Outback Power Systems GS4048A Operators Manual - Manual (Page 30)

Operation
28 900-0161-01-00 Rev A
between steps are marked with vertical dotted lines. A circle indicates that the inverter has begun
charging to a new voltage setting. A square indicates that the inverter has reached the setting (a
horizontal dotted line). A triangle indicates that the inverter has stopped charging and is no longer
using the previous set point. (The charging may have stopped for any of several reasons.) The battery
voltage must drop to one of several low set points before the inverter resumes charging.
Specialized Charging
Lithium-ion, sodium-sulfur, and similar advanced battery technologies may require charger settings
that are very different from the inverter’s defaults or the three-stage cycle in general. The Charging
Steps section describes the individual selections and behavior. All charger settings are adjustable.
The selection range for each step allows very different priorities from the defaults. For example, the
Float voltage could be set higher than the Absorption voltage, or a step could be completely skipped.
Charging Graphs
Figure 4 shows the progression of steps of the three-stage charging cycle.
Figure 4 Charging Stages Over Time
Figure 5 shows the charge cycle used by the inverter when the Float Time menu item is set to 24/7.
This setting eliminates the Silent and Float Timer steps. The charger remains in Float continuously.
The Float stage lasts until the AC source is removed.
Figure 5 Charging Stages Over Time (24/7)
Absorption
Set Point
Float
Set Point
Bulk
(c.c.)
Silent
Float Timer (c.v.) Silent Float
(c.c.)
Float Timer
Re-Float
Set Point
No
Charging
Float
(c.c.)
Silent
Float
Timer
(c.v.)
Float
(c.c.)
Absorption (c.v.)
c.c. = Constant-Current Stage; charger can deliver up to inverter’s maximum (or maximum setting)
c.v. = Constant-Voltage Stage; charger delivers the current needed to maintain voltage; usually tapers
Voltage
Time
Bulk
(c.c.)
Float (c.v.)
Absorption (c.v.)
No Charge
(Source removed)
Time
Absorption
Set Point
Float
Set Point
No
Charge
Voltage
c.c. = Constant-Current Stage; can deliver up to the inverter’s limit
c.v. = Constant-Voltage Stage; delivers only the current needed to maintain voltage; usually tapers