Smart Charge Algorithm With Optional Reconditioning For Lead-Acid Batteries - Victron energy Blue Smart IP22 Manual

3. Charge algorithms

3.1 Smart charge algorithm with optional reconditioning for lead-acid batteries

Charge voltages at room temperature:
MODE
NORMAL
HIGH
LI-ION
For 24V chargers: multiply all voltage values by 2.
NORMAL (14,4V): recommended for flooded flat plate lead antimony batteries (starter batteries), flat plate gel
and AGM batteries.
HIGH (14,7V): recommended for flooded lead calcium batteries, Optima spiral cell batteries and Odyssey
batteries.
The MODE button
After connecting the charger to the AC supply, press the MODE-button to select another charging algorithm if
required (the charger remembers the mode when disconnected from the mains and/or the battery).
If reconditioning is selected, the RECONDITION LED will be on, and will flash when reconditioning is active.
The charger switches to NIGHT by pressing the MODE button during 3 seconds. The NIGHT LED will turn on.
The NIGHT mode automatically ends after 8 hours, and can be ended earlier by again pressing the MODE button
during 3 seconds.
The charger switches to LOW by pressing the MODE button during 6 seconds. The NIGHT LED will blink twice
per second. The LOW mode remains activated until the MODE button is pressed again during 6 seconds.
When NIGHT or LOW are on, the output current is reduced to max. 50% of the nominal output and the charger
will be totally noiseless.
Seven step charge sequence for lead-acid batteries:
1. BULK
Charges the battery with maximum current until absorption voltage is reached. The battery will then be about
80% charged and is ready for use.
2. ABS - Absorption
Charges the battery at constant voltage and with decreasing current until it is fully charged.
See table above for absorption voltage at room temperature.
Adaptive battery management:
The absorption time is short (minimum 30 minutes) if the battery was (nearly) fully charged and increases to
8 hours in case of a deeply discharged battery.
3. RECONDITION
Optional reconditioning for deeply discharged lead-acid batteries.
Reconditioning is applicable to the charge algorithms NORMAL and HIGH and can be selected by pressing
the MODE button one more time after selection of the required algorithm.
When in RECONDITION mode the battery will be charged with low current up to a higher voltage at the end
of the absorption phase.
The RECONDITION LED will be on during charging, and will blink during the reconditioning period.
During reconditioning the maximum current is equal to 8% of the nominal current until the maximum voltage
is reached. Reconditioning is terminated after one hour or when the maximum voltage is reached, whichever
comes first. See table.
Example:
For a 12/30 charger: the recondition current is 30 x 0,08 = 2,4A.
ABS FLOAT
V V
14,4 13,8
14,7 13,8
14,2 13,5
STORAGE
V Max V@% of Inom
13,2 16,2@8%, max 1h
13,2 16,5@8%, max 1h
13,5
RECONDITION
n.a.