Dc Connection; Symmetrical And Asymmetrical Power Input - Delta RPI M50A_120 Installation And Operation Manual

5 Planning the installation
5.8

DC connection

NOTICE
Machine and equipment damage may occur.
Exceeding the maximum current per DC input can cause an overheating of the DC inputs.
► Always consider the maximum current of the DC inputs when planning the installation.

5.8.1 Symmetrical and asymmetrical power input

The inverter operates using two separate MPP trackers that can handle both symmetrical and asymmetrical
power input. This allows you to set up complex PV system designs. For example: east/west-facing roof (asym-
metric load) or a south facing roof such as a dormer (asymmetrical load).
Fig. 5.13: Concept of 2-MPP-tracker system for asymmetrical power input
The following figures explain how symmetrical and asymmetrical power input is handled:
Symmetrical power input
Input Current
I
max
Max. Power MPPT Range
U
startup
Input Current DC 1
Fig. 5.14: I-U curve for symmetrical and asymmetrical power input (schematic diagrams)
26
kW
East
8:00
U
max
Input Voltage
Input Current DC 2
West
13:00 18:00
Asymmetrical power input
Input Current
I
max
U
startup
Input Current DC 1
Total
East Roof
West Roof
Max. Power MPPT Range
Input Voltage
Input Current DC 2
Installation and Operation Manual for RPI M50A
U
max