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Figure 6. PV module junction box
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Figure 7. PV series connection
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Figure 8. Diagram for the module´s ground connection
Figure 9. Example of PV mounting.
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Solargen solar PV
junction box
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3. PV KIT INSTALLATION
3.2.
PV Generator
3.2.1.
PV series connection
The PV generator is a group of one or more PV modules connected in
series, parallel or both.
The series connection of the PV modules is accomplished by connecting
the positive connector to the negative connector of the following module.
(Figure 7)
Electrical installation
You should not use modules with different characteristics in the same
installation. The maximum number of modules to be installed in series on
the installation, N_(max), is calculated using the following formula:
N_(max) = V_(Max System) / V_(OC (CTS))
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The maximum voltage supported on an installation, with Baxi´s photovol-
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taic modules is 1000 (V)
In Series connection
The resultant voltage of connecting two or more modules in series is the
sum of individual voltages of each module. You should never connect
a number of modules whose resultant voltage exceeds the maximum
system voltage (Vsyst).
Parallel connection
The resultant electrical current of connecting two or more modules in
parallel, is the sum of the individual electric currents in each module.
Please use an external junction box to make the parallel connection bet-
ween modules.
Whenever more than 2 strings of modules in parallel are connected, each
of those strings should be protected with a fuse that could cut the string
in case of default. The value of the fuse must be 10 A or at maximum 12
A. A fuse must be used in each polarity.
Grounding
For safety electrical reasons, the module frame and the installation must
be grounded, to ensure the equipotentiality. This connection also ensu-
res that any electric current leakage from the equipment will flow to the
ground. The connection of the frame should be performed by clamping
and should ensure the contact.
MPrime recommends the use of suitable accessories for this purpose.
In the frame there are 4 holes with a 4 mm diameter, indicating the earth
symbol, to tighten the connectors of ground protection (see Fig 8). The
section of the protective earth conductor must be equal to or greater than
the section of the active conductor.
The number of PV modules connected in series depends on the kW out-
put of the inverter.
3.2.2.
PV module fastening
The PV modules should be mounted to frames or roof mountings
supplied. No other frame is suitable for the mounting.
(Figure 6)
(Figure 9)
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