Studer VarioString VS-70 User Manual
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Studer VarioString VS-70 User Manual

Mppt solar charge controller
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VarioString
MPPT solar charge controller
User manual
VarioString
VS - 120
48V- 120A
Accessories:
Remote control........................................... RCC-02/03
Temperature sensor...................................... BTS-01
External auxiliary relay module...................... ARM-02
Studer Innotec SA 2018
4O9P
VarioString
VS -70
48V- 70A
V 2.3

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Questions and answers

Mei Mei
May 6, 2025

What is expected if the watchdog (Nr 14218) is set to enabled on VarioString-70 by external inverter via CAN comms?

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Summary of Contents for Studer VarioString VS-70

  • Page 1 VarioString MPPT solar charge controller User manual VarioString VarioString VS - 120 VS -70 48V- 120A 48V- 70A Accessories: Remote control……………………………………. RCC-02/03 Temperature sensor…..…………………………. BTS-01 External auxiliary relay module...………………. ARM-02 Studer Innotec SA 2018 V 2.3 4O9P...
  • Page 2 Studer Innotec SA VarioString V 2.3 User manual...

  • Page 3: Table Of Contents

    Unpacking ............................. 8 Mounting place............................ 9 Fixing/Dimensions ..........................9 3.4.1 VarioString VS-120........................9 3.4.2 VarioString VS-70 ........................10 3.4.3 Assembling the cooling fan ECF-01 ..................10 WIRING ..............................11 Elements of the cable compartment .................... 11 4.1.1 VarioString VS-70 ........................12 4.1.2...
  • Page 4 VarioString + RCC-02 ......................... 50 12.2 Comments on the wiring examples 12.1 ..................50 12.3 VarioString VS-70 + RCC-02 ......................51 12.4 Comments on the wiring examples 11.3 ..................51 MAINTENANCE OF THE INSTALLATION ....................52 PRODUCT RECYCLING ......................... 52 EU DECLARATION OF CONFORMITY ....................

  • Page 5: Introduction

    The VarioString operates as an independent device but is also designed to be included into a Studer energy system together with the Xtender inverters/chargers, the BSP battery monitor, the control, display and programming unit RCC-02/03 and all Xcom communication modules.

  • Page 6: Important Safety Instructions

    Studer Innotec SA VarioString 2.2 I MPORTANT SAFETY INSTRUCTIONS This manual contains important safety instructions. Read carefully the safety and operation instructions before using the VarioString. Take into consideration all warnings mentioned both on the equipment and in this manual, strictly following all instructions regarding its operation and use.

  • Page 7: Quality And Warranty

    Studer Innotec reserves the right to make any modifications to the product without prior notification. Studer Innotec is not liable for incidental, direct or indirect damages of any kind, including any profit loss, revenue loss or damages caused to equipment or goods due to defective equipment.

  • Page 8: Warnings And Guidelines

    5 minutes in order to allow the electronics to discharge. The task can then be carried out safely. No person is authorized to proceed with any change, modification or repair of the equipment without prior written authorisation from Studer Innotec. Only original parts should be used in authorised modifications or replacements.

  • Page 9: Mounting Place

    Studer Innotec SA VarioString 3.3 M OUNTING PLACE The mounting place for the VarioString is particularly important and must fulfil the following criteria:  Indoors  Protected from water and dust in a location without condensation.  Protected from any unauthorized person.

  • Page 10: Variostring Vs-70

    3.4.3 Assembling the cooling fan ECF-01 The VarioString VS-70 is supplied with an external cooling fan module (ECF-01). This module can be installed before or after mounting the VarioString VS-70, on the wall.

  • Page 11: Wiring

    Socket for communication cables and of the Xtender family. These connections must be the remote control RCC-02/03. carried out only with original Studer cables. The switch must be placed in position O (towards Termination switch (8)) when both connectors are used.

  • Page 12: Variostring Vs-70

    See sect. 8 – p. 27 in fig. 4.1.1 and 4.1.2. By default, entry they are positioned at A-1/2 and B-2/3. VS-70 : Fuse 100A/80V (sect. 4.2.2.2) Battery protection fuse VS-120 : Fuse CF8/150A/58V (sect. 4.2.2.1) 4.1.1 VarioString VS-70 V 2.3 User manual...

  • Page 13: Variostring Vs-120

    Studer Innotec SA VarioString 4.1.2 VarioString VS-120 User manual V 2.3...

  • Page 14: Connecting The Battery

    Studer Innotec SA VarioString 4.2 C ONNECTING THE BATTERY The VarioString is a device which DC (battery) connection is to be connected exclusively to a battery. Most of the time, lead-acid batteries with liquid (VLA, VRLA) or gelled (GEL) and AGM electrolyte may be used.

  • Page 15: Connecting The Battery

    Studer Innotec SA VarioString A battery voltage higher than 75V can cause important damage or destroy the equipment. Such voltage applied equipment connected downstream like Xtender inverters/chargers or other, can cause important damage or destroy the equipment! 4.2.2 Connecting the battery All connection cables as well as the battery cables must be mounted using cable restraints in order to avoid any pulling on the connection.

  • Page 16: Photovoltaic Generator (Pv)

    Studer Innotec SA VarioString 4.3 P (PV) HOTOVOLTAIC GENERATOR The VarioString may accept the following maximum input voltages:  600 V max for independent and parallel cabling VS-120  900 V max for series cabling VS-70  600V The whole solar system must be installed according to protection class II.

  • Page 17: Serial Connection (Chain Or String) Of Pv Modules

    Studer Innotec SA VarioString The VS-120 possible operating range within different configurations are indicated in the graph below (blue (A): one independent input, red (B): two inputs in parallel, green (C): two inputs in series). 4.3.2 Serial connection (chain or string) of PV modules To get the optimum voltage, connect the PV modules in series to form a string with the desired voltage.

  • Page 18: Parallel Connection Of Pv Module Strings

    Studer Innotec SA VarioString 36 cell 60 cell 72 cell Thin film module module module module Voc < 25V Voc < 42V Voc < 50V Voc < 110V max. max. max. VS-70 VS-120 with independent or parallel inputs For VS-120 with two inputs in series Beware of the PV module temperature! The above values are for modules under standard test condition (STC).

  • Page 19: Safe Use Of The Photovoltaic Modules

    Studer Innotec SA VarioString 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.

  • Page 20: Extension Of An Existing Installation

    Studer Innotec SA VarioString If a VarioString is connected to another compatible device (Xtender, VarioTrack, VarioString, BSP, RCC, Xcom) with the same communication bus, it is highly recommended to make a software update of all components in the system in order to guarantee all functionalities.

  • Page 21: Lightning Protection

    VarioStrings or to other equipment such as the RCC, the BSP or the Xcom having the proprietary protocol of Studer Innotec. In this case, the installation should be stopped and de-energized (the protection devices of power sources and loads should be open) to complete the cable connection and positioning of the termination switches of all the devices connected to the communication bus.

  • Page 22: Power-Up Of The Equipment

    Studer Innotec SA VarioString POWER-UP OF THE EQUIPMENT It is imperative that the closing cover for the connection compartment is installed and screwed tight before energizing the installation. There are dangerous voltages inside the cable compartment. If special configurations or settings are required for the system and they are set via internal buttons or switches (DIP switch, see chap.

  • Page 23: Display System

    Studer Innotec SA VarioString DISPLAY SYSTEM The VarioString is fitted with a “Set” button and light indicators on the front of the equipment allowing a clear identification of the operating mode. 6.1 T “SET” BUTTON The “Set” button can be used to start an equalization cycle manually if this phase is authorized by the initial settings of the equipment.

  • Page 24: Error" Indicator (3)

    Studer Innotec SA VarioString 6.4 “E ” RROR INDICATOR The table below describes the type of error according to the number of times this indicator blinks red. Indic. Indicated error Comment No problem If no indicator lights up, the equipment is de-energized.

  • Page 25: Battery Charging Process

    Studer Innotec SA VarioString BATTERY CHARGING PROCESS 7.1 G ENERAL POINTS The VarioString has many parameters that can be modified by the user or the installer in order to adapt the equipment to the energy system the best possible way. The factory values of these parameters are reported in the table at the end of this manual (see chap.16).

  • Page 26: Temperature Compensation

    Studer Innotec SA VarioString When this phase is authorized, it can be started manually by pressing for 2 seconds the “SET” button on the front of the VarioString. The countdown for the equalization time starts as soon as the equalization voltage {14021} is reached and lasts as long as the battery voltage is higher than the absorption voltage {14009}.

  • Page 27: Remote Entry (Available As From Software Version 1.5.22)

    Studer Innotec SA VarioString REMOTE ENTRY (AVAILABLE AS FROM SOFTWARE VERSION 1.5.22) The VarioString has one remote entry that can be assigned to a function and programmed with the remote control RCC-02/-03. By default, no function is defined for the remote entry.
  • Page 28 Studer Innotec SA VarioString Priority of DIP switch The DIP switch parameter settings are prioritized over the parameter settings of the RCC. Therefore, if the parameter {14174} authorizes the use of the DIP switch and the position 1 of the DIP switch is activated (in ON position), the DIP switch will have priority over the parameter settings in the RCC.

  • Page 29: Displaying The Equipment Status Using The Remote Control Rcc-02/03

    Studer Innotec SA VarioString DIP switches 5 and 6, reserved. For the VS-120 the 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 VS-120: independent (each string of PV modules connected to one VarioString PV input), in series or in parallel.
  • Page 30 Studer Innotec SA VarioString When no other value than the one initially displayed in the field is selected, ESC key validates the initial choice. The four fields can be scrolled and modified any time to display four of the values indicated in the table below.

  • Page 31: Displaying The Operating Mode Of The Equipment (Info N° 15013,15014,15015)

    Studer Innotec SA VarioString Info. no. Name Unit Description 15042 Tabs Time in absorption of the current day Type of error (None, OverV_B, OverV_PV, OverV_PV1, OverV_PV2, OverI_PV, OverI_PV1, OverI_PV2, GroundBat, 15049* Text GroundPV, GroundPV1, GroundPV2, OverTemp, UnderV_B, Cabling, Other) 15050...

  • Page 32: Displaying Security Errors (Info N° 15049)

    Studer Innotec SA VarioString 9.2.3 Displaying security errors (Info n° 15049) When a security error occurs, the device will stop functioning. A short text, limited to 8 characters, will appear on the display indicating which kind of error it is.

  • Page 33: Configuring The Variostring Using The Remote Control Rcc-02/03

    Therefore, before starting the setup of the device, download the latest software version from our website: www.studer-innotec.com on an SD card. Follow the instructions in the RCC manual for a successful installation.

  • Page 34: Parameter Access Level

    Studer Innotec SA VarioString 9.4.2 Parameter access level All described parameters are accessible through 2 different access levels, "Basic" and "Expert". When using the factory configuration, only a few parameters are accessible at "Basic" level. To access the other menus and parameters, the RCC's configuration must be set to “Expert” level. How to change the user level is indicated in the RCC user manual, chapter "User level".
  • Page 35 Studer Innotec SA VarioString User ref. Level Parameter Factory value Expert 14037 SYSTEM Expert 14174 Block manual programming (dip-switch) Expert 14040 Type of battery grounding No control Expert 14194 Configuration for VS-120 Expert 14041 Type of PV grounding No control...

  • Page 36: Basic Settings {14000

    Synchronisation battery cycle with Xtender {14036} (yes) When a Studer inverter of the range Xtender is used in the system, it can transfer to the VarioTrack its battery charge setting so that they can operate together in an optimum way. Synchronization allows V 2.3...
  • Page 37 Studer Innotec SA VarioString a coherent operation of multiple units which participate to the battery charging and avoids multiple successive equalizations triggered by each charger. When this parameter {14036} is activated, all other parameter involved in the battery cycle are hidden and not accessible. In this case, only the maximum charging current is adjustable.
  • Page 38 Studer Innotec SA VarioString 9.4.5.7.5 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.
  • Page 39 Studer Innotec SA VarioString 9.4.5.8.6 Equalization with fixed interval {14023} (yes) When this parameter is activated (yes), the battery charge cycle with an active equalization phase starts at the interval specified by the following parameter {14024}. 9.4.5.8.7 Days between equalizations {14024} (26 days) This parameter determines the number of days in between the equalizations.

  • Page 40: System {14037

    Studer Innotec SA VarioString 9.4.5.9.2 Conditions for a new cycle A new battery cycle will be triggered if one or the other 2 conditions, defined by a period of time during which the battery voltage is lower than a threshold, is met. These 2 voltages related to 2 durations are configurable.
  • Page 41 Studer Innotec SA VarioString measured open circuit voltage is multiplied by this ratio to calculate the operating point. (ex.: the measured open circuit voltage is 500V, Ratio 0.7, the operating point will be 500x0.7=350V). Upv fixed: with this mode the VarioString fixes the PV operating voltage and it does not vary.

  • Page 42: Auxiliary Contacts 1 {14070} And 2 {14122

    Studer Innotec SA VarioString 9.4.6.7.2 ON/OFF command {14202} When this parameter is activated, an active remote entry turns on the VS and an inactive remote entry turns off the VS. When this parameter is activated it has priority over others and deactivates the button ON/OFF on the display and the ON/OFF on the RCC-02/-03.
  • Page 43 Studer Innotec SA VarioString The programming of each contact made independently. The auxiliary contacts are activated and deactivated with a 2 second delay to avoid too frequent switching. The auxiliary contacts react to different types signals, graphically illustrated below. {14071}...
  • Page 44 Studer Innotec SA VarioString 9.4.7.5 Contacts activated by an event {14077} {14129} Different states and events within the installation can be used to activate the auxiliary contacts. The events can be combined with each other to create complex functions. 9.4.7.5.1 VarioString is ON {14188} {14189} (no) The contact is activated if the VarioString is switched ON.
  • Page 45 Studer Innotec SA VarioString The contact can also be deactivated when the battery has reached the floating phase.  Battery voltage 1 activated {14091} {14143} (no)  Battery voltage 1 {14092} {14144} (46.8 Vdc)  Delay 1 {14093} {14145} (1 min) ...

  • Page 46: Accessories

    Therefore, before starting the setup of the device, download the latest software version from our website: www.studer-innotec.com on an SD card. Follow the instructions in the RCC manual for a successful installation.

  • Page 47: Temperature Sensor Bts-01

    The RCC-02 is designed for wall mounting whereas the RCC-03 is designed for board mounting. Model RCC-03 must be removed from the board to access the SD card slot (during updating, for example). Reference number Studer Innotec Dimensions H x L x l [mm] RCC-02 170 x 168 x 43.5 RCC-03 130 x 120 x 42.2...

  • Page 48: Auxiliary Relay Module Arm-02

    Studer Innotec SA VarioString 10.3 A ARM-02 UXILIARY RELAY MODULE This external module is mounted on DIN rail and connected to the same connector as the battery temperature sensor (7) by using a 5m cable supplied with the accessory. If the connector (7) is already occupied by the battery temperature sensor BTS, unplug the temperature, plug in the ARM module in its place and connect the battery temperature sensor to the ARM module.

  • Page 49: Communication Module Xcom-232I

    OMMUNICATION MODULE The communication module Xcom-SMS makes it possible to access systems with Studer Innotec devices through SMS (Short Message Service) sent from a mobile phone, a web site, etc. It provides the user with a tool that gives easy access to the system in order to know its current state and to control it remotely reducing the necessity to physically go to the site.

  • Page 50: Wiring Examples

    Studer Innotec SA VarioString 12 WIRING EXAMPLES 12.1 V + RCC-02 ARIO TRING 12.2 C 12.1 OMMENTS ON THE WIRING EXAMPLES Elem. Description Refer to Remote control See chap. 10.1, 9.2 Battery See chap. 4.2 Lightning protection device See chap. 4.5 Communication cable See chap.

  • Page 51: Variostring Vs-70 + Rcc-02

    Studer Innotec SA VarioString 12.3 V VS-70 + RCC-02 ARIO TRING 12.4 C 11.3 OMMENTS ON THE WIRING EXAMPLES Elem. Description Refer to Remote control See chap. 10.1, 9.2 Battery See chap. 4.2 Lightning protection device See chap. 4.5 Communication cable See chap.

  • Page 52: Maintenance Of The Installation

    Studer Innotec SA VarioString 13 MAINTENANCE OF THE INSTALLATION Except for the periodic check of the connections (tightening, general condition) the VarioString does not require any particular maintenance. 14 PRODUCT RECYCLING The VarioString meets the European directive 2011/65/EU on hazardous substances and does not contain the following elements: lead, cadmium, mercury, hexavalent chrome, PBB or PBDE.

  • Page 53: Trouble-Shooting

    Studer Innotec SA VarioString 16 TROUBLE-SHOOTING User Description Troubleshoot ref. Warning (000): Battery low The battery voltage has fallen below the battery undervoltage level {14216}. The device will not turn off. (012): Use of battery temperature sensor Indicates the presence of a BTS-01 temperature probe connected to the device that sent the message.

  • Page 54: Parameter List

    Studer Innotec SA VarioString 17 PARAMETER LIST User User Level ref. Parameter Factory value value Expert 14001 Battery charge current (VS-120) 120 Adc Basic 14002 Configuration of PV modules (VS-120) Automatic Expert 14005 Floating voltage 54.4 Vdc Expert 14006 Force phase of floating...
  • Page 55 Studer Innotec SA VarioString User User Level ref. Parameter Factory value value Combination of the events for the auxiliary contact Expert 14072 Any (Function OR) (AUX 1) Expert 14074 Activated in night mode (AUX 1) Expert 14075 Delay of activation after entering night mode (AUX 1)
  • Page 56 Studer Innotec SA VarioString User User Level ref. Parameter Factory value value Combination of the events for the auxiliary contact Expert 14124 Any (Function OR) (AUX 2) Expert 14126 Activated in night mode (AUX 2) Expert 14127 Delay of activation after entering night mode (AUX 2)
  • Page 57 Studer Innotec SA VarioString User User Level ref. Parameter Factory value value Expert 14175 Type of PV1 grounding No control Expert 14176 Type of MPP tracking algorithm PV1 Expert 14177 PV1 voltage fixed 500 Vdc Expert 14178 Ratio of PV1 open circuit voltage...

  • Page 58: Technical Data

    Studer Innotec SA VarioString 18 TECHNICAL DATA 18.1 G ENERAL SPECIFICATIONS VarioString VarioString VS-70 VS-120 Galvanic isolation Maximum conversion efficiency > 98% MPPT efficiency >99% PV grounding possibility PV +, PV -, floating Consumption max en stand-by 25 mA (1.25W)

  • Page 59: Environment

    Studer Innotec SA VarioString 18.4 E NVIRONMENT VarioString VarioString VS-70 VS-120 Operating ambient temperature range -20°C to 55°C Relative moisture Max 95%, without condensation Degree of protection IP54 IP20 Mounting location Indoors, pollution degree 2 18.5 P ROTECTION VarioString VarioString...

  • Page 60: Index Of Parameters

    Studer Innotec SA VarioString 19 INDEX OF PARAMETERS {14000} ........36 {14080} ........44 {14142} ........44 {14001} ....25, 31, 36, 37, 38 {14081} ........44 {14143} ........45 {14002} ........36 {14082} ........44 {14144} ........45 {14003} ........36 {14083} ........
  • Page 61 Studer Innotec SA VarioString User manual V 2.3...
  • Page 62 Studer Innotec SA VarioString V 2.3 User manual...
  • Page 63 Studer Innotec SA VarioString User manual V 2.3...
  • Page 64 Studer Innotec SA Rue des Casernes 57 1950 Sion – Switzerland Tel: +41(0) 27 205 60 80 Fax: +41(0) 27 205 60 88 info@studer-innotec.com www.studer-innotec.com...

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