Monitoring The Bmk - Magnum Energy ME-ARC Series Owner's Manual

How should I adjust the Charge Effi ciency Setting? The charge effi ciency
setting allows the battery monitor to calculate the battery's charge effi ciency.
The charge effi ciency can be calculated automatically using the Auto setting,
or can be manually programmed (see Figure 8-1).
The battery monitor is shipped with the charge effi ciency set to Auto. This
allows the battery monitor to automatically calculate variables that affect the
charging effi ciency such as battery type, battery age, and how the batteries
are maintained—which is not always constant. With the Auto setting, the
effi ciency is recalculated each time the batteries reach a 100% state of
charge. This setting can also be manually adjusted from 50% to 97% if the
battery's charge effi ciency is known. When using a setting other than the Auto
setting, the battery monitor will use the manual setting to calculate the AH I/O
display. For example, if you set the charge effi ciency to 90% and 100 AHs are
removed from the battery, the AH Net display would read "000" only after 111
AHs have been returned to the battery.
Again, if the charge effi ciency is manually set and inaccurate, the SOC information
will be more inaccurate with every charge. For this reason, continually monitor
the AH I/O reading under the ARC's METER button.
To access the AH I/O reading: press the METER button, turn the SELECT
knob until the 04 BMK Meters menu appears, and then press the SELECT knob.
Turn the SELECT knob until the 04E AH In/Out display appears (see Figure 8-1).
After several charge and discharge cycles (below 80% SOC), the AH I/O reading
should be slightly positive when the SOC display reads 99%.
To view the SOC display: press the METER button and turn the SELECT knob
until the 04 BMK Meters menu appears. Press the SELECT knob, and then turn the
SELECT knob until the 04B SOC display appears. If the AH I/O reading is below
000 (negative number) when the SOC display reads 99%, then increase the charge
effi ciency setting. If you fi nd that the AH I/O reading is substantially above zero
when the SOC display reads 99%, then decrease the charge effi ciency setting.
• 05B AmpHour Size – This setting is used to calculate the battery's
SOC reading.
Default setting: 400 AH
Range: 200-2500 AH
CAUTION: It is important that the AmpHr Size setting is correct or
else the calculations used to determine the battery's SOC display
will be inaccurate.
How do I access the AmpHr Size setting? Press the ARC's SETUP button,
turn the SELECT knob until the 05 BMK Setup menu appears, and then press
the SELECT knob to display the 05A Charge Eff menu item. Turn the SELECT
knob to the 05B AmpHour Size menu—the current AHs size setting displays.
Press the SELECT knob to access the Set AmpHr Size function.
To adjust the AmpHr Size setting: From the Set AmpHr Size function screen,
turn the SELECT knob to adjust the AH size setting. Press the SELECT knob to
select and save the new setting.

8.2 Monitoring the BMK

Use the ARC remote's METER button to monitor battery bank information and
to determine the status of your battery system.
© 2012 Magnum Energy, Inc.
8.0 Using a BMK
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