9
Quick installation guide for RPI M15A M20A inverters
Always adhere to the specifi c regulations applicable in your coun-
try or region
Always adhere to the specifi c regulations defi ned by your grid
operator
For the safety of the user and for the security of your installation,
install required safety and protection devices that are applicable
for your installation environment (example: automatic circuit
breaker and/or overcurrent protection equipment).
2
Use the proper upstream circuit breaker to protect the inverter:
Model
Upstream Circuit Breaker
RPI-M15A
30 A
RPI-M20A
40 A
G N L1
L3
L2
N
L1
L2
L3
PE
To solar inverter AC
plug
The inverter is not capable of feeding in DC residual currents due
to its design. It fulfi lls this requirement in accordance with DIN
VDE 0100-712.
The possibilities of faults were examined by Delta without tak-
ing the integrated RCMU (residual-current monitoring unit) into
account When examining these faults in terms of the current
valid installation standards, no danger in combination with a type
A upstream residual-current device (RCD) can occur. Therefore
faults that would otherwise require the use of a type B residual-
current device due to the inverter can be excluded.
The integrated all-pole sensitive RCMU provides additional
safety. RCD Type A can be used for this inverter, according to the
following table.
M15A M20A
Minimum tripping current of the RCD
mA 100
100
NOTE
The value of the tripping current mainly depends
on the quality of the solar modules, the size of
the PV array and environmental conditions (e.g.
humidity).
Important information regarding safety
AC cable requirements
Use properly sized wires to connect to the correct poles (see
table)
AC connector
Amphenol C16-3
Current rating
40 A
Min. / max. cable diameter
11 20 mm
Min. / max. wire diameter
6 mm
2
Recommended torque for terminal
screws
0 7 Nm
The AC plug delivered with the inverter can be used with fl exible
copper cables.
Read and follow the instructions delivered with the AC plug
When calculating the cross section of the cable, consider:
● material used
● thermal conditions
● cable length
● type of installation
● AC voltage drop
● power losses in cable
Always follow the system installation requirements defi ned for
your country!
Australia/New Zealand: Always follow the system installation
requirements defi ned by AS/NZS 5033:2005 regarding minimum
cable sections and protections against overheating due to high
currents!
Grounding the inverter
The inverter must be grounded via the AC connector’s PE con-
ductor To do this, connect the PE conductor to the designated
terminal of the AC plug
Markings on the inverter
In some countries, the following labels have to be applied on the
front of each micro inverter. Please check applicable national and
local standards and regulations
WARNING
Dual Supply
Do not work on this equipment until it is isolated from
b oth mains and on site generation supplies
Isolate on-site Generating Unit(s) at … … … … … … … … … … … … … … … … … … …
Isolate mains supply at… … … … … … … … … … … … … … … … … … … … …
Warning – Only persons authorised by the DNO may remove the main cut out fuse
Warning
Two sources of voltage present
- distribution network
- photovoltaic panels
Isolate both sources before
carrying out any work
