Figure 3-3, Automatic 4-Stage Charging Graph - Magnum Energy ME3112-U Owner's Manual

Modifi ed sine wave inverter/chargers

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Table Of Contents

Table of Contents

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 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), 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), the unit will begin

another bulk charge.

* These settings in the ME 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.

Voltage

Time

Current