User Guide

25
USER’S GUIDE
25
Table 9
ON-CHARGE TEST THRESHOLDS
NOMINAL BATTERY VOLTAGE
MINIMUM VOLTAGE
THRESHOLD
ALLOWABLE VARIATION
WITHIN A SET
6V 7V 0.5V
8V 9.3V 0.7V
12V 14V 1.0V
9.3. Specific Gravity (flooded/wet batteries only)
î Use a reliable, high-quality hydrometer for specic gravity measurements.
î Fill and drain the hydrometer 2 - 3 times before drawing a sample from the battery.
î Measure specic gravity readings for all battery cells.
o Correct specic gravity readings for temperature by adding 0.004 for every 10°F (5°C) above 80°F
(27°C), and subtract 0.004 for every 10°F (5°C) below 80°F (27°C).
o If every cell in the battery set is below 1.235, the
batteries may be undercharged and require recharging.
o If any battery has a specic gravity variation of more
than 0.030 between cells, equalize the set.
o If there is still a signicant variation, there may be a
failed battery.
9.4.Open Circuit Voltage Testing
î For accurate voltage readings, batteries must remain idle at least 6 hours, and preferably
up to 24 hours.
î Measure and record the individual battery voltages.
î If any recorded voltage diers from another one by more than 0.3V, equalize the set
(deep-cycle ooded/wet batteries ONLY). Refer to Section 5.3, Equalizing.
î Measure the individual battery voltages again.
î If any recorded voltage diers from another one by more than 0.3V, compared to any
other battery in the set, you may have a failed battery.
Hydrometer