©
2014 Magnum Energy, Inc.
Page 31
Setup
• 03D Absorb Done (Time, Amps, SOC)
– This setting identi
fi
es whether time, amps, or SOC
are used to determine when the second stage of battery charging (Absorption) is
fi
nished. The
charge cycle transitions to the
fi
nal charge stage (
03G Final Charge Stage
) afterwards. Ab-
sorption is the second stage of the charge process that attempts to fully charge the batteries.
Note:
If “
CC/CV Controlled
” displays on this menu’s screen, you will not be able to adjust the
settings as “
CC/CV
” has been selected as the battery type from the
03C Battery Type
menu.
Info:
If the Absorption stage is short or terminated, the batteries may not receive
a full charge. In contrast, if the Absorption stage is too long the batteries may be
overcharged. Either scenario may lead to damage to the batteries. Contact your battery
manufacturer to ensure the best charge settings are used for your type of batteries.
◊
Set Absorb Done Time
–
Absorb Done Time
is used when a speci
fi
c time is determined
to be best for ending the Absorption stage. When using time, the battery bank size typically
determines the length of the
Absorb Done Time
setting. The larger the battery bank, the lon-
ger the absorption time needed to ensure a full charge to the batteries. Taking speci
fi
c gravity
readings of the batteries and adjusting the absorption time may be needed in order to obtain
the appropriate absorb time for your battery type and battery bank size. See Table 3-2 to help
select the
Absorb Done Time
setting based on the AHr capacity of your battery bank.
Default setting:
2.0 Hrs
Range:
0.1-25.5 Hrs
Info:
This setting’s range is dependent on the inverter’s compatibility level (Appendix
A). Inverters with a compatibility level of 4.0 or greater, the available range is 0.1-25.5
hours. However, if the inverter compatibility level is less than 4.0—even though you
can adjust the setting from 0.1-25.5 hours—the available range may not be recognized
by the inverter and will cause the charger to revert to the default setting of 2.0 hours.
◊
Set Absorb Done Amps
–
This setting is used when the DC amperage supplied to the
batteries (also known as “return amps”) is used to determine when the batteries are fully
charged. During Absorb charge mode—as the battery charges—the current required by the
battery decreases. When the return amps decreases below the
Absorb Done Amps
setting
for two minutes, the charger transfers from the Absorption 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 approximately 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:
20 ADC
Range:
0-250 ADC
Info:
Setting the
Absorb Done Amps
value to 0 (zero) keeps the charger in the Absorb
charge mode until the
03F Max Charge Time
setting is reached (if no BMK installed).
Info:
When using
Absorb Done Amps
, the charger stays in the Absorption charge mode
for a minimum of two minutes—independent of the actual
Absorb Done Amps
setting.
Info:
If DC loads are connected directly to the batteries and a Magnum battery monitor
is not installed, the
Absorb Done Amps
setting should not be used. To charge the
batteries—plus run the DC loads—the charger must increase the current delivered to
the battery bank. This may 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 monitor is not installed, the
Absorb Done Amps
setting
relies on the
METER: 01B DC Amps
value to determine when to transfer out of the
Absorption charge mode. This is the most accurate DC amperage measurement.
