Freedom LiTE Installation Manual Revision 14
P a g e
25 | 30
•
Temperature of the environment
–
ensure that the environment in which the
battery is operating (battery room) is maintained as closely as possible to 20°C.
Avoid allowing the ambient temperature to fall below (zero) 0°C or rise above 30
°
C.
Operation (and storage) of the battery above 30°C will substantially reduce its
service life.
•
Temperature inside the battery
–
The battery is equipped with multiple
temperature sensors and the temperature is transmitted to most inverters or system
controllers on CAN Bus. This data is usually stored on the inverter monitoring portal.
This allows the user to on occasion review the history of the battery internal
temperature. It is acceptable to see the internal temperature rise to as much as 50°C
when the battery is working very hard for a brief time, however the internal
temperature should not regularly exceed 25°C. If the battery spends too much time
above 25°C, reduce the battery room temperature, and/or reduce the charge current
limit so that the battery is given more time to charge. These measures will both help
to reduce the time the battery internal temperature spends above 25°C, which will
extend the life of the battery.
•
Check that the battery SoC does not regularly fall below 20%. On grid connected
systems this is ensured by setting the minimum SoC with grid to 20%. For off grid
systems, if the battery regularly falls below 20% it is a sign that the loads need to be
reduced or more storage capacity is required.
•
Check that the battery reaches BOTH 100% SoC and at least 55.5V on a regular basis
(at least every 5 days). This is to ensure that the SoC value given by the BMS remains
in calibration.
•
Review the recent historical lowest cell voltage and highest cell voltage values on the
monitoring platform to ensure that the variance is not too high
–
when the battery is
fully charged at 55.8V, there should not be any cells lower than 3.38V or higher than
3.85V. If this does occur, set the battery to remain fully charged (for grid connected
systems) and then revert to cycling it again once the cells are within range.
11.2
Maintenance
LiTE’s in regular use require no
routine maintenance. A LiTE in occasional use, such as for
backup where use is very infrequent, must receive a maintenance discharge and charge
cycle at least once every six months. Likewise, a LiTE that is not in use (in long term storage)
must be connected to an inverter/charger and put through one discharge and charge cycle
at least every six months. The discharge should be made down to 20% SoC and the charge
should then be back to 100% SoC before being placed back into storage. The current for this
cycle in discharge and charge should be about 0.1C. So 10A for a 100Ah battery for example.
For additional safety the user should ask an electrician to inspect all cable connections in the
overall system to ensure that there are no loose or “hot” connections that could lead to
system damage or fire.
The firmware on the LiTE should be updated if it’s manufacture was 201
9 or earlier.
