Xantrex Technology HF 1800, HF 1000 manual Battery Charging, 1 Three-stage Charging Process

Battery Charging

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 Vdc, 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 Vdc after 1 minute or 10 Vdc after 15 minutes as shown in the graph, the unit will terminate the charging process and the error code E12 will show on the display screen.

Figure 4-1below illustrates the three-stage charging process used to maximize Freedom HF’s charging efficiency.

	Voltage							NOTE:
								If an external DC load is
				Bulk Stage Absorption Stage			Float Stage
Absorption								connected to the battery
								and it drains the battery
Voltage
								down to 12.8 Vdc, the
Float Voltage								charger will start a new
	10V							bulk stage.
	5V
								Time
		1 min				5 hrs Max
			15 min		8 hrs Max

Current

NOTE:

Charge Current Setting

Bulk Stage Absorption Stage Float Stage

Maximum

Charge Current

Setting

During the Float stage, the charger will provide up to the maximum set charge current to compensate for an external DC load on demand.

Float Current

Time

Figure 4-1Three-stage Charging Process

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