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PV modules connected in series in each PV string must be of the same specifications.
The maximum open-circuit voltage of each PV string must be always lower than or equal
to 1000 V DC.
The maximum short-circuit current of each PV string must be always lower than or equal
to 23 A.
The positive and negative terminals of PV modules must be connected to the positive and
negative DC input terminals of the SUN2000 respectively.
If the SUN2000 is directly connected to the power grid and no three-phase four-wire
isolation transformer is connected to the output side, ensure that the PV strings are not
grounded.
If the DC voltage is a stable non-zero value between the positive terminal of a PV string
and the ground, the PV string has an insulation fault. Rectify the fault before connecting
cables.
During PV string and SUN2000 installation, the positive or negative terminals of PV
strings may be grounded if power cables are not properly installed or routed. In this case,
an AC or DC short circuit may occur and damage the SUN2000.
If the PV strings need to be grounded, install a three-phase four-wire isolation transformer
on the output side and set the parameter of Isolation to Input Grounded, With TF by
following the instructions in 7.2.11 Setting Isolation Parameters. If no isolation
transformer is connected, the SUN2000 will not operate properly.
Context
Figure 5-16 shows the MPPT distribution of the SUN2000.
Figure 5-16 MPPT distribution
The SUN2000-8KTL to SUN2000-12KTL provide two MPPT routes to track the
maximum power point for PV strings. Therefore, two to four DC inputs should be evenly
distributed on two terminal groups.
The SUN2000-15KTL to SUN2000-28KTL provide three MPPT routes to track the
maximum power point for PV strings. Therefore, two to six DC inputs should be evenly
distributed on three terminal groups.
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