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Menu Item Descriptions
976-0043-01-02 6–17
Absorption Stage Absorption charge is the second stage of battery charging and provides
the batteries a controlled, constant voltage for a set period of time. During
this stage, the current supplied to the batteries slowly decreases. When
this current decreases to or below the setting in menu item 12F Bulk
Done Amps AC, the charger switches to the Finish stage.
Finish Stage The Finish Stage contains two selections for the final stage of battery
charging: Silent or Float Modes as described below.
Float Mode Float charge maintains a trickle charge on the batteries
whenever AC is present on the inverter’s input. Float charging reduces
battery gassing, minimizes watering requirements (for flooded batteries),
and ensures the batteries are in a constant state of readiness. When this
mode is selected, the charger will automatically switch to the float stage
after the batteries have received a bulk and absorption charge. The
batteries will be maintained at the level set in menu item
12C Float Volts DC.
Silent Mode After a bulk and absorption charge cycle is complete, the
charger will shut down (go silent). AC voltage on the inverter’s input will
pass-through to the loads. The charger continues to monitor the battery
voltage in this mode and starts a float charge when certain conditions are
met:
• The batteries have discharged below the setting in menu item
20A Refloat Low Volts DC.
• The battery voltage has increased above the value set in menu
20B Refloat High Volts DC.
Note: If there are DC loads on the batteries, the charger’s current may never
decrease to a level to initiate the finish stage of charging. To ensure the charger
does not stay indefinitely in the bulk stage, set the adjustable timer menu item
12H Max Bulk/EQ Timer h:m to limit the time the batteries are bulk charged.
This timing circuit is activated at the start of the Absorption stage and
terminates bulk charging if the charge current does not decrease to the setting in
menu item 12F Bulk Done Amps AC before the 12H Max Bulk/EQ Timer
h:m setting is reached.
Note: The battery voltage can increase above the float voltage when using an
external charging device such as PV arrays, wind turbines, micro-hydro
generators, etc. Be sure to include appropriate charge management equipment
with all external DC sources.