Magnum Energy ME-RTR Router - Manual (Page 114)

Page 106
Using a BMK: Setup
Figure 8-2, Accessing the Battery AmpHrs Size Setting
CAUTION: The factory default charge effi ciency setting is Auto, which allows the charging
effi ciency to be automatically calculated. In most circumstances, this setting determines
the best charge effi ciency. If you do not know your battery’s charging effi ciency, leave it
at the factory default setting. If the setting is manually set but incorrect, the state-of-
charge information will become more inaccurate with every charge.
What is Charge Effi ciency? When a certain amount of energy is removed or discharged from
the battery, this removed energy will need to be returned to keep the batteries at a 100% state
of charge. As batteries are being charged, they lose energy; either in the form of heat, or while
gassing. This loss of energy while charging means the battery will not be fully charged if you only
return the current that was removed. To compensate for the battery’s ineffi ciencies while charging,
a charge effi ciency setting is provided. The charge effi ciency setting compensates the AH I/O (AHrs
In/Out) reading by ensuring the AHrs returned to the battery are greater than the AHrs removed.
Example: AH I/O display reads “000”. When powering a 25-amp load for two hours, the display
will show “-050”. You have discharged 50 AHrs (2 x 25) from the battery. If the charge effi ciency
setting is 95%, then as you begin charging and return 50 AHrs, the AH I/O reading will be less than
zero—indicating that the AHrs removed have not been fully returned. The 95% charge effi ciency
setting requires 52.5 AHrs (50/95) to be returned before the AH I/O returns to 0.
• SETUP: 05B Battery AmpHrs Size – The Battery AmpHrs (Amp-Hours) Size represents the
amount of energy the battery can deliver. This setting is used by the battery monitor to help
calculate the battery’s SOC (State of Charge).
Default setting: 400 AmpHrs
Range: 200-2500 AmpHrs
Note: It’s important that the Battery AmpHrs Size setting is correct or else the calculations used
to determine the battery’s SOC display will be inaccurate.
Adjusting the AmpHrs Setting – From the BMK home screen (see Info in Section 8.1), press
the SETUP button. Turn the SELECT knob until the 05B Battery AmpHrs Size display appears.
Press the SELECT knob to access the Set Battery AmpHrs Size function. Turn the SELECT knob to
adjust the amp-hours setting. press the SELECT knob to save the new setting (see Figure 8-2).
Where do I set the Absorb Time setting? Select the setting based on the 20-hour AH capacity
of your battery bank. Refer to the battery manufacturer for the 20-hour AH capacity.
How do I determine my Battery Amp-Hour capacity? The batteries should be deep-cycle
type and rated either by AHrs or reserve capacity in minutes.
• Amp-hour (AH) capacity is a measurement of how many amps a battery can deliver for a
specifi ed length of time (usually 20 hours) until the voltage achieves 1.75 VDC/cell at 80° F.
• Reserve Capacity (RC) is a measure of how many minutes a battery can deliver a certain
amount of current (usually 25A) and maintain a voltage above 1.75 VDC/cell at 80° F. If
using the Reserve Capacity (25A), the 20-hour AH capacity can be estimated by multiplying
‘minutes reserve capacity’ by 50%.
Note: For batteries in parallel strings, add the amp-hour capacity of each string (Example: three
250AH batteries in parallel = 750 AH); for batteries in series, use the amp-hour capacity of one
battery (Example: three 250 AH batteries in series = 250 AH).
press to
save
SETUP
press
05B Battery AmpHrs
Size = 400 AHrs
P## View BMK SETUP
rotate to:
press to adjust
setting
rotate to
desired
setting:
Set Battery AmpHrs
Size = 400 AHrs
P## eDIT BMK SETUP
Set Battery AmpHrs
Size = 2500 AHrs
P## EDIT BMK SETUP ..
From the BMK
Home screen:
Set Battery AmpHrs
Size = 200 AHrs
P## Edit BMK SETUP ..