C&D Technologies RS-2044 msEndurII Series - Manual (Page 21)

RS02044/1114/CD 21 www.cdtechno.com
7.1 Initial Charge
All cells are shipped fully charged from the factory with no need for an initial freshening or equalization
charge. The cells should be constant voltage charged at the average float voltages as noted in Table 1
below. However, when in storage or transit for an extended period (especially at temperatures above
77°F/25°C) or when the number of cells is greater than 24 cells; it is recommended the battery system
be given an initial freshening charge (see Table 1) at installation.
Table 1 – Initial Charge at 77°F (25°C)
C e l l
Type
Average String
Float Voltage
77°F (25°C)
Average String
Freshening
Voltage
Freshening /
Equalization
Charging
Time
VPC VPC Hours
ATP 2.25 to 2.30 2.40 +/- 0.02 12 – 16
ATLP 2.17 to 2.22 2.34 +/- 0.02 12 – 16
Notes:
a. Battery float voltage should be set at Table 1 average cell voltage multiplied by the number of cells in the battery string.
Individual cell float voltages may vary by +0.10/-0.05 volts from the average in a single string.
b. Initial battery charge current on the constant voltage recharge should not exceed 25 amps per 100 amp-hour battery rating.
c. Average string float voltage must be adjusted based on temperatures which are above or below 77°F (25°C) - see section 8.3.
d. Charging time will vary due to temperature if cell temperature is below 60°F (16°C), double the charge time for initial or equalize charge.
e. For high voltage strings, see Section 7.1.1.
f. If a battery load test will be performed within 90 days of installation, an initial freshening charge followed by a 72 hour float charge (per
IEEE 1188) is required to ensure full capacity.
7.1.1 Initial Charge – UPS Applications
UPS battery strings typically contain many more cells connected in a series string versus
Telecommunications lower voltage applications. A UPS application may consist of 240 cells (480 VDC)
in a series as compared with 12 to 24 cells (24 to 48 VDC) for the typical Telecom application. It is
recommended in High Voltage UPS applications, the ATP and ATLP series of msEndur II batteries be
given a freshening charge at installation (see Table 1). This initial charge will assure higher initial
performance and reduce the time period required for the battery to achieve proper voltage balance
between the individual units.
7.2 Initial Charge Records
At the completion of the initial charge and after the cells have been on float charge for approximately one
week, record voltages of the individual cells, the total battery voltage and ambient temperature. Retain
this information in your files for future reference. This information establishes a baseline for future
reference. The information below must be recorded or refer to RS-1992 found in Appendix E. Make a
photocopy of the form and use it whenever necessary to record readings taken on the battery.