Rev. 1.8
505 Keystone Rd, Southampton, PA 18966, USA
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(877) 497 6937
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www.fortresspower.com
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4.4.3 Floor standing installation
The eFlex 5.4 can be floor-mounted in several orientations to best suit your application. When
determining the battery orientation for floor-mounting, it is important to note that the orientation
depicted to the right, with the terminals closest to the floor is NOT recommended.
When mounting the eFlex to the floor, use the included
mounting brackets to prevent the battery from tipping over.
1. Gently place the eFlex on the floor in the preferred
orientation
2. Attach the mounting bracket using the T-slot fastener
and T-slot groove on the back of the eFlex
3. Screw the mounting bracket into the wall
4. Connect the battery terminals to the corresponding
bus bar and inverter
4.4.4 Connecting the battery to the Charge
Controller and/or Hybrid Inverter
Ensure the battery is turned off by verifying the
LED’s are off and there is no voltage across the terminals. 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 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