Magnum Dimensions ME-BMK, Руководство пользователя

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11 © 2016 Sensata Technologies
Operation
3.0 Using the BMK
This section explains how the ME-BMK battery monitor works.
IMPORTANT: Please refer to your remote/router owner’s manual
for detailed instructions on adjusting the charge ef fi ciency and amp-
hour size, and monitoring the various BMK meters.
3.1 How the BMK Battery Monitor Operates
The ME-BMK uses a precision resistor—known as a shunt—to
measure current fl ow into and out of the battery. The shunt provides
a small voltage to the BMK sense module that is proportional to the
current fl ow. When the battery current starts fl owing, the sense
module measures the amount of current removed from and returned
to the battery. The amount of current (or AH) removed or returned
is displayed on your remote/router as an “AH In/Out” value. This AH
in/out value is compensated by the Charge Effi ciency setting, which
accounts for energy losses while charging and is one of the factors
used to determine the battery’s State Of Charge (SOC).
The battery’s state of charge—which is the best indicator of the
condition of the batteries—is indicated on your remote/router’s SOC
display. This display shows that the batteries are fully charged (i.e.,
SOC = 100%) once the following three conditions have been met:
1. The charging voltage stabilizes over time (see Figure 3-1).
2. The charging current decreases to a low percentage of the
AH capacity—normally less than 2%.
3. The AH removed from the battery are within 1% of fully
being returned.
When the BMK sense module is fi rst connected, the batteries need
to be fully charged (i.e., SOC = 100%) at least once to establish a
SOC reference point. After the batteries have reached 100% SOC
and have discharged ≥ 0.5% of the battery capacity setting, the
charge ef fi ciency value is recalculated and the AH in/out read-out
resets to zero.
Info: To help maintain the accuracy of the SOC display and
to keep the batteries in good condition, occasionally they
must be charged to 100% (approximately once per week).
Info: Charging from a generator adds some concern about
the cost of fuel. A balance should be considered between the
use of fuel and the need to charge your batteries to 100%
SOC—to maintain the full service life of a battery. Batteries
discharged to 50% SOC and then normally recharged to 85-
90% SOC may be an ef fi cient compromise between fuel cost
and battery life. Trying to restore the last 10-15% of a full
battery charge may require a long time—typically several
hours.