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Table of Contents
About Fortress Power .................................................................................................................................... 2
About FlexTower All-In-One Cabinet ............................................................................................................. 2
General Safety Precautions and Safety Instructions ..................................................................................... 3
Transportation and Handling ......................................................................................................................... 4
Response To Emergency Situations ............................................................................................................... 4
Required Tools & Materials ........................................................................................................................... 5
Included with FlexTower................................................................................................................................ 6
FlexRack Installation Steps ............................................................................................................................ 7
Multiple FlexTowers / Spacing Requirements ............................................................................................. 14
Torque Specifications .................................................................................................................................. 15
Inverter Programming ................................................................................................................................. 15
Grounding and Stability ........................................................................................................................... 16
External Views.............................................................................................................................................. 18
Wire Sizing ................................................................................................................................................... 18
Heating for Flextower .................................................................................................................................. 20
Fan Maintenance ......................................................................................................................................... 21
Operating Temperatures ............................................................................................................................. 22
Storage and Self-Discharge .......................................................................................................................... 22
SolArk 15kW Wire Diagram Example........................................................................................................... 23
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Summary of Contents for Fortress Power FlexTower DuraRack
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Page 1: Table Of Contents
Table of Contents About Fortress Power ............................ 2 About FlexTower All-In-One Cabinet ......................2 General Safety Precautions and Safety Instructions ..................3 Transportation and Handling ......................... 4 Response To Emergency Situations ....................... 4 Required Tools & Materials ........................... 5 Included with FlexTower..........................6 FlexRack Installation Steps .......................... -
Page 2: About Fortress Power
About Fortress Power Our mission is to provide compact, user-friendly, and affordable energy storage solutions using the latest technology for all homes and businesses. Fortress solar energy storage batteries can easily integrate with new and existing PV systems and work with a wide range of existing inverter and charge controller manufacturers for ease in system design. -
Page 3: General Safety Precautions And Safety Instructions
General Safety Precautions and Instructions All types of damage to the product may lead to a leakage of electrolyte or flammable gas. During installation of the battery, the utility grid, solar input must be disconnected from the Battery Pack wiring. Wiring must be carried out by qualified personnel. -
Page 4: Transportation And Handling
Response To Emergency Situations The battery pack consists of multiple batteries and a sophisticated Battery Management System that are designed to prevent hazards resulting from failures. However, Fortress Power cannot guarantee their absolute safety. • Leaking Batteries • If the battery pack leaks electrolyte, avoid contact with the leaking liquid or gas. If a person is exposed to the leaked substance, immediately perform the actions described below. -
Page 5: Required Tools & Materials
Required Tools & Materials The following tools and materials are required: • Positive battery-combiner-to-inverter cable – 22.5” flexible 2/0 AWG • Negative battery-combiner-to-inverter cable – 24” flexible 2/0 AWG • 2/0 Crimp Terminal lugs for above cables with ring size of 3/8ths or larger •... -
Page 6: Included With Flextower
Included with FlexTower FlexTower Upper Inverter Cabinet fasteners for upper and lower inverter mounting rails FlexTower Lower Inverter Cabinet (DuraRack) 4 x red and black battery cables 2 x battery combiner blocks with 3 mounting ring terminal + bolts and 2 x low amperage connections (for DC fan + fan controls) 2 x din rails + bolts for din rail mounting 4 x floor mount expansion bolts... -
Page 7: Flexrack Installation Steps
Open boxes and confirm all components are included and in working order. Contact Fortress power if the box is damaged prior to opening. Open box, Tilt Box on edge with top side up then slide out of box. The rack boxes are heavy [lower cabinet (DuraRack) 150 pounds, upper cabinet (FlexTower) 134 pounds]. - Page 8 Install at desired location. The FlexTower is designed to be pad or floor mounted. There are 4 mounting holes provided, along with M10 masonry sleave anchor bolts and nuts. Note the location of external grounding tabs on both sides of the lower battery cabinet. A 3”...
- Page 9 The DuraRack cabinet contains a floor plate that allows for ground mounting using M10 bolts. 3. Set the cabinets on top of each other. When installing the upper battery cabinet on top of the lower battery cabinet, remove the two top watertight feedthrough covers on the lower cabinet, using a razor knife on cabinet gromet.
- Page 10 Connect the included battery-to-combiner power cables to the busbar, if not pre-wired. Use red for positive and black for negative, taking care not to reverse these cables. If the battery-to- busbar power cables are pre-wired, remove any cables which will not be used. Only install the correct number of battery cables, equal to the number of eFlex batteries.
- Page 11 The DC fan power cables are also powered by the battery. The entire system has a 48V DC power lead which is to be routed through the FlexTower to land on the busbar terminals inside the lower battery cabinet.
- Page 12 Install, wire, and secure the eFlex batteries. Up to four batteries can be installed using the supplied mounting brackets. The batteries each weigh over 100 pounds and the Dura Rack has limited space. Wire each eFlex at an angle, as it is being placed into the cabinet.
- Page 13 15k inverter. Some inverter mounting plates may require custom attachment to the back inverter support rails. Commissioning the System Fortress Power maintains documentation on its batteries and inverters within its Product Manuals, which can be found at https://support.fortresspower.com When using a 3 party inverter, please refer to our Inverter Guides, also found on the Fortress Power support page linked above.
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Page 14: Multiple Flextowers / Spacing Requirements
Multiple FlexTowers / Spacing Requirements The Flextower is a NEMA3R cabinet which be stacked adjacent to other FlexTower units including just the lower battery cabinet (i.e. the DuraRack). The internal battery combiner block is rated for 500A and intended for direct paralleling of up to two battery cabinets. -
Page 15: Torque Specifications
Torque Specifications **Please note: Battery to inverter cables are for 3/8 ring crimp lug Please use the following Torque Values for the above steps: Bolting Specification Torque Value (Nm) M4*8 exagon socket screw 1.0~1.8 M6*15 Ground Bolt 3.6~4.8 M8*20 Combining Screw 9.8~12 M10 Expansion Bolt 19.6~32.2... -
Page 16: Grounding And Stability
Grounding and Stability Grounding Method Grounding tabs are located both inside and outside the lower battery cabinet. The green bonding cables are placed on cabinet doors to bond the doors to the rest of the cabinet. The FlexTower upper cabinet is bonded to the DuraRack via an included bonding jumper. -
Page 18: External Views
External Views Wire Sizing The FlexTower includes a 500A busbar as well as #4 AWG Flexible Cable sized for each eFlex battery. Installers should use flexible cable if installing their own battery cable. The combiner- to-inverter run should be a minimum of 2/0 flexible cable, or 1/0 when a single inverter requires parallel conductors (4/0) Refer to the Inverter Guide and Product Manual eFlex 5.4 for the battery operation and maintenance information. -
Page 20: Heating For Flextower
Heating for Flextower Heating must be added to the lower cabinet should if installed in environments which fall below sustained temperatures of 40F during the year to avoid throttling back or disconnection of battery power. The colder environments, the larger and more important the need for external heating. AC-din rail heating options An easy heating option is to route 120V AC power circuit to the lower battery cabinet Example:... -
Page 21: Fan Maintenance
Fan Maintenance The FlexTower Upper Cabinet holds two vents for air circulation inside the FlexTower. The filters are placed in the interior to filter out dust as air enters the cabinet. For every two years, please visually inspect the filters for dust and clean or replace if necessary. Confirm that the pair of ventilation fans are in working order. -
Page 22: Operating Temperatures
Operating Temperatures Fortress batteries will charge at 32°F or above and discharge at -4°F or above when powered on. Cold operation reduces battery life, and so Fortress batteries will de-rate charging and discharging when internal battery temperature drops below 50°F. Relative humidity should be kept to less than 95%. Storage and Self-Discharge Leaving a system powered on, in operation, is not the same as leaving the system in storage. -
Page 23: Solark 15Kw Wire Diagram Example
SolArk 15kW Wire Diagram Example... - Page 24 Ribbon strap instructions: DuraRack Ribbon Strap Installation Video i) Insert shelf clip into back of cabinet, threading the orange strap through the clip ii) Install eFlex with terminals pointing towards the combiner block location (the Fortress Logo will be upright). The orange strap will go over the top of the eFlex on both passes.
- Page 25 iv) Lace the stability buckle through the orange strap and tighten. Note on FlexTower DC fan power supply for early shipments: The Flextower cabinets include a DC fan which runs off the battery voltage. However, the busbars for the first shipment Flextowers do not include mounting locations for the fans.
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