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Installation and operating instructions
QX³ series
4.9 Connecting the PV (DC) generator
Depending on the type of device the PV inverter has up to 3 inputs (input A,
input B and input C). The inputs each have self-sufficient DC-DC controllers
with their own MPP tracker (configurable). Up to 2 strings can be connected
per input.
Thanks to the self-sufficient inputs / MPP trackers generators with different
characteristics
(alignment, dimensioning, etc.) can be operated at the different inputs of one
inverter.
Example view: QX³10000-18000
The following requirements apply to the connected PV generator for each
input (A, B and C):
The generator must be dimensioned in such a way that the lowest open circuit
voltage calculated for the lowest Temperature that can occur at the installation
site is lower than the maximum open circuit voltage of the inverter as
indicated in the technical data. A safety clearance of 50V is recommended for
the lowest Temperature.
If 2 strings are used on one input, then these are connected in parallel in the
device. It is imperative to comply with the following points
The parallel strings must use the same modules and have the same
o
number of modules connected in the series. This must be verified by
measuring equal open circuit voltages before connection is made.
The parallel strings must have the same alignment and roof inclination.
o
The connection cables must be equipped with the required DC plug-in connectors
(Phoenix Contact SUNCLIX) (included in the scope of delivery).
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Q3 ENERGIE Installation and operating instructions QX³ series
Version 1.0, Stand 27.04.2015
41/109
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