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24 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 1 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 below illustrates the three-stage charging process used to
maximize Freedom HF’s charging efficiency.
Table 3 illustrates the battery charging status as shown on the Status LED
and display screen.
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
Float
Current
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 24 Thursday, November 24, 2011 11:20 AM