FlexTower
Full-System Enclosure

The FlexTower is for your integrated energy storage system. Built on the foundation of the DuraRack battery cabinet, the FlexTower combines the battery, charge controller, and inverter into a single unit with an LCD control panel, and remote monitoring capability. The FlexTower is easy to install and carries IP65/NEMA3R ratings for indoor or outdoor use.

• FlexTower Data Sheet | Download
• FlexTower Installation Manual | Download
• Flextower/Durarack UL9540 | Download

All-in-One Solution

• Inverter, charge controller, LCD Control Panel, Battery and remote monitoring app integrated in one unit
• Supports Off-grid, Back-up, Zero Export, Time-of-Use, Demand Response, Peak Shaving, and Virtual Power Plant

Flexible & Easy Install

• IP65 water and dust proof for indoor & outdoor installation. NEMA3R
• AC or DC couple to existing or new PV arrays
• Optional Rapid Shutdown Button Included
• Side knockouts sized for solar, grid, and generator wiring

Highest Reliability for Maximal Protection

• 8000+ cycle life with tier 1 Automotive Lithium Iron Phosphate (LFP) battery
• Easily scaled to meet all large residential and commercial electricity needs

Whole Home Backup with 200A Grid Pass-through

• 200A Pass-through eliminates backup panel requirement
• Saves time on inverter wiring
• Includes battery cables and combiner for additional savings

Highest Roundtrip Efficiency to Maximize Your Solar Investment

• >98% Battery Efficiency
• 5% CEC-Rated Inverter Efficiency
• Compatible with Din-Rail Heaters to maximize lifecycles in cold climates

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	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

Product Reviews