6.4 Wiring and testing
◼ The use of PV modules with different electrical characteristics in a PV system
is prohibited.
◼ Excessive cables must be organized or fixed in the proper location, do not
cover the cell area.
◼ For applications requiring high operating voltages, several PV modules may
be connected in series to form a PV string, then the system voltage is equal to
the sum of the voltages of each PV module
◼ For applications requiring high operating currents, several strings of PV
modules can be connected in parallel to form a PV string, then the system
current is equal to the sum of the currents of each PV module string.
◼ A maximum system voltage of 1500VDC is allowed.
◼ The maximum number of PV modules in series depends on the system design,
the type of inverter used and the environmental conditions.
◼ Depending on the maximum series fuse rating of the PV module and local
electrical installation codes, if the PV module does not have any fuses or
blocking diodes, make sure to connect no more than two strings in parallel.
◼ There is no limit to the number of PV modules that can be connected in parallel
(fuses per string should be considered), the number of PV modules is
determined by system design parameters such as current or power output.
◼ Please refer to local regulations to determine the size, type and temperature of
the system conductors.
◼ PV modules are equipped with connectors for system electrical connections,
please refer to local regulations and data sheets that allow the use of connectors.
◼ To ensure a reliable electrical connection and to prevent possible moisture
ingress, connectors must fit and lock together until a click is heard.
The DC power generated by the PV system can be converted to AC power and
connected to the public grid, as the local power company's policy for connecting
renewable energy systems to the grid varies from region to region. You can ask your
PV system design engineer or integrator for help in obtaining building permits,
inspections, and approvals from your local power company's department.
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