Magnum Energy MM Series Installation And Operation Manual page 30

3.0 Operation
When an AC source (utility power or generator) is connected to the
inverter that has the battery charger, the inverter will begins to
monitor the AC input for acceptable voltage. Once the inverter has
accepted the AC input, the AC transfer relay will close and the
Charge Mode will begin. After you are in the Charge Mode, the DC
voltage will be monitored to determine how to charge. If the DC
voltage is 12.9 VDC or less, the charger will go to Bulk Charging. If
the DC voltage is greater than 12.9 VDC, the charger will skip the
initial Bulk/Absorb charging stages and go directly to Float Charging.
While charging, the unit may go into Charger Back-off protection,
which automatically reduces the charge current to the batteries. This
is caused by: 1. The internal temperature is too hot - the charger
automatically reduces the charge rate to maintain temperature; or 2.
The AC input voltage falls below 85 VAC - the charger reduces the
charge current to zero to help stabilize the incoming AC voltage.
The Charge Mode provides up to four separate charging stages: Bulk
Charging, Absorb Charging, Float Charging and Full Charge.
Bulk Charging; This is the initial stage of charging. While Bulk
Charging, the charger supplies the battery with controlled constant
current. The charger will remain in Bulk charge until 14.6 VDC* is
achieved (determined by the Battery Type selection**).
Absorb Charging; This is the second charging stage and begins after
the bulk voltage has been reached. Absorb Charging provides the
batteries with a constant voltage and reduces the DC charging current
in order to maintain the bulk voltage setting. The Absorb Charging
time is 120 minutes (determined by the Battery AmpHrs selection**).
Float Charging; The third charging stage occurs at the end of the
Absorb Charging time. While Float charging (also known as a mainte-
nance charge), the batteries are kept fully charged and ready if
needed by the inverter. In this stage, the charge voltage is reduced to
13.4 VDC* (determined by the Battery Type selection**) which can
maintain the batteries indefinitely.
Full Charge (Battery Saver™ mode); The fourth stage occurs after
four hours in the float charging stage. The Full Charge stage maintains
the batteries without overcharging, preventing excessive loss of water
in flooded batteries or drying out of GEL/AGM batteries. In this stage
the charger is turned off and begins monitoring the battery voltage; if
the battery voltage drops to 12.9 VDC, the charger will automatically
initiate another four hours in Float Charge.
Note: If the battery voltage falls to 12.1 VDC or less, the unit
will begin another Bulk charge.
* These voltage settings are based on the Battery Temperature
Sensor (BTS) disconnected or at a temperature of 77° F (25° C). If
the BTS is installed, these voltage settings will increase if the
temperature around the BTS is below 77° F (25° C) and decrease if
the temperature around the BTS is higher than 77° F (25° C).
** The MM Series uses changeable settings (see Table 5, Inverter
Default Settings) that are adequate for most installations, however, if
you determine that some of your operating parameters need to be
changed, the ME-RC50 remote control can be purchased to allow
changes to those settings.
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