Magnum Energy ME-G Series - Manual (Page 41)

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2015 Sensata Technologies Page 32
Operation
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 90 VAC—the charger stops charging 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 (see Figure 3-3).
Bulk Charging: This is the initial stage of charging. While bulk charging, the charger supplies the
battery with constant current. The charger will remain in bulk charge until the absorption charge
voltage (determined by the Battery Type selection*) is achieved. The inverter’s green LED stays
ON (solid) to indicate bulk charging.
Absorb Charging: This is the second charging stage and begins after the absorb voltage has
been reached. Absorb charging provides the batteries with a constant voltage and reduces the DC
charging current in order to maintain the absorb voltage setting. The inverter’s green LED fl ashes
once every second (medium fl ash) to indicate absorption charging for 2 hours (determined by the
Battery AmpHrs selection*), then switches to fl oat charging.
Float Charging: The third charging stage occurs at the end of the absorb charging time. While
fl oat charging, the charge voltage is reduced to the fl oat charge voltage (determined by the
Battery Type selection*). In this stage, the batteries are kept fully charged and ready if needed by
the inverter. The inverter’s green LED fl ashes once every 8 seconds (slow fl ash) to indicate fl oat
charging. The Float Charging stage reduces battery gassing, minimizes watering requirements
(for fl ooded batteries), and ensures the batteries are maintained at optimum capacity.
Full Charge (Battery Saver™ mode): The fourth stage occurs after four hours in the Float
Charging stage. The Full Charge stage is designed to keep batteries fully charged over long
periods, and to prevent excessive loss of water in fl ooded 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 low (12.7 VDC or less), the charger automatically initiates another four
hours in fl oat charge.
Info: If the battery voltage falls to the re-bulk voltage (12.1 VDC) or lower, the unit will
begin another bulk charge.
* These settings in the ME-G Series are changeable and leave the factory with default values (see Table 3-2,
Inverter/Charger Default Values). These default values are adequate for most installations, however, if you
determine that some of the values need to be changed for your particular system, a remote control may be
purchased to adjust these settings.
Figure 3-3, Automatic 4-Stage Charging Graph
Constant
Current
Reduced
Current
Reduced
Voltage
Absorb
volts
Max
Charge
Rate
Increased
Voltage
Constant
Voltage
Monitored
Voltage
No Current
Monitored
Current
Bulk
Charging
Absorb
Charging
Float
Charging
Full
Charge
Goes to Full
Charge after
4 hours in
Float Charge Absorb
Time
Float
volts
Time
DC
Voltage
DC
Current