Charge Cycle; Figure 2 Charging Stages Over Time; Figure 3 Charging Stages Over Time (24/7) - Alpha OutBack Power Radian Series Operator's Manual

Operation
Limiting Charge Current (Multiple Inverters)
It is not advisable to set Charger AC Limit less than 12 Aac in a stacked system. The Power
Save function requires the master inverter to activates the slave chargers in sequence only
when the charge current exceeds 11 Aac. If the setting is less than 12, Power Save will not
activate any other chargers.
For more information on this function, see the Power Save section in the Installation Manual.
In some systems, lower currents may be required due to battery bank size or other reasons. To
achieve lower currents, chargers can be individually set to Off so that the master inverter does not
activate them.
For the location of the Charger Control command, see the menu tables beginning on page 63.
For more information on controlling the charger limits in a stacked system, see page 61.

Charge Cycle

The Radian inverter uses a "three-stage" battery charging process with Bulk, Absorption, and
Float stages. These stages follow a series of steps, which are shown on graphs and described
beginning below. The inverter's factory default settings are intended for three-stage charging of
lead-acid batteries.
Charging Graphs
Figure 2 shows the progression of steps of the three-stage charging cycle.
Voltage
No Charge
Absorption
Set Point
Float
Set Point
Re-Float
Set Point
Inverter now charging to a new set point
Inverter completed charging; the previous set point is no longer in use
Figure 3 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 Refloat steps. The charger remains in Float
continuously. The Float stage lasts until the AC source is removed.
Voltage
No Charge
Absorption
Set Point
Float
Set Point
Inverter now charging to a new set point
Figure 3
28
Bulk Absorption Silent
Time
Figure 2 Charging Stages Over Time
Bulk Absorption
Time
Charging Stages Over Time (24/7)
ReFloat Float Silent ReFloat
Inverter has reached the charging set point
Float
Inverter has reached the charging set point
Silent Refloat
Float
No Charge (Source Removed)
900-0161-01-01 Rev B