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Electrical Connection
7.2.3 PV Connection
DANGER!
• High DC voltage will be generated by PV modules when exposed to sunlight. Death
or lethal injuries will occur due to electric shock.
• Make sure the DC switch are turned off and AC breaker are disconencted from the
inverter before PV connection. and no live voltages are present on the PV input and
AC output circuit.
• Make sure that the PV module output is well insulated to ground.
CAUTION!
• Power is fed from more than one source and more than one live circuit. Note that all
DC and AC terminals may carry current even without connected wires.
Requirements for PV connection
• Open circuit voltage
»
The open circuit voltage of the module array should be less than the
maximum PV input voltage (1000 V) by the inverter.
»
The working voltage should be within the MPPT voltage range (110-950 V).
Consider the impact of low temperature on the voltage of the photovoltaic
panels, as lower temperatures tend to result in higher voltages.
• PV module
»
PV modules within the same MPPT channel should be of the same type,
same model, same number, aligned and tilted identically.
»
The positive or negative pole of the PV modules is not grounded.
»
The positive cables of the PV modules must be connected with positive DC
connectors. The negative cables of the PV modules must be connected with
negative DC connectors.
• Multi PV module connection mode
+
-
-
+
-
+
PV 1
PV 2
X3-IES
Figure 7-29 "Multi" mode connection diagram
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