Studer VarioString User Manual page 24

Studer Innotec SA
VarioString
Pos. n°1 Function
OFF DIP switches not taken into account. Default parameters, or those set by the remote
control RCC-02/03 are active.
ON DIP switches are taken into account if authorized by {14174}
DIP switches no. 2, 3 and 4 allow the battery cycle to be modified as per the table below in order to
adapt it to the various types of most common lead-acid batteries. The following values are for a 48V
system.
Pos n°
2 3 4
OFF OFF OFF
ON OFF OFF
OFF ON OFF
ON ON OFF
OFF OFF ON
ON OFF ON
OFF ON ON
ON ON ON
If a VarioString is interconnected (communication) to an Xtender inverter/charger, the
VarioString battery cycle will be automatically synchronized with the cycle of the Xtender in
the system. This function may be disabled by parameter {14036}.
When several VarioStrings are interconnected (communication) and linked to the same
battery, differences in production (power) are normal, especially in the following cases:
 The units are in voltage regulation phase (absorption, equalization, floating), and in
this case the current distribution may be very uneven. This situation is normal and
has no influence on the system efficiency.
 The equipment is in a bulk phase; in this case the difference is due to the
difference in size, orientation, cleanness, shade or any other situation that may
influence the production capacity of the solar generator. This situation may require
the generator to be checked in order to clear/remedy the possible fault.
DIP switches 7 and 8 allow the definition of the topology of the PV module connections, which can
be done in 3 different ways on the VarioString: independent (each string of PV modules connected
to one VarioString PV input), in series or in parallel. With the automatic position, the VarioString will
determine itself the connection topology. In this case, the VarioString will perform a cabling test when
it detects a voltage at both the PV inputs. Or, if a voltage at only 1 PV input is detected, the test
begins after 15 minutes. The automatic detection requires a certain power level to be available. In
the case of system commissioning at night or with a very low insolation, the test will be postponed
until the necessary conditions are present.
Pos n° Connection mode of the
7 8
OFF OFF Automatic
ON OFF MPPTs independents
OFF ON MPPTs in series
ON ON MPPTs in parallel
24
Battery type
Open 54.4V
Sealed w/short abs. 54.4V
GEL 55.2V
AGM 53.6V
Sealed w/o abs. 54.4V
Open + 54.4V
equalization
Open + manual 54.4V
equalization
Open - reduced 53.6V
voltage
MPPT inputs
Floating Absorption
voltage voltage/period
57.6V / 2h
57.6V / 1h
56.8 / 2h
57.2V / 2h
No
57.6V / 2h
57.6V / 2h
57.2V / 2h
V 1.0
Equalization (30min)
No
No
No
No
No
63.2 V - 1/ 20 days +
manual
63.2 V + manual
63.2 V - 1/ 20 days +
manual
User manual