Stationary VRLA Batteries,
Installation and Operation Instructions
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8.4
TEMPERATURE-RELATED CHARGING VOLTAGE
A temperature-related adjustment of the charging voltage within monthly averaged
battery temperatures of 10°C (50°F) to 45°C (113°F) is not necessary.
For temperatures below 10°C (50°F) in the monthly average the charging voltage should
be increased by 0.005 volts per 1°C (1.8°F) for a faster recharging.
For temperatures above 45°C (113°F) in the monthly average the charging voltage
should be decreased by 0.004 volts per 1°C (1.8°F) to reduce water decomposition and
corrosion.
Most standard chargers sold today have temperature compensation capabilities to
manage the charge voltage. See individual charger specs for capability and verify that it
is active.
8.5 OPERATING TEMPERATURE
All nominal data for BAE stationary batteries is stated based on an operating
temperature of 25°C (77°F), the recommended operating temperature range for the BAE
cells is 10°C (50°F) to 30°C (86°F). To maximize life and performance the ideal
operating temperature range is 20°C (68°F) to 25°C (77°F).
Lower constant temperatures reduce available capacity.
Higher constant temperatures will reduce the anticipated life expectancy of the battery
due to the increase in the corrosion rate of the cell plates. For example, an increase in
temperature of 8.4°C (15°F) over the 25°C (77°F) norm would double the corrosion rate,
thus this reduces battery life to 50% of the normal life expectancy. A further increase of
16.7°C (30°F) over the 25°C (77°F) norm would further reduce the service life to 25% of
the normal life expectancy.
NOTE: Exceeding the temperature limit of 45°C (113°F) up to 55°C (131°F) is only
acceptable for short periods. At no time should the cell temperature ever exceed
55°C (131°F) as permanent battery cell damage will result.
8.6 DISCHARGE CYCLE
A battery is discharged either when the discharge duty cycle is performed when the AC
voltage supply fails or when battery capacity tests are conducted on the system. When
setting up routine maintenance procedures that include in-service capacity tests, it
should be noted that frequent boost charge/discharge cycles could reduce the service
life of the battery.
NOTE: It is important not to over discharge a storage battery. Reference the data
sheet or battery discharge table for the specific values. These values must not
be exceeded.
8.7 RECHARGING CYCLE
Fully discharged and/or partially discharged batteries must not be allowed to remain in a
discharged state for longer than 24 hrs
,
as damage may occur. Therefore, it is
necessary to begin recharging immediately after a battery has been discharged. If
sufficient time is available to re-charge, use the charger float mode set at 2.25 VPC.
If a complete recharge is to be accomplished within a shortened time period
,
it will be
necessary to charge at a higher voltage. (See Section 8.2 Equalization Charging)
