Installation Manual

Setup

Page 40

Where should I set my Max Charge Time? In order to ensure a complete charge cycle is

accomplished, adjust the Max Charge: Time setting to a time period that is normally longer than

the settings in the following SETUP menus: 03D Absorb Done Time, Absorb Done Amps, and

Absorb Done SOC. The Max Charge: Time setting has priority over these menus and stops the

charge cycle once that setting is satisﬁ ed.

Example: The Max Charge: Time setting is 6 hours, but the Absorb Done Time setting is 8 hours.

After 6 hours in the absorption charge cycle, the charger transitions to the Final Charge stage.

• 03F Final Charge Stage: The Final Charge Stage setting determines what charge stage(s)

occurs after the absorption charge stage has ﬁ nished.

Note: If “CC/CV Controlled” displays on this menu’s screen, you will not be able to adjust the

settings as “CC/CV” has been selected as the battery type from the 03C Battery Type menu.

Default setting: Final Charge Stage = Multi-Stage

Range: Multi-Stage, Float, Silent

◊ Set Final Charge Stage = Multi-Stage – The Multi-Stage setting transitions from the

Absorption charge stage to Float charge stage. Once in the Float stage for four hours with no

DC load on the batteries, the charger enters the Full Charge stage (i.e., Battery Saver mode).

In Full Charge mode, the charger automatically stops charging but is still on and actively

monitoring the battery voltage. The charger remains in the Full Charge stage until the battery

voltage drops below 12.7 VDC for 12-volt batteries (25.4 VDC for 24-volt batteries, and 50.8

VDC for 48-volt batteries), at which time it returns to the Float stage. The charger continues

to cycle between Float and Full Charge as long as incoming AC is available. See Figure 3-14.

Note: These battery voltages are the fully charged voltages of a battery at rest.

Info: When Multi-Stage is selected and the charger goes to Full Charge mode, if another

charge source (such as PV or wind) is charging the batteries above the fully charged

voltage, the charger remains in the Full Charge stage.

Why should I use Multi-Stage? Multi-Stage is the most commonly used charge mode. It is

suitable for most applications and assures a full charge to the batteries, without overcharging.

If there is another alternate charge source charging the batteries (PV, wind or hydro), then

Multi-Stage mode uses the inverter/charger to complete a full charge. The inverter/charger

transitions to Full Charge mode, and the alternate charge source then maintains the battery

voltage. If the alternate source is unable to maintain the voltage, the charger enters Float mode

for another 4-hour period. The Full Charge feature in the Multi-Stage mode also helps reduce

water consumption in ﬂ ooded batteries when they are left in the charge mode for extended

periods, such as in a backup power application.

◊ Set Final Charge Stage = Float – The Float stage is a maintenance charge mode that

maintains a constant voltage—while delivering up to the maximum rated current of the

charger in order to power any DC loads connected to the batteries. Most 3-stage chargers

ﬁ nish the charge mode in Float, and remain in Float as long as an AC source is available on the

input of the charger. The ﬂ oat voltage is determined by the battery type selected in the 03C

Battery Type menu. Unlike Multi-Stage mode, in Float mode there is no Full Charge feature.

See Figure 3-15.

Why should I use the Float Charge Stage? Float mode is typically used when the charger is

the only charge source connected to the batteries. This mode maintains the batteries at the ﬂ oat

voltage. If using ﬂ ooded batteries and the charger is in ﬂ oat for an extended period, the water

level should be checked every two to three weeks for proper levels.