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NOTE: Recommended refreshing charge values are
applicable to cell temperatures between 15 degrees
to 32 degrees C 60 degrees to 90 degrees F. For
cell temperatures 4 to 15 degrees C 40 degrees to 59
degrees F use twice the number of hours. For cell
temperatures 4 degrees C 39 degrees F and below, use
four times the number of hours.
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Contracting Officer shall coordinate the battery refreshing charge process
with Contractor and UPS technical representative. The only acceptable
method of giving a refreshing charge is constant voltage. UPS technical
representative will instruct Contractor on adjusting the rectifier voltage
as required by this process. Battery refreshing charge is Contractor's
responsibility. Contractor shall provide the manpower, including an
authorized representative of the battery manufacturer, and all necessary
equipment to monitor the refreshing charge process.
a.
The refreshing charge shall be determined by the maximum voltage
that the connected equipment can tolerate, and of that which the
charger can deliver.
Divide the voltage by the number of cells in the battery, and charge at
that voltage; provided it does not exceed 2.40 volts per cell 25 degrees C
77 degrees F. After the charge current has tapered and stabilized for 24
hours, continue the charge for the number hours as follows:
Refreshing Charge
CELL VOLTS
MIN. HOURS TO CHARGE
2.22
[_____]
2.27
[_____]
2.30
[_____]
2.35
[_____]
2.40
[_____]
DO NOT EXCEED 2.40 VOLTS PER CELL 25 DEGREES C 77 DEGREES F.
]3.3.6
Float Charge
a.
The UPS technical representative will adjust UPS for float
operation.
b.
Allow battery to float for a minimum of 72 hours to permit cell
voltages to stabilize.
c.
Measure and record voltage, specific gravity and temperature of
each cell.
d.
Should the float voltage of any cell read below 2.08 volts DC or
the specific gravity read less than 1.190 corrected to 25 degrees C
77 degrees F, remove cell from battery and connect the two
adjacent cells with a short length of cable to maintain series
connection of remaining cells. Discharge performance test may be
conducted with one or more cells missing; however, discharge time
will be reduced accordingly. NOTE: The rectifier output voltage
to battery on float shall be reduced by 2.25 volts for each cell
SECTION 16262N
Page 17
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