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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.
Enclosure Options:
- Inverter Enclosure: Outdoor rated enclosure to hold Envy and Sol-ark inverter
- Inverter & Battery Enclosure: Top enclosure holds Envy & Sol-Ark inverter, Bottom enclosure: DuraRack; holds up to 4 eFlex units
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
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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 |
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FlexTower Data Sheet
FlexTower Installation Manual
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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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