B-13
Appendix B - Battery Information
©2002 Xantrex Technology Inc. All Rights Reserved.
P/N 975-0049-01-01 Rev A 10/2002
Battery Care and Maintenance (continued)
Check Battery’s State-of-Charge
The battery’s state-of-charge should be checked
monthly and only when the battery is not powering
heavy loads or being actively charged. If the batteries are
readily accessible, measure the voltage across the
individual battery terminals. There should be less than a
0.2 volt difference between each battery.
To determine the individual cell voltage, divide the
voltage by the number of cells in the battery
(i.e., 12.6 volts divided by 6 cells = 2.1 volts per cell). If a
greater difference is measured, the batteries may need
to be equalized (liquid lead-acid types only) or replaced.
All batteries in the bank should measure the same
voltage. The voltage should match the following table for
the entire battery bank output. These values indicate
the overall battery’s state-of-charge for the entire bank.
Individual cell voltages (if available) are also shown as a
percentage of charge.
The values given are for a temperature of 77 °F (25 °C).
Cooler temperatures produce lower voltage
measurements.
