Specifications are subject to change. See bluesea.com/P12 for current information.
Absorption Parameters and Timers
14
CAUTION
The default Absorption Timer values are set to satisfy a majority of the battery configurations that exist. Unwarranted changes to Absorption timers could
result in damage to the batteries and reduced battery life. To optimize Absorption Timer based on specific configurations, please contact your
battery manufacturer for setting guidelines for your specific battery.
The Absorption stage is the charging stage in which a battery “fills” to max capacity. Absorption timers help define the amount of time a battery bank will
remain in the Absorption stage. Having a correct Absorption time is vital for optimum charging of a battery bank. Under Absorption can lead to a battery
being consistently under-charged causing sulfate buildup. Over Absorption can dry out the electrolytes in a battery. Both of these conditions can lead to
reduced battery life.
There are three user selectable parameters that help define when a connected battery bank will be moved from Absorption to either Pre-Float, or Float.
Minimum Absorption Time:
1 hour default
The minimum amount of time a battery bank will be in Absorption. The battery charger will not move a battery from Absorb to Float unless the Minimum Absorption Time is met.
Maximum Absorption Time:
4 hour default
The maximum amount of time a battery bank can remain in Absorption. While still maintaining its Absorption voltage, if a battery has been in Absorption for the maximum
designated time it will move into Float even if End Absorb Amps is elevated. This is commonly caused when active loads are present.
Recommended End Absorption Amps
End Absorb Amps will vary based on your specific system. To set the correct End Absorb Amps it is recommended
that you monitor the amperage entering your battery banks near the end of the absorption cycle. Constant loads
will affect this number, and should be incorporated into End Absorb Amps if present. However, in a typical system
(without constant loads) it is recommended that the End Absorb Amps be 1% of your battery banks amp-hour
capacity (see Table F).
End Absorption Amps
The maximum amount of current that a battery bank can receive while in Absorption and still change to Float. If a
load is active and drawing more than the designated End Absorption Amps, the battery bank will not leave Absorption
until the maximum Absorption time is met. For a battery bank to move from Absorption to Float before the maximum
Absorption time is met, the minimum Absorption time must be met, and the amperage output must be less than or
equal to the designated End Absorb Amps.
Flooded
AGM
Gel
TPPL
Group
Size
Ah
1% End
Amps
Ah
1% End
Amps
Ah
1% End
Amps
Ah
1% End
Amps
24
75
0.8
79
0.8
73
0.7
76
0.8
27
90
0.9
92
0.9
86
0.9
91
0.9
31
105 1.1
105 1.1
97
1.0
102 1.0
4D
150 1.5
198 2.0
183 1.8
185 1.9
8D
200 2.0
245 2.5
225 2.3
228 2.3
Recommended Absorption Time
Minimum and Maximum Absorb Times can vary from installation to installation. It is recommended that Minimum and Maximum Absorption Times be based on the time it takes
a battery bank to reach End Absorb Amps. Read and understand the End Absorb Amps section above and set according to your system. After an accurate End Absorb Amperage
is set, monitor the minimum and maximum time it takes for each battery bank to reach their End Absorb Amps. The Minimum Absorb Time should be based on the minimum time
it takes a particular battery bank to reach End Absorb Amps. The Maximum Absorb Time should be an hour more than it takes a deeply discharged battery bank to reach End
Absorb Amps. It is recommended to monitor charging while the battery banks are in different states of discharge to get the most accurate Minimum and Maximum Absorb Times.
Table F:
Approximate End Absorb Amps
(1% of Ah Capacity)
Blue Sea Systems’ P12 Battery Chargers are designed and
tested to comply with California Energy Commission (CEC)
efficiency requirements and ship with these settings by default.
To disable this factory setting, select
Charger Setup Menu
,
select
Battery
and then press the
down
arrow and select
Set Absorb Timers
. Then press the
down
arrow four times
to view
General Charger Settings
screen. Press Select and use
the
left
or
right
arrow buttons to toggle between
ON
and
OFF
.
Complies with California Energy Commission (CEC)
efficiency requirements
Does not comply with California Energy Commission (CEC)
efficiency requirements
Energy Save Feature Control
P12
7531 AND 7532 BATTERY CHARGERS
