Fortress FlexTower Houses Your Envy and eFlex Batteries Together
The Fortress Power FlexTower is an all-in-one cabinet that brings an Envy inverter and up to four eFlex or eFlex MAX 5.4kWh batteries together in one tidy, IP54-rated tower. The lower DuraRack section holds the batteries with integrated busbars and battery cables, and the upper FlexTower cabinet mounts the inverter, with side knockouts sized for solar, grid and generator wiring. It works indoors or outdoors.
Why You'll Love The Fortress FlexTower Cabinet
One clean tower. Inverter and up to four batteries in a single 29.2 x 83.78 x 17.8 in footprint.
Faster wiring. Side knockouts sized for solar, grid and generator, plus included battery cables with Anderson connectors and a combiner.
Indoor or outdoor. IP54 rated with fan cooling and support for DIN-rail heaters in cold climates.
Fits common inverters. Fortress says the FlexTower fits most 48V inverters, with Envy and Sol-Ark mounting positions labeled.
Your life, with the Fortress FlexTower Cabinet
Instead of a wall full of boxes and conduit, your garage has one neat tower. The inverter, batteries and wiring are all inside, protected and easy to service.
The Fortress FlexTower Cabinet in a nutshell
Battery and inverter in one
Holds an Envy inverter and up to four eFlex or eFlex MAX 5.4kWh batteries.
IP54 enclosure
Rated for indoor and outdoor installation, 32 to 114°F operating range.
Cables included
Battery cables with Anderson connectors and a combiner come with the cabinet.
Cold-climate ready
Compatible with DIN-rail heaters to help maximize battery life in cold weather.
Fortress FlexTower Cabinet specifications
FlexTower
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Model: FLEXTOWER
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Operating temperature: 32 to 114°F (0 to 45°C)
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IP rating: IP54
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Enclosure weight: 265 lb (120 kg)
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Dimensions (W x H x D): 29.2 x 83.78 x 17.8 in (742 x 2128 x 452 mm)
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Cooling: Fan
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Side knockouts: Left 2 in (3), 1.5 in (1), 1.25 in (1), 1 in (1); right 2 in (3), 1.5 in (1), 1 in (1)
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Warranty: 3 years
DuraRack battery section
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Capacity: Up to 4 eFlex or eFlex MAX 5.4kWh (5.4 to 21.6kWh)
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Battery busbars: 2 x 4 points, M8 (5/16) terminal rings
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Busbars to inverter: 2 points, M10 (3/8) terminal rings
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Battery cables: 4 sets of + and - #4 cables with Anderson connectors
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Terminal torque: 7.0 to 7.7 Nm (5.1 to 5.7 ft-lb)
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Certifications: UL9540, UL9540A, UL1973, CEC, SGIP
Let the experts help you find your perfect Fortress FlexTower Cabinet setup
Planning an Envy and eFlex system? Tell us your loads and backup goals and we will spec the FlexTower, batteries and inverter together.
Email support@kratopower.com or call +1 888-855-7286.
Fortress FlexTower Cabinet documents and materials
Safety disclaimer: Battery and inverter cabinets house high-energy DC and AC equipment. Installation should be carried out by a licensed electrician in line with local electrical and fire codes and the manufacturer's manual. You use this product at your own risk. The content on this page is general product information, not professional or medical advice. If you have any doubt, consult a qualified professional.
