Studer VarioString VS-120, Руководство пользователя

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VarioString
User manual V 2.3 19
In any case, the VarioString will limit the charging current (battery) to its rated current of 120A for the
VS-120 or 70A for the VS-70.
4.3.4 Safe use of the photovoltaic modules
The VarioString is meant for PV generators supplying up to 600V (900V in series). This voltage
is dangerous for human beings.
During the installation or the maintenance of the system, it is imperative to make sure that
no dangerous voltage may surge in the system. The disconnection device must be open
and secured against any accidental reclosing.
4.3.5 Protection devices
Wiring protection devices (fuses, circuit breakers) connecting the PV generator to the VarioString
must be installed in accordance with local standards and regulations in force.
The DIN VDE 0100-712 standard prescribes a switching device on all poles between the PV generator
and the charge regulator. This device must be supplied by the installer.
PV modules are often exposed to stormy weather. It is highly recommended to install lightning
protection (see chap. 4.5).
4.3.6 Cable cross-section and connection
The connection cable cross-section must be chosen according to the short-circuit current of the PV
generator and the local installation rules. PV connectors of Sunclix type do not need any special tools
for mounting. They accept cables between 2.5 and 6mm
2
(exterior of 5 to 8mm
2
). Strip the cable
15mm to attach the Sunclix connector.
4.3.7 Parallel connection of several VarioString
As many VarioStrings as necessary can be connected in parallel on the same battery bank
according to the battery capacity. Each will have its own independent solar generator (connected
in independent, parallel or series configuration) and include its own disconnection and protection
device to the battery.
Up to 15 VarioStrings can be synchronized and interconnected to the same communication bus (see
chap. 4.6) on a single system. Beyond these 15 units, any additional unit will not be interconnected
and thus their battery cycles will work independently.
Solar generators may be of various types and be orientated differently. Each VarioString will adjust
the optimum point of the PV generator independently of the other units connected to the same battery.
For multi-unit systems, the devices are connected to each other by a communication bus (see chap.
4.6) via the connectors (8) and a cable (ref. CAB-RJ45-8-2) with a maximum length of 5 meters.
As long as they are correctly connected together by the communication cable, the VarioString
automatically synchronize the battery charge cycle.
Under no circumstances should PV module inputs of several VarioString be put in parallel.
In multi-unit systems (connected to the same communication bus), all VarioStrings must be
connected to the same battery bank.
When the VarioString units are not synchronized, they must be programmed in the same
way and it is recommended to not activate the periodical equalization function. The
equalization can be started manually or will be done by the synchronized units.
When the devices are in the voltage regulation phase, their respective currents may
considerably differ. These differences have no effect at all on the charge quality.