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Fortress Power FlexTower with DuraRack & 3 eFlex Batteries 16.2kWh

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The FlexTower is an all-in-one 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.

*Combines Sol-Ark 12K/15K (inverters sold separately)

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 Plan

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


  • Manufacturer: Fortress Power
  • Model: FlexTower without Inverter - 3 eFlex Units
  • Rated Power Output [W]: 1
  • Length [mm (in)]: 2019 mm (79.5 in)
  • Width [mm (in)]: 744 mm (29.3 in)
  • Depth [mm (in)]: 449 mm (17.7 in)
  • Weight [kg (lb)]: 336.6 kg (742.2 lbs)
  • Warranty [Years]: 10

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