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©
2014 Magnum Energy, Inc
.
Setup
Figure 3-10, CV Charge Done Time/Amps Stages (INV/CHG)
Constant
Current
Constant
Voltage
Silent
Constant
Current
Voltage
Current
Max Charge
Amps
CV Charge
Volts
Recharge
Volts
(restarts
Constant
Current
charge)
CV Charge Done
(= Time or Amps)
CURRENT & VOLTAGE
TIME
¤ Set
CV Charge Done
–
These selections determine when the second stage of charging
(Constant Voltage) is
fi
nished. If using the
CV Chg Done Time
or
CV Chg Done Amps
selec-
tions, once the Constant Voltage charge cycle is
fi
nished, it transitions to a Silent charge
stage. After entering the Silent charge mode, the charger automatically stops charging,
but is still actively monitoring the battery voltage. The charger will remain “Silent” until the
battery voltage drops to the
Set Recharge Volts
setting, at which time the charger will start
another Constant Current/Constant Voltage charge cycle (see Figure 3-10).
Default:
CV Charge Done Time
Range:
Time, Amps, Hold CV Chg VDC
* Set CV Chg Done Time
– The
CV Chg Done Time
selection is used when a spe-
ci
fi
c time is selected to be the best solution for determining when the batteries are fully
charged and the Constant Voltage stage needs to end. This setting determines how long
the charger will hold the battery voltage at the
CV Charge Volts
setting—based on a set
time period. When using time, the battery bank size will typically determine the length of
the
CV Chg Done Time
setting. The larger the battery bank, the longer the time needed
to ensure a full charge to the batteries. If the setting is from 0.1 to 25.5 hrs, the charger
transitions to the Silent charge mode after the battery voltage has been at the charge
voltage setting for the selected time. Refer to Table 3-2 to assist you in selecting the
CV
Chg Done Time
setting based on the AHr capacity of your battery bank.
Note:
After choosing
Set CV Chg Done Time
, the
Set Max CC/CV Time
and
Set Recharge
Volts
settings must be determined (see next page).
Default:
2.0 Hrs
Range:
0.1-25.5 Hrs
* Set CV Chg Done Amps
– The
CV Chg Done Amps
setting is used when the DC
amperage supplied to the batteries (also known as “return amps”) determines when the
batteries are fully charged and the Constant Voltage stage needs to end. This setting
determines how long the charger will hold the battery voltage at the
CV Charge Volts
set-
ting—based on a minimum current setting (i.e., return amps). During the Constant Volt-
age charge mode, as the battery charges, the current from the charger slowly decreases.
When this current decreases below the
CV Chg Done Amps
setting, the charger transitions
to the Silent 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 To-
tal 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.
