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OutBack Power Systems Inc.
SUGGESTED BATTERY CHARGER SET POINTS
The battery manufacturer should provide you with speci c instructions on the following mainte-
nance and voltage set point limits for the speci c batteries. The following information can be used
when the manufacturer’s information is not available.
SEALED LEAD ACID – AGM / GEL 12 V 24 V 48 V
ABSORB voltage set point 14.4 V 28.8 V 57.6 V
FLOAT voltage set point 13.4 V 26.8 V 53.6 V
NON-SEALED LEAD ACID 12v 24v 48v
ABSORB voltage set point 14.8 V 29.6 V 59.2 V
FLOAT voltage set point 13.8 V 27.6 V 55.2V
Note: Higher settings can be used with non-sealed batteries, but water consumption will be
greater and excessive temperatures when recharging may occur.
Battery Voltage and State of Charge
A battery’s voltage can be used as a guideline to estimate the amount of power stored in the
battery that is available for use. When referencing the battery voltage on the display, be sure the
battery is not under signi cant recharging or heavy loads. Otherwise, the DC voltage is not re ec-
tive of the battery state of cycle. Often the best time to check the battery voltage is in the morning
(pre-charging) or at night (postcharging), with the battery disconnected from charging sources
and loads and a rest for at least three hours.
Operation of a battery below 50% state of cycle will adversely a ect the long term health of the
battery system and will result in premature failure. Keeping the battery above the 50% level and
recharging it completely once a month will ensure proper operation and good performance.
STATE OF CHARGE
Nominal Battery Charged Good (~75%) Average (~50%) Low (~25%) Discharged
Voltage
12v over 12.6v 12.3v 12.0v 11.7v under 11.4v
24v over 25.2v 24.6v 24.0v 23.4v under 22.8v
48v over 50.4v 49.2v 48.0v 46.8v under 45.6v
60v over 63.0v 61.5v 60.0v 58.5v under 57.0v