Works:

1. Initiate a Return: If there are any issues with your order, such as missing components, damages, or a non-functioning product, please contact us as soon as possible.

2. Troubleshooting: Some issues can be resolved by reviewing the product manual or our product FAQs.

3. Contact Us: Reach out via email or chat for assistance.

For full details, refer to our Refunds & Return Policy.

Order Processing

Once we receive your order, we will send you a confirmation email. We will then process your order by confirming that the product is in stock and ready for shipment. If any of the items in your order are back-ordered, we will reach out to you via email or phone, and you may choose to either wait or receive a 100% refund.

Please allow 1-3 days for processing your order.


Shipping times and methods will depend on the specific product and brand you purchase. If you have any shipping questions, feel free to ask on the chat or email us at

We will send tracking information by email the same day the shipping tracking number is created/available.

Before you sign the shipping bill, please THOROUGHLY INSPECT YOUR ITEM. Signing for the receipt of a damaged product removes the liability of the shipping company and Crisis Comforts. Once you accept your shipment as non-damaged, your item is your property.

Delivery Time

Shipping Timeline listed above is an estimate. Please call or message the web chat for precise ETAs.

Fortress Power DuraRack - The Ultimate Energy Storage Enclosure - Data Sheet / Manual

Fortify your energy system with the robust Fortress Power DuraRack, the ideal indoor/outdoor enclosure designed for both expansion and resilience. The DuraRack, crafted from durable iron, is engineered to securely house up to 4 eFlex 5.4kWh batteries, with the capability to expand to 4 units—accommodating a total of 15 eFlex batteries or 81kWh. It's the perfect blend of strength and versatility for your energy storage needs.

Equipped with integrated busbars and pre-configured for a DIN rail heater mount, this enclosure streamlines the setup process, making installation straightforward in any environment. Whether you're setting it up as a free-standing unit or mounting it on a pad, the DuraRack’s safety features are uncompromised, boasting IP65 water and dust resistance for protection against the elements.

The DuraRack is not just an enclosure; it’s a modular energy hub. It's designed to integrate seamlessly with the FlexTower system, supporting up to a 15kW inverter in the upper cabinet, while the lower cabinet is specifically tailored for battery storage. NEMA3R rated and a part of the eFlex UL9540 large-scale fire testing, this cabinet promises peace of mind through rigorous safety standards.

Including a combiner busbar, battery-to-busbar cables, and provisions for inverter cabinet cooling fan control, the DuraRack is ready to support your energy system's growth. With options for cold climate adaptation via DIN rail thermostat and passive cooling vents for warm climates, it’s tailored to operate efficiently regardless of your location.

DuraRack Specifications
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 1 inch & 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