HelioSphera HS Atlas Series, Safety And Installation Instructions Manual

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10-SSI-001_rev.005_ENG
Page 24 of 51
6. ELECTRICAL INSTALLATION
As shown in section
5 “Mechanical installation” HS modules must be installed in “portrait”
position.
For optimum system performance, partial shading on modules must be avoided. In
particular, long term or repetitive shading parallel to the cells may lead to irreversible module
damage.
Module damage resulting from installation and/or system design faults is not covered by
module warranty.
Modules may be connected in series and/or parallel to achieve the desired electrical
output as long as certain conditions are met.

Series connection of modules
All modules connected in series must have identical orientation and inclination and belong
to the same type and power category. In series connection the overall voltage of the string is
equal to the sum of the voltage of each module. Never exceed the limit of 1000V on connected
modules. Voc of modules at low temperatures (below 0
°
C) should be taken into account. Thus,
a maximum of 6 modules may be connected in series (when using inverter with 1000V max DC
input voltage).
Contact HelioSphera engineers if you are not sure for the total number of
modules you can connect in series, with any specific inverter you are going to use .
Fig. 20 Series connection of modules (back view)

Parallel connection of strings
All strings connected in parallel should consist of modules with identical orientation and
inclination. In parallel connection the overall current is equal to the sum of the current of each
string/module. In order to avoid/eliminate reverse currents a maximum of 3 strings can be
paralleled without the use of a fuse or a blocking diode. In case that more than 3 strings must be
paralleled, then follow one of the following solutions (in any case use appropriate fuse/diode
type, i.e. 1000V DC):