Freedom HF InvChg Owners Guide.book Page 26 Tuesday, April 29, 2014 12:10 PM
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.
Voltage
Bulk | Absorption | Float |
Absorption V
Float V
10V
5V
1 min | 5 hrs | |
8 hrs | ||
15 min |
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.
Time
Figure 4 illustrates the three-stage charging process used to maximize Freedom HF’s charging efficiency.
Current
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| Bulk | Absorption |
Charge |
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Current | Maximum |
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Setting |
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Charge |
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| Current |
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Absorption | Setting |
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to Float |
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transition |
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Float |
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.
Time
Figure 4 Three-stage Charging Process
26 | Freedom HF Owner’s Guide |
