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DSP 3320i-ODS, DSP 3325i-ODS, DSP 3333i-ODS
User manual
4.5 Connecting DC Input Power Cables
Connect the DASS TECH inverter to PV arrays over DC input power cables.
Input mode selection：
DASS TECH inverter
independently, but also can be operated in parallel, According to the system design,
the user can choose the mode of MPPT operation.
Independent mode (default):
If the two MPPT panels is independent, the input mode should be set as "independent
mode".
The setting method is introduced at chapter 6.3.
Parallel mode :
If the two MPPT panels is paralleled together by combiner, the input mode should be set as
"parallel mode".
The setting method is introduced at chapter 6.3.
Note
According to the inverter type, choose the inverter accessories (cables, fuse holder, fuse, breaker etc.), DASS TECH
inverter with PV array should be excellent performance, reliable quality. The open circuit voltage of PV must be
less than Maximum DC input voltage of DASS TECH inverter, The output voltage of the solar array must be
consistent with the MPPT voltage range.
Table4-5 MPPT voltage range
DSP 3320i-ODS
Type
MPPT voltage range
Max. input voltage
has 2 MPPT, The two MPPT can run
DSP 3325i-ODS
DSP 3333i-ODS
230~960 Vdc
1100 Vdc
DSP 3320i-ODS, DSP 3325i-ODS, DSP 3333i-ODS
User manual
DC connection between inverter and string panel should be specified PV cable. Line voltage
drop should be less than 2% from junction box to inverter.Inverter is recommended to be
installed on or near PV panel bracket , which can save cable and reduce DC loss.
Note
Danger
Caution
Note
33
34
Check polarity of PV array, to ensure the correct wiring of PV array;
Please don't put the positive or negative of the PV array connect to
earth.
PV modules generate electric energy when exposed to sunlight and can
create an electrical shock hazard. Therefore, when connecting DC input
power cable, cover PV modules by using opaque cloth.
Before performing electrical connections, ensure that voltages of the DC
cables should be within the safe voltage range, that is, lower than 60 V
DC, and the DC SWITCH is OFF. Otherwise, the high voltage may result
in fatal danger.
Ensure that the following conditions are met. Otherwise, fire accident may occur.
PV modules connected in series in each PV array are of the same specifications.
The open-circuit voltage of each PV array is always lower than or equal to 1100 V DC.
The open-circuit voltage of each PV array is always lower than or equal to 15 A DC.
The output power of each PV array is always less than or equal to the maximum input
power of the DASS TECH inverter.
The positive and negative terminals of PV arrays connect to the positive and negative
DC input terminals respectively.
If the DASS TECH inverter connects to the power grid directly, ensure
that the PV arrays are not grounded.
If the DC voltage is a non-zero value between the positive terminal of PV
arrays and the ground, the PV arrays are subject to insulation faults.
Rectify the fault before connecting cables.
During PV array and DASS TECH inverter installation, the positive or
negative terminals of PV arrays may be grounded if power cables are
not properly installed or routed. In this case, an DC short circuit may
occur and damage the DASS TECH inverter.
If the PV arrays need to be grounded, install a three-phase four-wire
isolation transformer on the output side and disable the ISO detection
function by referring to 6.2.10 Setting Isolation Parameters. If an
isolation transformer is not installed, the DASS TECH inverter may be
damaged.
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