Magnum Energy ME-RTR Router - Manual (Page 45)

Page 37
©
2014 Magnum Energy, Inc.
Setup
◊ Set Absorb Done Amps – This setting is used when the DC amperage supplied to the
batteries determines when the batteries are fully charged. During Absorb Charge mode—as
the battery charges—the current required by the battery decreases. “Done amps” refers to
when the done amps decreases below the Absorb Done Amps setting continuously for two
minutes, the charger transfers from the Absorption charge cycle to the fi nal charge stage (see
03F Final Charge Stage). Most battery manufacturers use a specifi c formula to determine the
done 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 done 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: Amps = 20 ADC
Range: 0-250 ADC
Info: Setting the Absorb Done Amps value to 0 (zero) will keep the charger in the
Absorption Charge mode until the 03E Max Charge: Time setting is reached.
Info: When using Absorb Done Amps, the charger stays in Absorption Charge mode for
a minimum of 2 mins—even if the done amps is below the Absorb Done Amps setting.
Info: If DC loads are connected to the batteries, the Absorb Done Amps setting should
not be used. In order to charge the batteries—plus run the DC loads—the charger
must increase the current delivered to the battery bank. This scenario could result in
overcharging the batteries since the done amps reading will be skewed by the DC loads.
Info: It is highly suggested that you install a battery monitor (ME-BMK or ME-BMK-NS) if
this setting is used. If a battery monitor is not installed, this setting relies on the METER
menu’s 01B Inv/Chg DC Amps value to determine when to transfer out of Absorption
Charge mode. When a battery monitor is installed, the Absorb Done Amps setting relies
on the METER menu’s 05C DC Amps–BMK value to determine when to transfer out of
Absorption Charge mode. This is the most accurate DC amperage measurement.
◊ Set Absorb Done SOC – This setting can be used if a battery monitor kit is installed, and
you want to use the SOC (State of Charge) of the battery bank to determine when the batteries
are fully charged. During the Absorption Charge mode, once the METER/05 BMK Meters/05A
SOC menu reaches the Set Absorb Done SOC setting, the charger transfers to the fi nal charge
stage (see 03F Final Charge Stage).
Note: SOC is the best way to determine when the batteries are fully charged—any DC loads
or other charge sources connected to the battery bank will not affect the SOC reading.
Default setting: Absorb Done SOC = 100%
Range: 50-100%
Info: A ME-BMK is required in order to use this setting. If the Absorb Done SOC setting
is selected and there is no ME-BMK installed in the system, or if there is not a valid SOC
number displayed under the METER/05 BMK Meters/05A SOC menu (i.e., Think’n, No
Comm, Pwr-up Fault, or Factory Fault are not valid SOC numbers), then the charger
uses the SETUP: 03D Set Absorb Done Time setting—even if this setting is not enabled—
to determine how long the charger stays in the Absorption Charge mode.
Info: If the Absorb Done SOC setting is used when charging from a generator source,
then it is recommended that a setting of less than 100% be used (usually around 90%
is acceptable). Running the generator higher than 90% is sometimes considered an
ineffi cient use of fuel. However, if a setting lower than 100% is used, then the batteries
should be charged to 100%, at least once a week, to make sure damage is not done to
the batteries by not bringing them to a full charge state.
Info: If the Absorb Done SOC setting is active, the charger will go into Bulk Charge
mode each time AC is connected.