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Installation
3.5 Electrical Installation for DC Wiring
PV array converts sunlight into electric power with high DC voltage and high DC
current which can cause dangerous electrical shock hazard on the DC connector.
- Use an opaque material to cover the PV array to make sure PV array will not
generate voltage to cause electric shock during DC wiring.
- Undone PV array must insert dedicated protective cover to protect connector.
- The amount of PV module of each string within one MPPT should be the same
to avoid the circulating current between the strings.
- Max. allowable DC input voltage of inverter is 1100Vdc. Please check the Open
Voltage of PV array in the lowest environmental temperature is under 1100Vdc.
More than 1100Vdc will damage the inverter.
Delta has a right not to offer any warranty.
- The inverter will check the insulation resistance of DC wiring before the first time
operation every day. However, DC ground fault still could damage the inverter
during the operation and not covered by warranty.
- Please make sure the insulation resistance of PV array is high enough.
The inverter has 8 input MPP trackers which is able to operate on flexible PV array
assembling. However, for the highest operating performance of the inverter, strongly
recommend PV array configuration needs to meet the below requirements.
(1) PV arrays design should be considered the lowest environmental temperature
of the site to ensure the maximum DC voltage in any string is under 1000Vdc.
(2) Max. allowable DC input voltage of the inverter is 1100Vdc. More than 1100Vdc
will damage the inverter, and it is an abnormal operation. Delta has a right not
to offer any warranty.
(3) To ensure the inverter operates with the highest performance, the Optimal
Operating Voltage (Vmp) of PV string should be within 600 Vdc ~ 800 Vdc for
each string in STC condition*.
(4) Each MPP tracker provides 2 pairs of DC connector in parallel, below table
offers the correspondence between each MPP tracker and input connectors.
Ensure two strings connected into the same MPP tracker have the same
quantity and PV module part number. Imbalanced PV strings connection in
the same MPP tracker will cause low conversion efficiency.
MPP Tacker
PV String
* STC (Standard Test Condition) means the testing condition is in the Irradiance 1000 W/m²,
Spectrum AM 1.5, and the PV cell temperature is 25°C. Please refer to the specification of the PV
module to get relative technical parameters.
Too much or fewer series quantities of PV string may affect the inverter performance in specific
conditions, so contact with Delta Service Team in your region to confirm the PV array design is
suitable for the inverter.
DANGER : ELECTRICAL HAZARD!!
WARNING !
ATTENTION
1
2
1&2
3&4
5&6
3
4
5
7&8
9&10
36
6
7
11&12
13&14
15&16
8
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