Eflex Install Manual

Rev. 1.92
505 Keystone Rd, Southampton, PA 18966, USA . [phone]. [e-mail] .
www.fortresspower.com
17
4.4.3 Other installation methods
The eFlex is designed for multiple installation methods. The T-slot at the back of the enclosure
provides the flexibility to use standard size 8 - M6 or M8 hammer screw to secure the battery to a
variety of racks, including 19” server racks. In all cases, a clearance of 1” around the eFlex battery is
required. Please visit https://www.fortresspower.com/fortress-power-video-library-2/ for videos on
installing the eFlex.
4.4.4 Connecting the battery to the Charge Controller and/or Hybrid Inverter
1. Ensure the battery is turned off by verifying the LED lights are is off and there is no voltage
across the terminals.
2. Install the positive cable first and the negative cable second. Do not cross the positive and
negative terminals; also, ensure the terminals 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 equipped with two M8 threaded terminals with a lock
washer and nut. 8mm ring terminals or 3/8ths inch ring terminals, along with proper size
wiring cables, are required to connect the battery to the inverter/charger. Do not reverse
polarity-- doing so will void warranty. Use a voltmeter to check polarity before
connecting terminals.
4.4.5 Using RS485 and CAN Communication
Fortress eFlex 5.4 has a self-managed Battery Management System (BMS). No
communication is required between a battery-based inverter and the eFlex 5.4 to operate the
system. The unit has two ports on the front face of the battery. Both ports are designed to
support RS 485 and CAN communication. These ports are used in multi-battery in parallel
setup (see section 4.4.7.) or in some cases to communicate with a compatible hybrid
inverter/charge controller. Below is a sketch of the communication between paralleled
batteries.