40
•
Make sure the PV array is well insulated to ground before connecting it to the
inverter.
•
Make sure the maximum DC voltage and the maximum short circuit current of
any string never exceed inverter permitted values specified in "Technical Data".
•
Check the positive and negative polarity of the PV strings, and connect the PV
connectors to corresponding terminals only after ensuring polarity correctness.
•
During the installation and operation of the inverter, please ensure that the posi-
tive or negative electrodes of PV strings do not short-circuit to the ground. Oth-
erwise, an AC or DC short-circuit may occur, resulting in equipment damage.
The damage caused by this is not covered by the warranty.
•
Electric arc or contactor over-temperature may occur if the PV connectors are
not firmly in place, and SUNGROW shall not be held liable for any damage
caused.
•
If the DC input cables are reversely connected or the positive and negative ter-
minals of different MPPT are shorted to ground at the same time, while the DC
switch is in the "ON" position, do not operate immediately. Otherwise, the inver-
ter may be damaged. Please turn the DC switch to "OFF" and remove the DC
connector to adjust the polarity of the strings when the string current is lower
than 0.5 A.
The following requirements about PV string connection must be met. Otherwise, it
may cause irreversible damage to the inverter, which is not covered by the
warranty.
•
Mixed use of different brand or model of PV modules in one MPPT circuit, or PV
modules of different orientation or angles in a string may not damage inverter
but will cause system bad performance!
•
The inverter enters standby state when the input voltage ranges between 1,000
V and 1,100 V. The inverter returns to running state once the voltage returns to
the MPPT operating voltage range, namely, 160 V to 1,000 V.
5.6.1 PV Input Configuration
•
The inverters SG3.0RT/SG4.0RT/SG5.0RT/SG6.0RT have two PV inputs, SG7.0RT/
SG8.0RT/SG10RT/SG12RT have three PV inputs and SG15RT/SG17RT/SG20RT have
four PV inputs.
•
The inverters have two MPP trackers. Each DC input area can operate independently.
•
The PV strings to the same DC input area should have the same type, the same number
of PV panels, identical tilt and identical orientation for maximum power.
•
The PV strings to two DC input areas may differ from each other, including PV module
type, number of PV modules in each string, angle of tilt, and installation orientation.
User Manual
