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

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

maximize Freedom HF’s charging efficiency.

Current

 

 

 

 

Bulk

Absorption

Charge

 

 

 

 

 

 

 

 

 

Current

Maximum

 

Setting

Charge Current

 

 

 

 

Setting

 

Float

 

 

 

Current

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

Table 3 illustrates the battery charging status as shown on the Status LED and display screen.

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Freedom HF Owner’s Guide

Page 38
Image 38
Xantrex Technology 806-1840-01, 806-1020, 806-1840-02, 806-1055-02 manual Battery Charging, Voltage

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