MANUAL

String-Box 08

String-Box 12

MANUAL

String-Box 08

String-Box 12

The Sunways String Box is a generator connection box and serves as a terminal unit for

the individual string cables in PV systems.

The Sunways String Box offers the following benefits:

• Protection of the DC string main cables through string fuses (string fuses must be

ordered separately depending on the module type. Fuses can be installed at the

positive pole and the negative pole)

• Optional protection for the inverter and PV module array (DC side) against overvoltage

interference via solar connector cables (if the model with overvoltage protection is used)

• Optional DC load break switch between inverter and module array (required according

to IEC 60364-7-712)

The Sunways String Box is manufactured according to VDE 0100 and IEC 60364-7-712

and meets the requirements of protection class II. Maximum system safety is achieved

through consistent spatial separation of positive and negative poles, dual insulation of

the string cables and appropriate air and creepage distances.

For measuring purposes the positive and negative poles can be isolated to facilitate

system checks. All units feature robust and weather-resistant polycarbonate housings

that are suitable for indoor or outdoor installation with appropriate protection from the

elements.

Proper use

Functions

• All string cables are routed into the string boxes. The string fuses protect the DC cable

and the module from excessive short-circuit currents.

• An optional disconnection point can be provided in the solar system for maintenance

purposes.

• A cable with adequate cross-section must be used for the overvoltage protection facil-

ity (min. 16 mm2 depending on the cable length). Overvoltage protection can be inte-

grated into the monitoring system through the voltageless remote signalling contacts.

• Output cables with cross-sections up to 35 mm2 (fine-strand) or 50 mm2 (multi-strand)

can be used. In the version with integrated DC load break switch cables with cross-

sections up to 95 mm2 can be connected.

The Sunways String Box is available with the following options:

String Boxes

Art. No. Description

SE100E10A String-Box 08 Basic

SE101E10A String-Box 08 incl. overvoltage protection

SE102E10A String-Box 08 incl. overvoltage protection and DC switch

SE103E10A String-Box 12 Basic

SE104E10A String-Box 12 incl. overvoltage protection

SE105E10A String-Box 12 incl. overvoltage protection and DC switch

PV fuses 10x38 mm (set of 10)

Art. No. Description

SE106E10A 8 A, 1000 V (for modules with 5“ cell)

SE107E10A 12 A, 1000 V (for modules with 6“ cell)

SE108E10A 16 A, 1000 V

PV sleeves 10x38 mm (set of 10)

Art. No. Description

SE109E10A (as fuse substitute at the negative pole)

Product overview

Operating principle

Delivery scope

- String Box

- DIN fittings

- Quick reference guide for installation and connection

Safety instructions

- The installation must be carried out by qualified personnel according to the

specified standards and guidelines.

- Any damage to the casing must be rectified as soon as possible in order to prevent

ingress of moisture and contaminants and risk of electric shock.

- Generally applicable safety instructions and regulations can be found in the

following standards:

DIN VDE 0100-712 Solar photovoltaic (PV) power supply systems

(Requirements for special installations or locations)

VDI 6012 VDI Guideline: Local energy systems in buildings - Photovoltaics

BGV A1/A2 Safety Regulations of Employer‘s Liability Insurance Association;

Electrical Systems and Operating Equipment

IEC 62548 Installation and safety requirements for photovoltaic (PV)

IEC82/514/CD generators

Caution! Dangerous DC voltages are present in the generator connection

box. Even after the DC load break switch has been disconnected

voltages up to 1,000 VDC are still present at all terminals

(capacitor charge of the inverter and voltage in the module array).

Installation

IP65

Installation location

During installation please ensure that:

- the mounting surface is as level as possible, in order to prevent distortion of the

casing during fastening screw and subsequent leaks;

- the String Box is fitted such that it is easily accessible in order to actuate the

DC load break switch;

- the String Box is not directly subjected to the elements, in order to prevent

premature aging of the casing and overheating of the internal components.

(max. ambient temperature ta = 40°C )

Cable entry

- Use the enclosed DIN fittings for the cable entry.

- Fasten the cable glands properly.

- Fit the enclosed rubber seals to the DIN fittings in order to prevent ingress of

moisture and dust.

IP65

Installation examples for tracking

systems or frame-mounted systems.

Rubber seal

To connect the String Box proceed as follows:

1. Disconnect the DC load break switch at the String Box (position 0).

If your box does not have a load break switch,

use the switch in or on the inverter.

2. Open the fuse holder and remove the fuses. Always disconnect the DC load break

switch before opening the fuse holder.

3. Connect the strings directly to the fuse holders via screw terminals.

4. Measure the polarity and voltage of the connected strings

(open fuse holder, without fuse)

Electrical connection of the String Box

Caution: Failure to observe the polarity and voltage at the individual strings

can lead to arching when the fuse holder is opened and closed with the fuse

inserted. Fire hazard!

Connect the DC main cables to the inverter. Depending on the cable shoes used,

cables with up to 95 mm2 cross-section can be connected to the String Box.

Some String Box versions feature surge protectors. If the surge protector was trig-

gered the fault is displayed at the varistor or indicated via the potential-free contact.

The earth lead should have a minimum cross-section of 16mm2 and be connected

along the shortest route to the equipotential bonding designated for the PV system.

Important: In order to ensure the correct function of the surge protector on the

AC and DC, the whole system must be operated with the same equipotential

bonding (earth strip or rod).

5. Once all cables have been installed and connected properly, the system check can

commence. Please enter the measured values in the test protocol on the last page.

For the measurement proceed as follows:

a) Open the fuse holder in de-energised

state.

b) Remove the fuses.

c) Set the measuring device to DC

voltage measurement.

d) Measure the individual strings.

e) Enter the measured values in the log

f) Important! The values should be

within the range +/- 10 V.

FM-Kontakt

6. Once all strings have been measured and recorded, the fuses can be inserted and

closed.

7. Before closing the DC load break switch please familiarise yourself with the

commissioning guide for the inverter. If all conditions for safe connection of the

DC voltage are met, the switch can be actuated.

8. Finally please ensure that all covers are closed properly, in order to prevent ingress

of moisture and dust.

9. The String Box is supplied with metal sleeves in the negative pole fuse holders as

standard. These can be replaced with fuses. No additional fuse sleeves must be

used at the positive pole.

INPUT INPUT

OUTPUT

String Box 08 with overvoltage protection

String Box 08 with overvoltage protection and DC load break switch

Input

No. of inputs String-Box 08: 8 x plus, 8 x minus

String-Box 12: 12 x plus, 12 x minus

Max. DC voltage/terminal 1000 V

Max. DC current/terminal 8,5 A

DIN fitting M16

Screw terminals max. max. 10 mm²

Fuse socket 10 x 38 mm

Output

No. of outputs 1 x plus, 1 x minus

Max. DC voltage 1,000 V

Max. DC current 75 A

DIN fitting M25

Screw terminals max. 35 mm2 fine-strand / 50 mm2 multi-strand

DC load break switch (optional)

Max. open-circuit voltage (VDC) 1,000 V

Max. DC current (ADC) 80 A

Isolator unit Socomec Sirco 125 A 4-pin, external actuation

Output terminals Cable socket M8 at switch

Cable entry DIN fittings

Overvoltage protection (optional)

Category Class II / “C“

Type Phoenix VAL MS1000 DC

Housing

Design Protection Class II / P65, polycarbonate

Dimensions (without DC load break sw.) String-Box 08: 380 x 280 x 130 mm (W x H x D)

String-Box 12: 558 x 280 x 130 mm (W x H x D)

Dimensions (with DC load break sw.) String-Box 08: 660 x 320 x 179 mm (W x H x D)

String-Box 12: 860 x 320 x 179 mm (W x H x D)

Ambient temperature 40°C

Other features Pressure compensation element to prevent

condensation

Technical Data

String measurements

ModulesManufacturer

Model

Nominal output Wp

Open-circuit voltage V (U0C)

Nominal voltage V (Umpp)

Nominal current A (Impp)

Short-circuit current A (Isc)

Temp. coeff. (Uoc) %/K / mV/K

Strings

No.

Modules in series

Fuse protection A

Cable cross-section mm2

Inverter

Manufacturer

Model

Nominal output kW ACp

AC Spannung V

max. DC output kWp DC

max. DC current A DC

max. open-circuit voltage V DC

MPP control range V

System location

Name

Additional name

Street

Post Code, Town/City

Contact

Installers

Company

Name

Additional name

Street

Post Code, Town/City

Phone

Fax

E-Mail

Date

Client

signature

String measurementsInput U0C (VDC) Input U0C (VDC) String 1 String 36

String 2 String 37

String 3 String 38

String 4 String 39

String 5 String 40

String 6 String 41

String 7 String 42

String 8 String 43

String 9 String 44

String 10 String 45

String 11 String 46

String 12 String 47

String 13 String 48

String 14 String 49

String 15 String 50

String 16 String 51

String 17 String 52

String 18 String 53

String 19 String 54

String 20 String 55

String 21 String 56

String 22 String 57

String 23 String 58

String 24 String 59

String 25 String 60

String 26 String 61

String 27 String 62

String 28 String 63

String 29 String 64

String 30 String 65

String 31 String 66

String 32 String 67

String 33 String 68

String 34 String 69

String 35 String 70

Commissioned

Date

Company

Installer

Installer

signature

Sunways AG

Photovoltaic Technology

Macairestraße 3 - 5

D - 78467 Konstanz

Phone + 49 7531 996770

Fax + 49 7531 99677444

E-Mail info@sunways.de

www.sunways.de

Technical Hotline: +49 7531 99677577

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