Temperature Parameters - Blue Sea Systems 7531 User Manual

Absorption Parameters and Timers
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.
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.
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).
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 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.
Energy Save Feature Control
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
Complies with California Energy Commission (CEC)
and OFF.
efficiency requirements
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Specifications are subject to change. See bluesea.com/P12 for current information.
P12
7531 AND 7532 BATTE RY C HAR GER S
Table F: Approximate End Absorb Amps
(1% of Ah Capacity)
Flooded AGM Gel TPPL
Group 1% End 1% End 1% End 1% End
Ah Ah Ah Ah
Size Amps Amps Amps 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
Does not comply with California Energy Commission (CEC)
efficiency requirements
Absorption Parameters and Timers
Absorption Timer Counter
The P12 battery charger uses a counter to determine the amount of time a battery bank should remain in Absorb relative to the Maximum Absorb Time. The Absorb timers counter
can be seen in the System Status Screen and also referenced on page 19.
Available Timer Modes
When in Float or Standby, the timer will pause.
When in Pre-Float mode the timer for that channel will pause.
When in Bulk mode the remaining time will increase.
When in Absorption mode, the remaining time will decrease.
Once a battery bank's Absorb timer is reduced to zero, then its output will be changed to Pre-Float. There are
other factors in a battery bank leaving the Absorption stage prior to the Absorb timer running out. Once all battery
banks leave Absorption, all outputs will enter the Float stage, or Rest stage if in Energy Save mode.

Temperature Parameters

WARNING
Altering the default temperature parameters could cause serious property or personal damage. Contact your battery manufacturer to clarify the correct
temperature parameters for your specific batteries.
NOTE: Temperature parameters refer to the temperature measured at the temperature sensor, not the temperature of the charger. In this manual all temperatures
will be referenced in degrees in Celsius (°C). The user selectable range for battery temperature parameters is -20°C to 60°C. Ensure proper placement of battery
temperature sensor by referencing Step 8 on page 10
Minimum Charge Temperature: The default is 0ºC
The lowest temperature of the sensor in which the charger will continue charging. If the temperature sensor measures below the minimum charge temperature, the charger will
enter standby mode, and cease to charge.
CAUTION
Charging batteries below 0°C can be potentially dangerous. Internal battery liquid can freeze and charging a frozen battery could cause serious property or
personal damage. Contact your battery manufacturer for minimum safe charging temperature for your batteries before altering.
Maximum Charge Temperature: The default is 50ºC
The highest temperature of the sensor in which the charger will continue charging. If the temperature sensor measures above the maximum charge temperature, the charger will
enter standby mode, and cease to charge.
CAUTION
Charging batteries above 50°C can be potentially dangerous. Contact your battery manufacturer for the maximum safe charging temperature for your
batteries before altering.
Battery Temperature Compensation (Tempco)
Battery temperature compensation is output voltage regulation based on battery temperature variances. Since batteries can see extreme temperature differences it is important
to regulate output voltage with temperature. A battery in a freezing environment should not be charged the same as a battery in a hot environment. The P12 Battery Charger
is set at a baseline of 25°C. Every degree variance from this baseline will result in a voltage variance on all outputs. For every degree above 25°C the charger will reduce all
output voltages by the value defined in Battery Tempco. For every degree below 25°C the charger will increase all output voltages by the value defined in Battery Tempco. For
example, with the default Battery Tempco set to -30mv/°C if the temperature sensor reads 26°C, then all output voltages will be reduced by .03V (30mv). If given the same
Battery Tempco and the temperature sensor reads 24°C, then all output voltages will be increased by .03V (30mv).
CAUTION
Altering the battery temperature compensation value incorrectly can cause adverse effects on
your battery, by potentially reducing its life. Contact your battery manufacturer to find out the
specific temperature compensation parameters for your batteries.
P12
(continued)
7531 AND 7532 BATTERY CHARGERS
Specifications are subject to change. See bluesea.com/P12 for current information.
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