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© 2012 Magnum Energy, Inc.
3.0 Setup
Set Absorb Done (Amps)
–
This setting is used when the DC amperage
supplied to the batteries (i.e., return amps) is used to determine when the
batteries are fully charged. During Absorb Charge mode, the return amps
from the charger slowly decrease. When this current decreases below the
Absorb Done Amps
setting, the charger transfers from the Absorb charge
cycle to the
fi
nal charge stage (see
03G Final Charge Stage
).
Most battery manufacturers use a speci
fi
c formula to determine the return
amps that indicate a full charge for their particular type of battery. The
formula used by most manufacturers to absorb the batteries is C/20,
where C=Battery Bank’s Total Amp Hours. Basically, they take approxi-
mately 5% of the total battery bank size, and consider the battery totally
charged when the charger’s return amps drops to this level. Continuing
to charge past this level may possibly overcharge the batteries. Check
with your battery manufacturer to
fi
nd out what the correct return amp
settings are for your batteries.
Default setting:
Absorb Done Amps = 20 ADC
Range:
0-150 ADC
Info:
Setting the
Absorb Done Amps
value to 0 (zero) will keep the
charger in the Absorb charge mode until the
03F Max Charge Time
setting is reached (if no BMK installed).
Info:
If DC loads are connected directly to the batteries, it is not
recommended that you use the
Absorb Done Amps
setting. DC loads
cause the charger to increase amperage delivered to the battery
bank in order to charge the batteries, plus run the DC loads. This
scenario could result in overcharging the batteries since the return
amps reading will be skewed by the DC loads.
Info:
It is highly suggested that you install a battery monitor
if the
Absorb Done Amps
setting is used. If a battery moni-
tor is not installed, the
Absorb Done Amps
setting relies on the
METER menu’s
01B DC Amps
value to determine when to transfer out
of the Absorb Charge mode. When a battery monitor kit (ME-BMK/
ME-BMK-NS) is installed, the
Absorb Done Amps
setting relies on
the METER menu’s
04C DC Amps–BMK
value to determine when to
transfer out of the Absorb Charge mode. This is the most accurate
DC amperage measurement. The DC amps reading from the battery
monitor is accurate to +/- .1 ADC.
Table 3-3, Battery Amp/Hrs Capacity to Suggested Absorb Time
Battery
AmpHrs
Capacity
Absorb Time
Battery
AmpHrs
Capacity
Absorb Time
200 to 300
1.0 Hrs
1310 to 1500
4.0 Hrs
310 to 500
1.5 Hrs
1510 to 1700
4.5 Hrs
510 to 700
2.0 Hrs
1710 to 1900
5.0 Hrs
710 to 900
2.5 Hrs
1910 to 2100
5.5 Hrs
910 to 1100
3.0 Hrs
2110 to 2300
6.0 Hrs
1110 to 1300
3.5 Hrs
2310 to 2500
6.5 Hrs
