Silent, New charging cycle, Re-bulk – Outback Power Systems GS3548E Operators Manual User Manual

Page 33: Absorption timer, 31 f, Operation

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Operation

900-0145-01-01 Rev A

31

above that level. Often the timer will expire before the bulk and absorption stages are complete. If

this happens, the charger will not enter Float but will go directly to Silent. The charger only spends

time in Float stage if the timer is still running.
Time limit: Float Time setting. The charger will go Silent once the timer has expired (if another stage
is not still in progress.) The Float timer is reset to its maximum amount whenever the batteries
decrease to the

Re-Float Voltage setting.

To skip this step: Setting Float Time to 24/7 will cause the charger remain in Float continuously so
that the Float timer no longer applies. (The charger also skips Bulk, Absorption, and Silent.) However,

the charger can initiate a single three-stage charge if the criteria are met, after which it will return to

continuous Float again.

Silent

Following the expiration of the Float timer, the unit enters (or re-enters) the Silent stage. The unit

remains connected to the AC source, but the charger is inactive.
The unit will continue cycling between Float and Silent for as long as the AC source is present.

New Charging Cycle

If the AC source is lost or disconnected, the unit will return to inverting mode if enabled. The battery

voltage will begin to decrease due to loads or natural loss. When the AC source is restored, the

inverter will return to the charging cycle.

Re-Bulk

If the battery voltage decreases due to discharge, the inverter will restart the cycle as soon as the AC

source is available, beginning at Bulk stage.
Voltage Used: Re-Bulk Voltage setting. The default set point is 49.6 Vdc.
If the batteries do not decrease to the Re-Bulk point, the charger will not enter the Bulk stage and will

return to its previous stage.

Absorption Timer

Time limit: Absorb Time setting. The charger will not necessarily run through its full duration, as this

setting is not a required minimum period for Absorption. It is only a maximum limit. The duration of
Absorption is equal to the amount of time the battery voltage was less than the

Re-Bulk Voltage

setting, up to the maximum limit.
If the Absorption timer expired on the previous cycle, it is not reset afterward and retains a “remaining
run time” of zero. Whenever the battery voltage decreases to Re-Bulk or lower, the Absorption timer

will begin gaining time. For as long as the batteries remain below this voltage, the Absorption timer

will gain an equal amount of time. This controls the duration of the Absorption stage. The intent was

to avoid a “blind” cycle that operates regardless of conditions. The charger avoids maintaining the

batteries at high voltages for excessive or unnecessary time.
The Absorption timer continues this operation 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 Re-Bulk 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 remaining charging steps will proceed as described on the previous pages.

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