Delta RPI M30A_120 Operation And Installation Manual page 26

Wiring
Note for Field Wiring
Due to the limitation of physical wire also the DC connector used in the inverter,
the absolute maximum current of each DC connector should be always observed
as following table to keep fire risk away.
Note that, the following value is provided to identified and checked the justification
for field wiring instead of the DC current rating of inverter.
Table 4-1 : Maximum current rating of each DC connector
Connection with PV Combiner Box
M30A :
_120
- Normally, the output current of combiner box is larger than 16A.
Thus it can't be used as the following diagram (Shown as Figure 4-7).
The max input current of each string is 7.5A.
RPI M30A
_120
RPI M30A
_121
Figure 4-7 : Wrong connection – 1
16A
32A
26