PIKA B801 REcharge, Руководство по эксплуатации, Страница: 20 / 35

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Depth of Discharge (DoD)
The state of charge of the batteries can be 0% to 100% charged. The Depth of Discharge refers to how
much of the total charge you want to use before charging the battery bank back to 100% charge again.
For example a 40% DoD would mean that when the batteries got down to 60% state of charge then the
B801 would start to Bulk charge the batteries back to 100% state of charge (see Bulk charging section for
more information on Bulk charging). In order to get the most out of your batteries every charge cycle
you want to discharge them as much as possible.
However , the lifetime of the batteries decreases as
the DoD gets larger. Research your battery model specifications and assess your energy production and
usage to make the choice that’s ri ght for you.
7.4.2 Bulk
Bulk charging occurs when the batteries are between the desired DoD and fully charged. During this
stage the battery voltage rises to the
” Bulk Voltage ” and the battery bank voltage is held at the “Bulk
Voltage” for a set amount of time. After the voltage is held at the “Bulk Voltage” for the set amount of
time the B801 enters the Absorption charge stage.
7.4.3 Absorption
As the batteries near a complete charge, less and less current is required to maintain the same “Bulk
Voltage ”. Absorption charging maintains the same “Bulk Voltage” as the bulk charging state while
tapering down the amount of current into the batteries. After an allotted time has elapsed the current
will have decreased significantly and charging will then enter Float charging stage, at this point the
batteries are near a 100% charge.
7.4.4 Float
Float charging starts when the battery is close to a full charge, the B801 attempts to apply a constant
float voltage, maintaining a near 100% charge. If the battery loads are consuming more power than the
input power coming from the
REbus™ DC Microgrid, then the battery voltage will decrease. When the
battery volt age reaches the user defined “Re - bulk” voltage, the B801 will enter Bulk charging mode
again. The B801 will always cycle through the three charging states: Bulk, Absorption and Float.
7.4.5 Equalize
After the battery bank experiences repeated charging cycles the individual cells that make up each
battery become unbalanced, and some hold more charge then others. In order to maximize the lifetime
and total energy storage of your battery bank you must
“ Equalize ” the battery bank. Equalization brings
all of the individual cells within a battery to the same voltage. This is done by holding the battery bank
at a
slightly higher voltage then the “Bulk Voltage”. This does no t harm the batteries in any way and it is
part of typical battery maintenance. Equalization is initiated manually by the user and stops after the
equalization time has elapsed. It is recommended to perform equalization periodically and during a
time with steady input power. Please check with the battery manufacturer about maintenance and
equalization best practices.