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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CAUTION! When paralleling the eFlex 5.4 batteries without connecting them via RJ45
cable(s), please make sure the difference between the highest voltage and lowest
voltage does not exceed 0.5 volts. A large current flow from the higher voltage battery to the
lower voltage battery could potentially damage one or both batteries. Resulting damage to the
battery will void the warranty.
4.5
KEY POINTS SUMMARY:
1. Each Fortress Lithium Battery contains circuitry that protects the Lithium Ferro Phosphate cells from
overcharging, over-discharging, and excessive load amperage. If the values specified are exceeded,
the battery will enter a protective shut down state. In some cases, this may result in the need to re-
initialize an inverter charger or other pieces of equipment in the installation. In other cases, the inverter’s
system settings may be saved within the inverter memory storage and will not need to be reset. This is
not an absolute standard but is common among most inverter chargers. Check your inverter
manufacturer specifications.
2. Although each Fortress Lithium Battery contains circuitry that protects the Lithium Ferro Phosphate
cells from overcharging, over-discharging and excessive load amperage, Fortress Lithium Batteries
must 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
extreme electrical phenomena.
4. GRID TIED SYSTEMS: Once the Fortress Lithium Battery has been installed, turn on the entire
system to test. Once testing has been completed, please disconnect the batteries from the load center
until your local Utility Inspector is ready to turn on the entire system. The charge controllers and inverter
monitoring systems can drain the Fortress Lithium Batteries over an extended period when the entire
system is not fully operational due to the electrical draw of the system components.
5. OFF GRID SYSTEMS: Do not connect the Fortress Lithium Batteries until the entire system is ready
to turn on and is fully operational.
6. See Inverter and Charge Controller Settings on the Fortress Power website for recommended
settings at
https://www.fortresspower.com/resources/
4.6 System Commissioning
Final installation and operation guidelines will be dictated by your Electrician and Installer based
on the specifics of your installation and any code requirements that apply to your region. Fortress
Power technicians and sales staff are available to provide any additional information on the Fortress
Lithium Batteries as needed. Please be aware of the potential electrical hazards before interacting
with any and all electrical or mechanical devices. Please take all necessary safety precautions in
your projects and installations.
