Fortress-Power-DuraRack-eFlex_1 Fortress Power | DuraRack + eFlex $13,375.00
fortress power|SKU:12994848731-var-61766-ed7e49

Fortress Power | FlexTower + 12k Inverter + eFlex Batteries

Grid-Independent Power in One Integrated Tower

The Fortress Power FlexTower with 12k Inverter and eFlex Batteries represents the pinnacle of integrated energy storage, delivering a seamless, premium power solution for your home. Experience uncompromising reliability and effortless control with a single, elegantly unified system designed for both indoor and outdoor installation. Elevate your energy independence with a sophisticated system that combines advanced monitoring with robust, all-weather performance.

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304 stainless steel construction — rust-resistant, built to last decades
Ships fully assembled — wheel it out, fire it up same day
10-year warranty standard — industry-leading coverage on all burners

Price range: $15,488.95 through $18,226.95

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Fortress Power | FlexTower + 12k Inverter + eFlex Batteries
$15,488.95 – $18,226.95Price range: $15,488.95 through $18,226.95

Grid-Independent Power in One Integrated Tower

The Fortress Power FlexTower is a vetted, off-grid proven energy storage system that consolidates your 12k inverter, charge controller, and eFlex LFP batteries into a single weather-rated tower. Built on the DuraRack platform with IP65/NEMA3R protection, this investment handles off-grid living, whole home backup, peak shaving, and virtual power plant participation. With 8,000+ cycle life from tier 1 automotive-grade LFP cells, it scales for residential or commercial demand. Ships free with 30-day hassle-free returns. Financing available.

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All-in-One Design
IP65/NEMA3R Rated
8000+ Cycle LFP
200A Whole Home Backup
8000+
Cycle Life
12k
Inverter Output
200A
Grid Integration
Fortress-Power-FlexTower-12k-Inverter-eFlex-Batteries

Feature. . This ensures long-lasting durability and consistent performance in demanding conditions. Professional-grade materials and expert engineering come together to deliver a product you can rely on day after day, job after job. Every detail has been carefully considered to maximize your satisfaction and minimize downtime.

Fortress-Power-FlexTower-12k-Inverter-eFlex-Batteries-2

Feature. . This ensures long-lasting durability and consistent performance in demanding conditions. Professional-grade materials and expert engineering come together to deliver a product you can rely on day after day, job after job. Every detail has been carefully considered to maximize your satisfaction and minimize downtime.

Fortress-Power-FlexTower-12k-Inverter-eFlex-Batteries-3

Feature. . This ensures long-lasting durability and consistent performance in demanding conditions. Professional-grade materials and expert engineering come together to deliver a product you can rely on day after day, job after job. Every detail has been carefully considered to maximize your satisfaction and minimize downtime.

Is the FlexTower Right for Your Setup?

Confirm your site meets these conditions before ordering.

  • Indoor or outdoor mounting area meeting IP65/NEMA3R environmental available
  • AC or DC coupled PV array compatible with side knockout wiring access
  • 200A grid panel available for whole home backup integration

Where the FlexTower Delivers

One tower, multiple applications — built for real demand.

Whole Home Backup
Off-Grid Cabin Power
Peak Shaving & TOU Savings

Full specifications

At a glance

Dimensions
See product page
Warranty
See product page
Full specifications10 data points across 4 categories

Dimensions

Overall DimensionsSee product page
WeightSee product page

Power & Performance

Inverter12k
Battery Cycle Life8000+
Battery ChemistryTier 1 Automotive Lithium Iron Phosphate (LFP)
Battery Options3 eFlex Batteries, 4 eFlex Batteries

Materials

Battery CabinetDuraRack

Compliance & Warranty

Ingress ProtectionIP65
NEMA RatingNEMA3R
WarrantySee product page

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Every product we carry earns its place on our shelf.

Vetted for Real PerformanceWe verify specs, build quality, and warranty support before a product ever makes the cut.
Free ShippingEvery order ships free — no minimums, no fine print, no thresholds.
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★★★★★
“Outstanding quality and performance. The Fortress exceeded my expectations in every way.”
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First L.United States

Fortress Power | FlexTower + 12k Inverter + eFlex Batteries

Price: $15,488.95 | Category: Batteries

Experience the pinnacle of residential and light-commercial energy independence with the Fortress Power FlexTower. This all-in-one energy storage system seamlessly integrates a high-performance inverter, robust battery storage, and an advanced charge controller into a single, weather-resistant unit. Designed for both indoor and outdoor installation with an IP65/NEMA3R rating, the FlexTower delivers whole-home backup, grid-interactive functionality, and intelligent energy management. Whether you are seeking off-grid autonomy, backup power, or maximizing your solar investment, the FlexTower provides a scalable, premium solution with an impressive 8,000+ cycle life and industry-leading efficiency.

Key Features

  • All-in-One Solution: Integrates inverter, charge controller, LCD Control Panel, battery, and remote monitoring app into a single, streamlined unit.
  • Advanced Grid Management: Supports Off-grid, Back-up, Zero Export, Time-of-Use, Demand Response, Peak Shaving, and Virtual Power Plant modes.
  • Flexible & Easy Install: IP65 water and dust proof for indoor & outdoor installation (NEMA3R rated). AC or DC couple to existing or new PV arrays. Optional Rapid Shutdown Button included.
  • Simplified Wiring: Side knockouts sized for solar, grid, and generator wiring. Includes battery cables and combiner for additional savings.
  • Highest Reliability: 8,000+ 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: 200A Grid Pass-through eliminates the need for a separate backup panel, saving time on inverter wiring.
  • Maximum Efficiency: >98% Battery Efficiency and 5% CEC-Rated Inverter Efficiency to maximize your solar investment.
  • Cold Climate Ready: Compatible with Din-Rail Heaters to maximize lifecycles in cold climates.

Specifications

  • System Type: All-in-One Energy Storage System (FlexTower + 12k Inverter)
  • Battery Chemistry: Tier 1 Automotive Lithium Iron Phosphate (LFP)
  • Battery Cycle Life: 8,000+ cycles
  • Inverter Power: 12kW
  • Grid Pass-through: 200A
  • Enclosure Ratings: IP65 / NEMA3R (Indoor & Outdoor)
  • Battery Efficiency: >98%
  • Inverter Efficiency: 5% CEC-Rated
  • Monitoring: Remote monitoring via app, LCD Control Panel
  • Operating Modes: Off-grid, Back-up, Zero Export, Time-of-Use, Demand Response, Peak Shaving, Virtual Power Plant
  • Coupling: AC or DC coupling to PV arrays
  • Included Accessories: Battery cables, combiner, optional Rapid Shutdown Button
  • Optional Accessory: Din-Rail Heaters (for cold climates)
  • eFlex Batteries Included: Choose between 3 eFlex Batteries or 4 eFlex Batteries (select at checkout)

Why Choose Fortress Power | FlexTower + 12k Inverter + eFlex Batteries

When you invest in the Fortress Power FlexTower, you are choosing a system engineered for longevity, simplicity, and peak performance. Unlike fragmented setups that require multiple components and complex wiring, the FlexTower delivers a truly integrated experience. The combination of a robust 12kW inverter with high-efficiency eFlex LFP batteries ensures you have reliable power for whole-home backup or commercial applications. With an 8,000+ cycle life, this system is built to last decades, not years. The IP65/NEMA3R rating gives you the freedom to install it virtually anywhere—garage, basement, or outdoors—without worrying about the elements. Plus, features like 200A grid pass-through, zero export capability, and remote monitoring put you in total control of your energy future. Backed by Fortress Power’s reputation for quality and innovation, the FlexTower is the smartest path to energy independence, lower utility bills, and peace of mind.

Additional information

Amount of eFlex Batteries

3 eFlex Batteries, 4 eFlex Batteries

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Frequently Asked Questions

The FlexTower ships as a pre-configured unit combining inverter, charge controller, and eFlex batteries in a DuraRack cabinet. Some assembly is needed for wiring connections via side knockouts designed for solar, grid, and generator cables. The system includes battery cables and a combiner for convenience. Professional installation is recommended due to electrical complexity.
Yes, the FlexTower supports both AC and DC coupling to new or existing PV arrays. It also features side knockouts for solar, grid, and generator wiring, making it adaptable to various setups. The 200A grid pass-through allows whole-home backup without a separate subpanel, simplifying integration with most residential electrical systems.
The system uses tier 1 Automotive Lithium Iron Phosphate (LFP) batteries, offering over 8,000 cycles with >98% battery efficiency. This chemistry provides long lifespan, safety, and reliable performance. The batteries are housed within the FlexTower and are designed for high-cycle residential or commercial use.
Minimal maintenance is needed due to the sealed IP65/NEMA3R enclosure and LFP battery chemistry. The system includes remote monitoring and an LCD control panel to track performance. For cold climates, optional din-rail heaters can maximize battery lifecycles. Periodic inspection of connections and ventilation is recommended.
Returns and warranty terms are not specified in the product data. Please contact our support team for detailed information on return eligibility, restocking fees, and warranty coverage for the FlexTower, inverter, and eFlex batteries. We recommend reviewing the manufacturer’s warranty documentation before purchase.
This system is ideal for homeowners or businesses needing whole-home backup, off-grid power, or advanced energy management. It supports modes like zero export, time-of-use, peak shaving, and virtual power plant. With IP65 rating, it suits both indoor and outdoor installations, and its 200A pass-through eliminates the need for a backup panel.
Yes, the FlexTower is easily scalable to meet large residential and commercial electricity demands. Its modular design allows adding more eFlex batteries or additional units. The system supports various operating modes, including demand response and peak shaving, making it flexible for growing energy requirements.
SKU: 12994848731 Categories: , Brand:

The Off Grid Vault Promise

Every product we carry earns its place on our shelf.

Vetted for Real Performance We verify specs, build quality, and warranty support before a product ever makes the cut.
Free Shipping Every order ships free — no minimums, no fine print, no thresholds.
30-Day Hassle-Free Returns If it doesn't meet your standards, send it back within 30 days.

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About fortress power Batteries

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