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Elevate your energy independence with the ultimate power bundle. Our FlexTower, equipped with the DuraRack battery cabinet, combines an all-in-one energy storage system with an Envy True 12 kW inverter and three to four eFlex 5.4 kWh batteries. Whether your goal is to maintain home power during an outage or decrease your grid dependency, the FlexTower with Envy True 12 kW Inverter and eFlex batteries bundle offers the ideal solution.
FlexTower
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.
Key Features:
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
Envy True 12 kWh Inverter
The Fortress Power Envy True 12 kW – a whole-home, all-in-one 12kW inverter solution. Paired with the Fortress Power eFlex 5.4 kWh, the eVault Max 18.5 kWh, or LEP-10 MAX batteries, the Envy features a 200A AC passthrough providing up to 12kW (50A @ 240V) of whole-home backup power. The Envy features a built-in generator input with AC/DC coupling, on- and off-grid capabilities, plus a 3 MPPT output allowing for a maximum of 21 kW PV array. The Envy is equipped with a built-in APsmart Module Level Rapid Shutdown Transmitter and Button, along with Pre-built AC & DC breakers allowing for fast installation and commissioning. Use our online monitoring app to access your system from anywhere.
Key Features:
- 200A AC Passthrough Current For Whole Home Backup
- 3 MPPT Output For Max. 21 KW PV Array
- AC, DC And AC/DC Combined Coupling
- IP65 Rated For Indoor & Outdoor Installation
- Built-In Generator Input
- 10 Units In Parallel
- Local And Remote Monitoring/App
- Color LCD Touch Screen
- Batch Settings
Supported Applications:
- Backup
- Off-Grid
- Zero Export
- Time-Of-Use
- Peak Shaving
- Demand Response Integration (Coming Soon)
Whole-Home Backup/AC Passthrough One-Line Diagram
eFlex 5.4 kWH LFP Battery
The Fortress Power eFlex is a 5.4 kWh scalable energy storage solution based on safe and energy dense prismatic Lithium Iron Phosphate cells. The digital processor Battery Management System (BMS) includes high amperage contactor disconnects and advanced Closed-Loop inverter communication, as well as individual cell voltage monitoring, temperature monitoring, and cell balancing to maximize reliability and longevity.
Canbus, modbus, and wifi communication enable internet-of-things compatibility. The IP65 case ensures direct water spray and dust will not penetrate the battery internals from all directions. The unit can be wall mounted, floor mounted, and server rack mounted for hard-to-reach access in renewable, marine, RV, mobile, telecom, railway applications and more.
Key Features:
- Rugged, Long-lasting, Daily Use Battery
- Safe Lithium Iron Phosphate Technology (LifeP04)
- 98% Round Trip Efficiency
- Flexible Mounting Options
- Remote Monitoring including wifi, modbus, and canbus
- BMS Monitors & Balances Individual Cells
- NRTL certified to UL9540 and UL9540a standards
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| 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 |
Envy True 12 kWh Inverter
Input DC (PV Side) |
| Max. DC Input Power for Single MPPT |
12000W/7000W/7000W 1 x 12kW, 2 x 7kW |
| Max. PV Input Power |
21000W |
| Max. PV Power Delivered to Battery & AC Outputs |
18000W |
| DC Input Voltage Range |
100V-600V |
| Nominal DC Input Voltage |
360V |
| Full Power MPPT Voltage Range |
230V-500V |
| Max. DC Input Current |
25A/15A/15A |
| MPPT Number/(Strings per MPPT) |
3(2/1/1) |
| Output/Input AC (Grid) |
| Continuous AC Power to Grid |
12000W (240V) |
| Continuous AC Power to Load with Grid or Generator |
48000W (240V) |
| Nominal Output Voltage |
120V/240V |
| Max. Continuous AC Current |
50A @ 240V |
| Nominal AC Frequency |
50Hz/60Hz |
| Output AC (Off-Grid) |
| Max. Output Power |
12000W (240V) |
| Nominal Output Voltage |
120V/240V |
| Nominal Output Frequency |
50Hz/60hZ |
| Nominal Output Current |
50A @ 240V |
| Peak Power |
14kW 10 minutes / 16kW 5 minutes / 20kW 500ms |
| Switching Time |
Seamless
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| Battery Parameters |
| Compatible Battery Type |
Lithium and Lead acid batteries |
| Nominal Battery Voltage |
48V |
| Battery Voltage Range |
48V-56V |
| Maximum Charging/Discharging Current |
250A |
| Maximum Charging/Discharging Power |
12000W |
| Efficiency |
| MPPT Efficiency |
99.9% |
| Max. Efficiency |
97.5% |
| CEC Efficiency |
96.5% |
| Protection |
| Anti-islanding Protection |
YES |
| DC Switch |
YES |
| Ingress Protect Degree |
NEMA 4X, IP65 |
| SPD Protection |
YES |
| AFCI |
OPT |
| RSD |
Built-in APsmart Transmitter |
| General Data |
| Dimensions |
31.1 x 20.5 x 10.4 in (790 x 520 x 264 mm) |
| Weight |
127 lbs (58 kg) |
| Display |
Color LCD |
| Ambient Temperature Range |
-20 to 60 °C (-4 to 140 °F) |
| Cooling |
FAN |
| Communication |
RS485/Wi-Fi/CAN |
| Standard & Certification |
| Certifications |
UL1741, UL1741SB, IEEE1547A, Rule 21, ISO-NE, FCC15 class B, HECO, CEC, Luma, SGIP, NOM |
| Warranty |
10 Years / Lead Acid or Fortress Lithium Batteries , other 48v battery manufacturers**
** BATTERIES TO BE CONFIGURED IN OPEN LOOP COMMUNICATION
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| eFlex 5.4kWh LFP Battery |
| Name |
eFlex 5.4 |
| Total Energy(kWh) |
5.4 |
| Max. Charge Current (Continuous) [A] |
100 |
| Max. Discharge Current (Continuous) [A] |
60 |
| Max. Pulse Current (for 5 sec) [A] |
130 |
| Capacity [Ah] |
105 |
| Voltage Range [V] |
48-55 |
| Charging Temperature [F] |
32 to 113 |
| Discharging Temperature [F] |
32 to 140 |
| Storage Temperature [F] |
32 to 95 |
| Dimension [L x W x H, inch] |
21.5 x 17.5 x 7.2 |
| Weight [lbs] |
116 |
| Life Cycles |
8000 @ 80% DoD |
| Round Trip Efficiency |
>98% |
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FlexTower
FlexTower Data Sheet
FlexTower Installation Manual
Envy True 12 kW Inverter
Envy True 12 kW Inverter - Warranty
Envy True 12 kW Inverter - Data Sheet
Envy True 12 kW Inverter - Manual
Envy Battery - Inverter Integration Guide
Fortress Power System Design Tool
Envy Inverter Monitoring Setup Guide
OGPe Certification
NOM Certification
eFlex 5.4 kWH LFP Battery
Data Sheets
eFlex Data Sheet
eFlex Data Sheet (Spanish)
eFlex Brochure (Spanish)
Installation Guides/Warranty
eFlex Warranty
eFlex Owner/Installation Manual
Inverter Guides
Firmware
Certifications
UL9540/UL1973 Certificate
UL9540a Large Scale Fire Test Report
Racking Details
DuraRack Manual
Customer Server Rack Guide
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Shipping is typically through freight carriers and the actual shipping time is contingent on your location and the specific warehouse dispatching your order. Please allow for a 1-3 business day processing period before shipment, and an estimated delivery time of up to 7 business days. Your confirmation email will include delivery details and we will send you a tracking number as soon as one is available. If you ordered several separate items, you may receive multiple tracking numbers. Once the item has been shipped, the freight service will contact you to coordinate the date and time of delivery. If you require any special accommodations during delivery please let us know as soon as possible and let the delivery company know when arranging the appointment.
Typically, orders will be dropped off either curbside or outside your front door or garage. It is your responsibility to bring the order inside or to its final destination and to remove any existing items.
Depending on the item, parts may be shipped in multiple boxes, and assembly may be required. When your order is delivered, please check that you have all pieces of the item and that nothing is damaged. If your order is damaged during transit and external damage is visible, note the damage immediately, write it on the delivery documents, take photos and/or videos, and refuse shipment. If there is no visible external damage, accept the package but note “subject to concealed damage” on the delivery documents. Any damage upon delivery needs to be reported within 24 hours of delivery or you may not be eligible for a refund. For additional information on submitting claims, as well as incorrect item exchanges, and replacements, please see our Refund Policy.
For more information about shipping, please visit our complete Shipping Policy.
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