OnLine Power PBC I - Manual (Page 41)

Appendix C: Battery Maintenance Testing & Specifications
Battery Specifications:
• Battery Impedance - The battery impedance value is measured @ 25 o C
. This value is for new
batteries at full state of charge, on open circuit at a frequency of 30 Hz. Battery type PRC-1250XL
impedance is 5.05 milliohms.
• Float Voltage - The specified float voltage “ window ” is 2.27 - 2.30 V.P.C. @ 25 0 C. This value
will help in reducing recharge times and keeping the batteries at the highest state of charge.
Recommended Procedures:
These methods are designed to be used on a battery system installed for a minimum period of 6
month, in a steady state of float condition and not under conditions of high current recharge or
discharge.
Measure Float Voltage:
• When the low battery LED is “ ON ” over 24 hours test system, remove the battery tray plug
from the battery jack on the electronic tray, so readings can be taken.
• Measure and record system voltage directly across the battery plug.
• If the battery system is determined to be low voltage system after 24 hours of charging the
system voltage will be only 3% low, remove and replace the battery tray.
Battery Servicing:
• Measure and record a 10% sample of individual battery temperatures at the negative terminal
post.
• Identify batteries that are greater than 3
o
C above ambient from the calculated average. If no
external causes for higher battery temperatures are noted.
• Check that the filters are clean and Fans are operational.
• If no change is noted, remove and replace the battery tray.
Visual Inspections:
• Examine batteries for any abnormalities in end wall bulge, post leakage, cover to cells
leakage, etc.
• Identify any end wall bulges that exceed 1/2 inch compared to the other batteries in tray.
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