Exide Technologies Section 92.30 User Manual

Page 12

For temperatures other than 77°F (25°C), the following formula can be used to determine the recom-

mended float charge voltage per cell:

V corrected = V25°C - [(T actual - 25°C) x (.0055 V/°C)] or

V corrected = V77°F - [(T actual - 77°F) x (.003 V/°F)]

Minimum float voltage (temperature corrected) is 2.21 VPC. Temperature correction does not apply

below this value.

Maximum float voltage (temperature corrected) is 2.40 VPC. Temperature correction does not apply

above this value.

Example

At 18.3°C (65°F)

V corrected = 2.27 - (18.3-25) (.0055)

= 2.27 + .037

= 2.307 VPC

Modern constant voltage output charging equipment is recommended for the float charge method of

operation for the batteries. This type of charger, properly adjusted to the recommended float voltages

and following recommended surveillance procedures, will assist in obtaining consistent serviceability

and optimum life.

After the battery has been given its initial charge (refer to Section 8), the charger should be adjusted

to provide the recommended float voltages at the BATTERY TERMINALS.

Do not use float voltages higher or lower than those recommended. Reduced capacity or loss of bat-

tery life will result.

9.2 VOLTMETER CALIBRATION

Panel and portable voltmeters used to indicate battery float voltages should be accurate at the oper-

ating voltage value. The same holds true for portable meters used to measure individual cell/battery

voltages. These meters should be checked against a standard every six months and calibrated when

necessary.