Studer VarioString User Manual page 33

progressively. Therefore, the VarioString does not work at the optimal point of the PV generator
because all the available PV power is not required.
8.4.5.5.1 Absorption phase allowed {14008} (yes)
This parameter determines whether the absorption phase is carried out or not. When this phase is
disabled, the charger goes directly to the following authorized phase (equalization, but most often
a floating phase).
8.4.5.5.2 Absorption voltage {14009} (57.6 Vdc)
Defines the applied voltage during absorption phase.
8.4.5.5.3 Force absorption phase {14010} (signal)
This signal starts again an absorption phase from the floating phase. The charge indicator (2) flashes
2x indicating that the equalization phase is on-going.
8.4.5.5.4 Absorption duration {14011} (120 min)
Use this parameter to set the absorption duration. The absorption phase starts once the set voltage
{14009} is reached. When the time is over (see chap. 7.2.2), the charger goes automatically to the
following authorized phase.
8.4.5.5.5 End of the absorption triggered by the current {14012} (no)
The absorption phase can be interrupted when the battery charging current goes under a certain
threshold, at which point the charger automatically passes to the next authorized phase. This can be
used in order to shorten the period under which a high voltage is applied and thus reduce water
consumption.
8.4.5.5.6 Current threshold to end absorption phase {14013} (10 Vdc)
Progressively, during the absorption phase, the charging current decreases naturally. If the bulk
phase has been carried out with a current appropriate for the battery, it is not necessary to wait for
a certain period to finish charging. The absorption phase can be interrupted if the battery charge
current falls below a certain level.
This parameter sets the current under which the absorption phase is considered finished. When the
charger current goes below this value, the next phase (most often the floating phase) starts. If the
production of the PV generator is insufficient to keep the voltage, this current is not taken into
account and the absorption phase goes on.
8.4.5.6 Equalization phase {14016}
Some types of battery need equalization in order to avoid the stratification of the water and acid
they contain. Use the parameters hereafter to set the operating conditions of this charging phase as
described in chap. 7.2.4.
During an equalization phase, an emission of a highly explosive gas occurs
(hydrogen/oxygen). Follow carefully all the instructions of the battery manufacturer
regarding this phase. In any case, make sure that the battery room is adequately
ventilated. Equalization reduces the battery water level: check it regularly.
8.4.5.6.1 Equalization allowed {14017} (no)
Determines whether the equalization phase (triggered manually or automatically) is allowed or not.
8.4.5.6.2 Force equalization {14018}
Use this parameter to manually start the equalization phase. It is only possible to force an equalization
phase when it is authorized by {14017}.
User manual V 1.0
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