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26 Freedom HF Owner’s Guide
Battery Charging
Battery charging is possible only when shore power is present and
the Freedom HF 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 HF detects a battery voltage that falls below 12.8 volts, the
unit will begin charging the battery, i.e., 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 4 illustrates the three-stage charging process used to
maximize Freedom HF’s charging efficiency.
Figure 4 Three-stage Charging Process
15 min
Absorption V
Float V
10V
Absorption Bulk Float
8 hrs
5 hrs
Voltage
Time
Charge
Current
Setting
Absorption
to Float
transition
Absorption Bulk Float
Current
Time
NOTE:
If an external DC load is
connected to the
battery and it drains the
battery down to 12.8
Vdc, the charger will
start a new bulk stage.
NOTE:
During the Float stage,
the charger will provide
up to the maximum set
charge current to
compensate for an
external DC load on
demand.
Maximum
Charge
Current
Setting
5V
1 min
Freedom HF InvChg Owners Guide.book Page 26 Tuesday, April 29, 2014 12:10 PM