Battery Charging - Xantrex 807-1055 Owner's Manual

Freedom HFS IC Owners Guide.book Page 25 Friday, September 11, 2015 2:54 PM

Battery Charging

Battery charging is possible only when shore power is present and
the Freedom HFS unit is connected to a battery (or battery bank).
The frequency of battery charging is determined by how much
energy in the battery is used up during inverting. Whenever the
Freedom HFS detects a battery voltage that falls below 12.8 volts,
the unit will begin charging the battery, that is, enter into bulk and
absorption stages then settle in float stage. If battery voltage does
not reach 5 volts after one minute or 10 volts after 15 minutes as
shown in the graph, the unit will terminate the charging process and
the error code  will show on the display screen.
Figure 3 illustrates the three-stage charging process used to
maximize Freedom HFS's charging efficiency.
Three-stage charging also applies when Custom Voltage profile is
selected.
975-0727-01-01
Voltage
Bulk Absorption
Absorption V
Float V
10V
5V
5 hrs
1 min
8 hrs
15 min
Current
Bulk Absorption
Charge
Current
Maximum
Setting
Charge
Current
Setting
Absorption
to Float
transition
Figure 3 Three-stage Charging Process
NOTE:
If an external DC load is
Float connected to the
battery and it drains the
battery down to 12.8
Vdc, the charger will
start a new bulk stage.
Time
NOTE:
During the Float stage,
Float
the charger will provide
up to the maximum set
charge current to
compensate for an
external DC load on
demand.
Time
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