Magnum Energy Battery Monitor Kit ME-BMK - Manual (Page 21)

17 © 2010 Magnum Energy, Inc.
Using the ME-ARC50 Remote with the BMK
4.2 Adjusting 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 by the user (see Figure 4-2).
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 amp-hrs are removed
from the battery, the AH Net display would read 000 only after 111AH have been
returned to the battery.
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 ME-ARC50 remote’s METER pushbutton.
To access the AH I/O reading: press the METER pushbutton, 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.
After several charge and discharge cycles (below 80% SOC), the AH I/O read-
ing should be slightly positive when the SOC display reads 99%.
To view the SOC display: press the METER pushbutton 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.
4.3 Adjusting the AmpHr Size Setting
It’s important that the AmpHr Size setting is correct or else the calculations used
to determine the battery’s SOC display will be inaccurate.
To adjust the AmpHr Size setting: press the SETUP pushbutton and turn
the SELECT knob until the 05 BMK Setup menu appears. Press the SELECT
knob to display the 05A Charge Eff menu item. Turn the SELECT knob to
display the 05B AmpHour Size menu with the current AmpHrs Size setting
shown. Press the SELECT knob to access the Set AmpHr Size function. Turn
the SELECT knob to adjust the AmpHr Size setting. Press the SELECT knob
to select and save the new setting.
press to
save
SETUP
press
Status…
05 BMK Setup
rotate to
press to select
(press again to adjust)
rotate to
desired
selection:
Set Charge Eff
Auto
Set Charge Eff
60%
Set Charge Eff
50%
Set Charge Eff
97% .......
Figure 4-2, Adjusting the Charge Efficiency Setting (ME-ARC50)