Figure 3-7, Automatic 4-Stage Charging Graph - Sensata Magnum Energy MS Series Owner's Manual

Pure sine wave inverter/charger

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Table Of Contents

Table of Contents

Operation

The Charge mode provides up to four separate charging stages: Bulk Charging, Absorb Charging,

Float Charging and Full Charge (Figure 3-7).

Bulk Charging: This is the initial stage of charging. While bulk charging, the charger supplies the

battery with controlled constant current. The charger remains 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 on 12-volt models, 25.4 VDC or less on 24-volt models, and

50.8 VDC or less on 48-volt models), 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 on 12-volt models,

24.2 VDC on 24-volt models, and 48.4 VDC on 48-volt models) or lower, the unit will

begin another bulk charge.

* These settings in the MS 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