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Battery Charging Reference
Equalize Charging
Many battery manufacturers recommend periodic equalize
charging to counter cell charge imbalance and capacity-
robbing electrolyte stratification. Equalizing helps to improve
battery performance and lifespan 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 37. 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.
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 defined by time only), the equalize
charge current is fixed at maximum 100% of the charge rate.
Equalization duration is fixed at one hour.
Table 22 Preset Equalization Voltage Settings
Battery Type
Preset Equalization Voltage
12V models 24V models
Flooded 16.0 32.0
Gel n/a n/a
AGM n/a n/a
Custom 16.0
(changeable) 32.0
(changeable)
FSW Owners Guide.book Page 83 Tuesday, August 7, 2018 9:03 AM