Alpha Technologies Cordex Controller Ver.3.1x - Manual (Page 56)

0700015-J0 Rev B 54
Temp Comp Slope Desired temperature compensation slope
Number of Cells Number of battery cells per string
Figure 56 — Battery Properties and Peukert Calculator windows
Open Circuit Voltage Sets the open circuit voltage (derived from battery manufacturer’s
specifications).
Peukert Number The Peukert number relates to the internal resistance of a battery and provides
an indication (inversely) of the expected capacity; that is, a lower number is
better.
This number can be entered in two ways. If the battery manufacturer has
supplied a Peukert number, then it can be entered as a simple, one step
numeric entry.
If a Peukert number is not available, it must be calculated. This multi-step
process involves entering four numbers derived from battery manufacturer’s
specifications. Resulting Peukert number should be above 1.000 and below
2.000.
Peukert Calculator To calculate the Peukert number the Supervisor must enter unique values for
Peukert Time 1 and Peukert Time 2 and the corresponding discharge current
for each. This information is taken from the battery specification sheet. Typically,
time values of two hours and twenty hours provide the necessary data for the
Peukert number calculation.
6.5.7 Battery Properties
The Battery Properties window contains information provided by the
battery manufacturer. This data is used by the Charge Current Con-
trol, Battery Monitor, and Temperature Compensation features.
Capacity Rating (20-
Hour Rate) Specified total capacity of the battery
string (derived from battery manufacturer’s
specifications and should correspond to
the C/20 Capacity if possible). This value is
used in the calculations for charge current
control function and capacity estimation.
NOTE: If multiple strings are used, this
value represents the total combined
capacity of all battery strings summed
together.
Capacity Calibration A value that effectively “calibrates” the
Battery Capacity. This is necessary when
the batteries are first commissioned and
whenever an independent test is done to
measure the battery’s capacity.
Figure 57 — Battery Properties - Web