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In systems with more than two modules in series, high reverse current can flow through
cells that are shaded partially or outright when part of a module is shaded and the rest is
exposed to the sun. These currents can cause the affected cells to get very hot and could
even damage the module. To protect module from such high reverse currents.
All modules rated greater than 55 Watt have bypass diodes already integrated in the
junction box.
In the unlikely event of diode failure Renogy recommends a qualified service technician be
employed to determine if diodes have failed and to make replacement.
Do not use modules of different configurations in the same system. Several modules are
connected in series and then in parallel to form a PV array, especially for application with a
high operation voltage. If modules are connected in series, the total voltage is equal to the
sum of individual voltages. For applications requiring high currents, several photovoltaic
modules can be connected in parallel; the total current is equal to the sum of individual
currents.
The DC electrical energy generated by photovoltaic systems may also be converted to AC
and connected to a utility grid system. As local utilities’ policies on connecting renewable
energy systems to their grids vary from region to region, consult a qualified system
designer or integrator to design such a system. Permits are normally required to install such
a system and the utility must formally approve and inspect such a system before it can be
connected to the grid.
Module is supplied with Multicontact connectors (PV-KBT4 and PV-KST4) to use for
system electrical connections. Use the National Electric Code to determine system wiring
size (refer to NEC clause 310), type and temperature rating of conductors to be connected
to the module’s connectors. Wiring connected to the module’s wiring should be #12 AWG
(minimum) and must be temperature rated at 90°C (minimum).
In Canada installation shall be in accordance with CSA C22.1, Safety Standard for
Electrical Installations, Canadian Electrical Code, Part 1.
The cross section area of cable and the capacity of connector must be selected to suit the
maximum system short circuit current, otherwise the cable and connector will be
overheated under large current. Refer to NEC for details.
Module overcurrent protection, rated for DC use fuses
General
Grid Connected Electrical System
