Open Circuit Voltage Testing - US BATTERY US1800 XC2 User Manual

8
TROUBLESHOOTING
● If the end-of-charge voltage does not exceed the values above, check the charger
to ensure the proper output is being maintained. Recharge the batteries and mea-
sure again. If the pack voltage is still low, you may have a bad battery.
● While the pack is on charge, measure the individual battery voltages and compare
to the table below. If the minimum voltage is not attained and/or the variance be-
tween the batteries is greater than the allowable variation, the low battery may be
failing.
TABLE 7
On-charge Test Threshold
Nominal Battery Minimum Voltage
Voltage Threshold
6V
8V
12V

8.5 OPEN CIRCUIT VOLTAGE TESTING

This is the least preferred method of evaluating the condition of your battery due to the
misleading nature of open circuit voltages.
● For accurate voltage readings, flooded lead acid batteries should remain idle
for at least 4-6 hours. AGMs should remain idle for at least 24 hours.
● Measure the individual battery voltages.
● If any recorded voltage differs from another battery within the set by more than
0.3V, you may have a failing battery.
QUICK TIP
SINGLE POINT WATERING KITS:
GREAT WAY TO REDUCE THE AMOUNT OF TIME IT
TAKES TO MAINTAIN YOUR FLOODED BATTERIES. ALL
BATTERIES CAN BE WATERED FROM ONE SOURCE.
THE VALVES ENSURE THAT ELECTROLYTE LEVELS ARE
PROPERLY MAINTAINED. FOR MORE INFORMATION
VISIT WWW.USBATTERY.COM
38
Allowable Variation within a
Set
7V 0.5V
9.3V 0.7V
14V 1.0V
ARE A
TABLE 8
Flooded Lead Acid Battery State of charge vs Specific Gravity
and Open Circuit Voltage
Specific
State of Gravity
Depth of Charge Corrected
Discharge (%) to 80ºF 6V
0% 100 1.270 6.37
10% 90 1.246 6.31
20% 80 1.221 6.25
30% 70 1.197 6.19
40% 60 1.172 6.12
50% 50 1.148 6.05
60% 40 1.123 5.98
70% 30 1.099 5.91
80% 20 1.074 5.83
90% 10 1.050 5.75
100% 0 1.025 5.68
#Cells 3
TABLE 9
AGM Battery State of Charge vs Open Circuit Voltage
State
AGM Battery Open-Circuit Voltage
of
Depth of Charge
Discharge (%) 6V 8V
0% 100 6.50 8.67
10% 90 6.44 8.58
20% 80 6.37 8.50
30% 70 6.31 8.41
40% 60 6.25 8.33
50% 50 6.19 8.25
60% 40 6.12 8.16
70% 30 6.06 8.08
80% 20 6.00 7.99
90% 10 5.93 7.91
100% 0 5.87 7.83
#Cells 3 4
Open-Circuit Voltage
8V 12V 24V 36V 48V 108V
8.49 12.73 25.46 38.20 50.93 114.7
8.41 12.62 25.24 37.85 50.47 113.6
8.33 12.50 25.00 37.49 49.99 112.5
8.25 12.37 24.74 37.12 49.49 111.4
8.16 12.24 24.48 36.72 48.96 110.2
8.07 12.10 24.20 36.31 48.41 108.9
7.97 11.96 23.92 35.87 47.83 107.6
7.88 11.81 23.63 35.44 47.26 106.4
7.77 11.66 23.32 34.97 46.63 104.9
7.67 11.51 23.02 34.52 46.03 103.5
7.57 11.35 22.70 34.05 45.4 102.2
4 6 12 18 24
12V 24V 32V 48V 108V
13.00 26.00 39.00 52.00 117.0
12.87 25.75 38.62 51.50 115.9
12.75 25.50 38.24 50.99 114.7
12.62 25.24 37.87 50.49 113.6
12.50 24.99 37.49 49.98 112.5
12.37 24.74 37.11 49.48 111.3
12.24 24.49 36.73 48.98 110.2
12.12 24.24 36.35 48.47 109.1
11.99 23.98 35.98 47.97 107.9
11.87 23.73 35.60 47.46 106.8
11.74 23.48 35.22 46.96 105.7
6 12 18 24 54
User Manual
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