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FORTRESS EFLEX 5.4 kWh LITHIUM BATTERY INSTALLATION MANUAL 

SECURE YOUR ENERGY WITH FORTRESS LITHIUM BATTERY SYSTEMS 

 

Fortress 

battery 

systems 

utilize 

the 

industry’s  most  environmentally  benign 
chemistry-  Lithium  Ferro  Phosphate  (LFP), 
which  eliminates  operating  temperature 
constraints,  toxic  coolants,  and  the  risk  of 
thermal runaway and fire. The built-in smart 
Battery 

Management 

System 

(BMS) 

integrates 

multilevel 

safety 

concepts: 

Overcharge and Deep Discharge Protection; 
Voltage and Temperature Observation; Cell 
balancing.

 

Fortress high-performance Lithium Batteries 
are  manufactured  at  the  highest  quality 
standards.  It  comes  with  large  power 
capacity and a fast charging and continuous 
discharge power. LFP Chemistry also has nearly twice the cycle life of other Lithium technologies such 
as NMC.    The proprietary architecture and BMS eliminate the need for cooling or ventilation, which 
creates a 98% efficient round-trip conversion of energy. 

The Fortress eFlex is safe, easy to install, consistently reliable, and highly efficient. It provides you with 
the lowest lifetime energy storage cost.   

This installation manual contains information concerning important procedures and features of Fortress 
Power  lithium  batteries.  Read  all  the  instructions  in  this  manual  before  installation,  operation, 
transportation, storage, and maintenance. 

 

 

 

 

 

 

 

 

 

 

Summary of Contents for EFLEX

Page 1: ...s are manufactured at the highest quality standards It comes with large power capacity and a fast charging and continuous discharge power LFP Chemistry also has nearly twice the cycle life of other Li...

Page 2: ...Lithium Batteries and will void warranty Do not combine Fortress Power Battery with other brands or chemistries Do not mix different capacity batteries do not mix batteries from different installation...

Page 3: ...sizing 10 3 PRODUCT INTRODUCTION 11 3 1 Unboxing Check list 11 3 2 Accessories and Part Numbers 12 4 INSTALLATION 12 4 1 Tools Materials 12 4 2 Inspection before Installation 13 4 3 Installation Cons...

Page 4: ...877 497 6937 sales fortresspower com www fortresspower com 4 5 1 Charging 20 5 1 1 Use the following steps to charge the battery with an external charger 20 5 2 Discharging 20 5 3 Parameter set up gu...

Page 5: ...F 20 C 55 C Charge Temperature 32 F 114 F 0 C 45 C Storage Temperature 20 F 95 F 6 C 35 C Electrical Specifications Nominal Voltage 51 2V Nominal Capacity 105AH Rated Capacity 0 5C 50A 5 374 kWh Resis...

Page 6: ...Rev 1 8 505 Keystone Rd Southampton PA 18966 USA 877 497 6937 sales fortresspower com www fortresspower com 6 Features...

Page 7: ...rrent is present in the device The electronics inside the battery pack are vulnerable to electrostatic discharge All types of breakdown of the product may lead to a leakage of electrolyte or flammable...

Page 8: ...parking during the installation and initial wiring and connection process Wearing insulated gloves clothing and footwear and using electrically insulated tools are required when working with Fortress...

Page 9: ...ations The battery pack comprises multiple batteries that are designed to prevent hazards resulting from failures However Fortress Power cannot guarantee their absolute safety Leaking Batteries If the...

Page 10: ...tery has undergone long term transportation or storage and has not been operated in accordance with the supplementary power requirements The battery is in a disabled or standby state for a long period...

Page 11: ...er during closed loop communication on compatible inverter systems Alternately this can be used along with a RS485 cable as a CAN bus terminator if the Can Bus terminator cap are lost RS485 cable RJ45...

Page 12: ...Due to the variety of systems and components in the field all possible scenarios are not covered This is not the purpose of this section of the manual Refer to professional installers regarding your...

Page 13: ...oltage is 50V charge the battery using an approved battery charger If the Voltage is 55V contact Fortress Power IMPORTANT NOTE Please inform us of any problems within 7 days of receipt of goods Otherw...

Page 14: ...erating to protect itself Frequent exposure to harsh temperatures may deteriorate the performance and life of the battery pack as well as the product warranty 4 4 Installation Steps 4 4 1 Mounting the...

Page 15: ...eFlex 5 4 can be floor mounted in several orientations The orientation depicted to the right with the terminals towards the ground is the only orientation NOT allowed All other orientations are allow...

Page 16: ...minals are not connected to any metal mounting fixture or body part Ensure the terminals are tightened to the recommended terminal torque of 7 0 7 7 Nm 5 1 5 7 ft lb The Fortress Lithium Batteries are...

Page 17: ...nnected as well 3 Connect the eFlex DC positive and negative terminals to the inverter 4 Put the inverter breaker into ON position Note always turn the eFlex battery on first prior to turning on the i...

Page 18: ...d eFlex units a Open Loop Communication If open loop communication is to be used plug a second can bus terminator into the first RJ485 port on the daisy chained eFlex units b Closed Loop Communication...

Page 19: ...always be installed with a charge controller and the appropriate settings to protect the batteries from open PV and other high voltage sources Fortress Lithium Batteries alone will not protect from ex...

Page 20: ...Recommended charging current is 55A Max 100A Please follow the specification on Fortress Lithium Battery Datasheet 5 2 Discharging Do not discharge battery below operating voltage Do not discharge ba...

Page 21: ...fic integration manuals visit www fortresspower com Resources Recommended operating parameters of charger Inverters For 3 000 Cycles Operating temperature range 32 F to 120 F 0 C to 49 C Bulk voltage...

Page 22: ...s a communication error between batteries If the problem persists please contact Fortress Power tech support In normal operation the RUN LED light will be on The number of charging lights LED1 4 that...

Page 23: ...66 USA 877 497 6937 sales fortresspower com www fortresspower com 23 PLEASE CONTACT US FOR TECHNICAL SUPPORT Fortress Power LLC 505 Keystone Road Southampton Pennsylvania 18966 877 497 6937 techsuppor...

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