Freedom SW 3K2K InvChg Owners Guide.book Page 63 Wednesday, October 9, 2013 1:34 PM

Battery Charging Reference

Equalize Charging

If the battery capacity is set to zero (Ah=0 effectively disables the exit

current criteria for the absorption charge stage making the absorption stage

 

Many battery manufacturers recommend periodic equalize charging to

defined by time only), the equalize charge current is fixed at maximum

100% of the charge rate.

counter cell charge imbalance and capacity-robbing electrolyte

 

stratification. Equalizing helps to improve battery performance and lifespan Equalization duration is fixed at one hour.

by encouraging more of the battery material to become active.

 

Battery equalization is a controlled overcharging method that mixes up stratified electrolyte and reactivates unused areas of the plate material. Periodic equalizing can help to regularly restore batteries to a full and healthy state of charge.

Consult the battery manufacturer's recommendation for equalize charging settings. Sealed batteries should never be equalized. Consult the battery manufacturer for optimal charging procedures when using sealed batteries.

When Equalize mode is enabled, the battery is charged from bulk to absorption, and then to the equalize phase. The Freedom SW will transition from the absorption phase to equalize if:

the DC charge current is below 2% of the configured battery capacity (for example, 8.8A for 440Ah).

the absorption time is exceeded (for example, 180 min).

After absorption, the maximum charge DC current is set to 10% of battery capacity (for example, 44A for 440Ah). See Figure 34. This constant current charge will continue until the voltage has increased to the equalize voltage at which point the battery will be regulated at the temperature-compensated equalize voltage.

Bulk Stage

Absorption Stage

Equalize Stage

Battery

 

 

Voltage

 

Equalize Voltage

Bulk Voltage

 

Absorption Voltage

 

 

 

 

 

Equalize mode

 

 

Custom Charge

 

 

Time

Max Absorb Time - Dflt 3 hrs (adjustable 1 min - 8 hrs )

Battery

Current

 

Equalize Timer

 

1hr fixed

Absorption Exit Current

10% of programmed AH

Threshold = 2% of

capacity

programmed AH capacity

 

 

Time

Figure 34 Equalize Charging

 

 

97-0019-01-01

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Image 77
Xantrex Technology 815-3012, 815-3024, 815-2012, 815-2024 manual Equalize Charging

815-2024, 815-2012, 815-3012, 815-3024 specifications

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