Equalization, Operation – Outback Power Systems GS8048 Operator Manual User Manual
Page 26
Operation
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If the battery voltage drops below 48.0 Vdc, the timer increments (counts upward) at double the
normal rate. For example, if the batteries spent 8 minutes below this voltage, 16 minutes would be
added to the Absorption timer. Similarly, if the battery voltage drops below 47.2 Vdc, the timer
increments at quadruple the normal rate.
The Absorption timer continues this behavior even if the charger is still on. For example, if the charger
is in Float stage and there is a significant battery drain, the charger may not be able to maintain the
batteries at the Float voltage. Once the batteries fall below the Rebulk point, the Absorption timer will
begin accumulating time. (However, the accumulation will be minor, as this will also cause the
charger to re-enter the Bulk stage.)
The timer will stop incrementing when it reaches the
Absorb Time setting. This is the maximum
duration of the Absorption stage. This means that regardless of the voltage, the timer will always run
for the full Absorption period if the batteries dropped below the appropriate voltage for that amount
of time. If significant battery drain caused the batteries to drop below the set points for doubling or
quadrupling the rate, the charger may run for the full Absorption period even after a lesser amount
of time.
The rest of the charging stages will proceed as described on the previous few pages.
Equalization
Equalization is a controlled overcharge that is part of regular battery maintenance. Equalization
brings the batteries to a much higher voltage than usual and maintains this high voltage for a period
of time. This has the result of removing inert compounds from the battery plates, and reducing
stratification in the electrolyte.
Equalization follows the same pattern as standard three-stage charging, as shown in the figures on
page 21. However, instead of the Absorption voltage and time set points, it is controlled by the
Equalize Voltage and Equalize Time settings in the MATE3.
This process must be started manually using the MATE3. The inverter cannot be programmed for
automatic battery equalization. This is a safety measure.
Equalization is normally performed only on flooded lead-acid batteries. The schedule for equalization
varies with battery use and type, but it is usually performed every few months. If performed correctly,
this process can extend battery life by a considerable amount.
Equalization is not normally performed on nickel-technology batteries or any sort of sealed battery.
CAUTION: Battery Damage
Do not equalize OutBack EnergyCell batteries of any model.
Do not equalize any sealed battery types (VRLA, AGM, Gel, or other) unless
approved by the manufacturer. Some batteries may suffer severe damage
from equalization.
Contact the battery manufacturer for recommendations on equalization
voltage, duration, schedule, and/or advisability. Always follow
manufacturer recommendations for equalization.