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Battery Maintenance
976-0043-01-02
C–17
State of Charge
The battery’s state-of-charge should be checked often and only when the
battery at a state of rest (when the battery is not powering loads or
actively being charged). First thing in the morning is usually the best time
to check the state of charge. 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 (25.2 volts divided by 12 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 (this is not an
accurate measurement for cross-tied batteries’ as each battery is in
parallel with another battery making individual battery measurements
impossible).
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.
Table C-6
Battery State-of-Charge
System Voltage
Percent of Full
Charge
12 Volt
24 Volt
48 Volt
Individual
Cell
Voltage
100%
12.7
25.4
50.8
2.12
90%
12.6
25.2
50.4
2.10
80%
12.5
25.0
50.0
2.08
70%
12.3
24.6
49.2
2.05
60%
12.2
24.4
48.8
2.03
50%
12.1
24.2
48.4
2.02
40%
12.0
24.0
48.0
2.00
30%
11.8
23.6
47.2
1.97
20%
11.7
23.4
46.8
1.95
10%
11.6
23.2
46.4
1.93
0%
< 11.6
< 23.2
< 46.4
< 1.93
Summary of Contents for SW Plus 2524
Page 2: ......
Page 3: ...Sine Wave Plus Inverter Charger Owner s Manual...
Page 82: ...2 48...
Page 105: ...DC Wiring 976 0043 01 02 3 23 Figure 3 13 DC Connections to a Single Inverter...
Page 107: ...DC Wiring 976 0043 01 02 3 25 Figure 3 14 DC Connections to Dual Inverters...
Page 126: ...3 44...
Page 132: ...4 6...
Page 141: ...Menu Map 976 0043 01 02 5 9 Figure 5 10 User Menu Map Part 2...
Page 143: ...Menu Map 976 0043 01 02 5 11 Figure 5 12 Basic Setup Menu Map Part 2...
Page 145: ...Menu Map 976 0043 01 02 5 13 Figure 5 14 Advanced Setup Menu Map Part 2...
Page 146: ...Navigation 5 14 976 0043 01 02 Figure 5 15 Complete User Menu Map...
Page 147: ...Menu Map 976 0043 01 02 5 15 Figure 5 16 Complete Basic Setup Menu Map...
Page 148: ...Navigation 5 16 976 0043 01 02 Figure 5 17 Complete Advanced Setup Menu Map...
Page 250: ...8 32...
Page 274: ...A 16...
Page 308: ...C 18...
Page 312: ...D 4...
Page 316: ...E 4...
Page 338: ...I 6...
Page 342: ...Index IX 4 976 0043 01 02...
Page 343: ......