kWh Lithium Ferro Phosphate (LFP) Installation
Rev. 1.8
505 Keystone Rd, Southampton, PA 18966, USA . (877) 497 6937. sales@fortresspower.com .
www.fortresspower.com
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➢ Positive and negative battery cables. It is recommended to install a 150A fuse
between the bus bar and the battery. We recommend copper cables larger than AWG
2/0. The battery cables are not included. Please refer to the published Battery Cable
Sizing Chart for the proper size, based on your system specification.
➢ Positive and Negative Terminal lug recommendation: M8 (diameter: 8mm or 5/16in)
➢ Screwdriver
➢ Communication Bus Terminator: to Match Impedances during parallel setup
➢ RS 485 cable
➢ RECOMMENDED: Small 48V Charger for trickle-charge purposes
➢ OSHA approved personal protective equipment
4.2 Inspection before Installation
✓ Check the battery package, type, quantity, appearance and other components
✓ Check if there is any damage on the battery box
✓ Check the battery terminals and connections to make sure they are clean, free of dirt,
fluids and corrosion
✓ Check the Open Circuit Voltage.
o Set the battery on a clean working space.
o Make sure the + and - terminals are not contacting anything.
o Locate the eFlex Power Button and press it momentarily. Wait for ~10 seconds for
the LED self - diagonstic to complete.
o Confirm that the LED lights are green (there should be statement here on what the
operator should see once the eFlex is turned on and operating normally.
o Using a Voltage Meter check that the voltage across the terminals is between 50V-55V.
▪ If Voltage 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.
Otherwise, we deem that clients have no objection to the goods.
Insulated gloves
Safety Glasses
Safety Shoes










