Original price
$1,485.00
-Original price
$1,485.00
Original price
$1,485.00
$1,485.00-$1,485.00
Current price
$1,485.00
| /
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5.4–81kWh · Expandable Enclosure
Fortress Power DuraRack: Expandable Battery Enclosure for eFlex Batteries
The DuraRack is an all-weather steel enclosure that holds up to 4 Fortress Power eFlex or eFlex MAX batteries, with integrated busbars and battery cables already wired in.
Link up to 4 units together for up to 15 batteries and 81kWh total, so a system that starts small has a clear path to grow.
3-Year Warranty
Lowest Price Guarantee
Authorized Fortress Power Dealer
Free Shipping
0% APR Financing
Expert Support: (303) 876-7654
Why the DuraRack
Holds Up to 4 eFlex Batteries Per Unit
Each DuraRack cabinet holds up to 4 eFlex or eFlex MAX batteries — 5.4kWh to 21.6kWh per unit depending on how many you install.
Expandable to 81kWh
Link up to 4 DuraRack units together for up to 15 eFlex batteries and 81kWh total — a clear expansion path as your storage needs grow.
Pre-Wired Busbars and Cables
Ships with integrated busbars and battery cables already installed, so adding batteries doesn't mean running new wiring for each one.
DIN Rail Heater Mount
An easy mounting point for a DIN rail thermostat/heater in cold climates, plus a passive cooling vent for warm ones.
Free-Standing or Pad-Mounted
Install it free-standing or pad-mounted, indoors or outdoors, to fit the site you actually have.
All-Weather Steel Enclosure
A carbon steel enclosure built for both indoor and outdoor installations.
eFlex or eFlex MAX batteries and inverter sold separately.
Full Specifications
Model
Fortress Power DuraRack
Storage Capacity Range (per unit)
5.4kWh – 21.6kWh (holds up to 4 eFlex or eFlex MAX batteries)
Max Expansion
Up to 4 units linked (15 eFlex batteries, 81kWh total)
Material
Carbon steel
Color
White
Mounting
Free-standing or pad-mounted, indoor or outdoor
Included Hardware
Integrated busbars and battery cables, DIN rail heater mount, passive cooling vent
Ingress Protection
Fortress Power's own materials list this two ways — IP65 on the datasheet PDF, IP54 on the current product page. We'd rather flag the discrepancy than assert either figure — call us to confirm the exact rating for your installation.
Dimensions
Approx. 29.3–29.9"W × 41.3–42.0"H × 17.8–18.0"D (Fortress Power's datasheet and product page differ slightly on exact figures)
Weight
153.2 lb
Warranty
3 years
Batteries Sold Separately
Compatible with eFlex 5.4kWh and eFlex MAX 5.4kWh batteries
Authorized Fortress Power Dealer
We sell genuine Fortress Power products backed by Fortress Power's own warranty.
Lowest Price Guarantee
Find it cheaper from another authorized dealer? Call (303) 876-7654 before you order.
Real Support, Not a Ticket Queue
Sizing a system or checking inverter compatibility? Call (303) 876-7654 and talk to a person.
Fortress Power DuraRack: Expandable Battery Enclosure for eFlex Batteries: Frequently Asked Questions
Does the DuraRack come with batteries included?
No — the DuraRack is the enclosure and wiring only. It's designed to hold up to 4 eFlex or eFlex MAX 5.4kWh batteries, which are sold separately.
How much can this system expand to?
One DuraRack holds up to 4 batteries (up to 21.6kWh), and you can link up to 4 DuraRack units together for 15 eFlex batteries and 81kWh total.
What's the actual ingress protection rating — IP65 or IP54?
Fortress Power's own materials list this two different ways: the datasheet PDF says IP65, the current product page says IP54. We don't want to publish a number we can't stand behind — call (303) 876-7654 and we'll get written confirmation before you order.
Can I install this outdoors?
Yes, it's rated safe for both indoor and outdoor installation, free-standing or pad-mounted.
What's the difference between the DuraRack and the FlexTower?
The DuraRack is an empty enclosure for eFlex batteries — you add the batteries and a separate inverter. The FlexTower is built on the same cabinet but comes pre-wired with a battery, inverter, charge controller, and LCD panel already integrated.
Can I install this myself, or do I need an electrician?
Fortress Power's equipment is designed for professional installation. We strongly recommend a licensed electrician or solar installer for any battery, inverter, or enclosure installation — call (303) 876-7654 if you need a referral in your area.
Do you offer financing or price matching?
Yes. We offer 0% APR financing options through Affirm at checkout, and our Lowest Price Guarantee applies — if you find this product cheaper at another authorized Fortress Power dealer, call us at (303) 876-7654 before you order and we'll take care of it.
