Product Manual

Operation
28 900-0161-01-01 Rev B
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.
Figure 2 Charging Stages Over Time
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.
Figure 3 Charging Stages Over Time (24/7)
Voltage
Time
Inverter now charging to a new set point
Inverter has reached the charging set point
Inverter completed charging; the previous set point is no longer in use
Bulk
ReFloat
Absorption Float Silent
Absorption
Set Poin
t
Float
Set Point
Re-Float
Set Point
No Charge
Silent ReFloat
Float
Silent
Refloat
Voltage
Inverter now charging to a new set point
Inverter has reached the charging set point
No Charge (Source Removed)
Time
Absorption
Set Poin
t
Float
Set Poin
t
Bulk Absorption Float
No Charge