Installation Guide

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damage the module mechanically or electrically.

· Modules can be wired in series to increase voltage

or in parallel to increase current. To connect modules

in series, connect the cables from the positive

terminal of one module to the negative terminal

of the next module. To connect in parallel,

connect the cables from the positive terminal of

one module to the positive terminal on the next

module.

· The quantity of bypass diodes in the module's

junction box may vary depending on the model

series.

· Only connect the quantity of modules that corres-

ponds to the voltage specications of the inverters

used in the system. In addition modules should not

be connected together to create a voltage higher

than the maximum permitted system voltage

stated on the module nameplate, even under the

worst local temperature conditions (see Table 1

for the correction coecients that apply to open-

circuit voltage).

· A maximum of two strings can be connected in

parallel without the need to incorporate an over-

current protection device (fuses, etc.) in series

within each string. Three or more strings can be

connected in parallel if an appropriate, certied

over-current protection device is installed in series

within each string.

· Only modules with similar electrical outputs

should be connected in the same string to avoid or

minimize mismatch effects in arrays.

· To minimize risk in the event of an indirect

lightning strike, avoid forming loops with the

wiring when designing the system.

· The recommended maximum series fuse rating is

stated in a table in the Annex C.

· Modules should be safely xed to bear all expected

loads, including wind and snow loads.

· A minimum clearance of 6.5 mm (0.25 in) between

modules is required to allow for thermal expansion

of the frames.

· The small drainage holes on the underside of the

module must not be blocked.

OPTIMUM ORIENTATION AND TILT

· To maximize your annual yield, nd out the

optimum orientation and tilt for PV modules

in your region. The highest yields are achieved

when sunlight shines perpendicularly onto the PV

modules.

AVOID SHADING

· Even minor partial shading (e.g. from dirt deposits)

reduces yields. A module can be considered to be

unshaded if its entire surface is free from shading

all year round. Sunlight should be able to reach the

module even on the shortest day of the year.

· Constant shading conditions can affect module

service lifetime, due to accelerated ageing of the

encapsulation material and thermal stress on the

bypass diodes.

RELIABLE VENTILATION

· Sucient clearance (at least 10 cm (3.94 in))

between the module frame and the mounting

surface is required to allow cooling air to circulate

around the back of the module. This also enables

condensation or moisture to dissipate.

· According to UL 1703, any other specic clearance

required for maintaining a system re rating

should prevail. Detailed clearance requirements

pertaining to system re ratings must be provided

by your racking supplier.

5.1

MODULE WIRING

CORRECT WIRING SCHEME

· Ensure that the wiring is correct before starting up the

system. If the measured open circuit voltage (Voc) and

short-circuit current (Isc) differ substantially from the

specifications, this indicates that there is a wiring fault.

· When modules have been pre-installed but the system

has not been connected to the grid yet, each module

string should be kept under open-circuit conditions