Growatt 8000MTL-S - 6.5 Grounding the inverter; 6.6 RS485 cable connection

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CAUTION
If the inverter is not equipped with a DC switch but this is mandatory in
the country of installation, install an external DC switch.
The following limit values at the DC input of the inverter must not be
exceeded:
Types
Max current input A
Max current input B
Growatt 7000MTL-S
25A
12.5A
Growatt 8000MTL-S
25A
12.A
6.4.2 Connecting the PV Array (DC input)
DANGER
Danger to life due to lethal voltages!
Before connecting the PV array, ensure that the DC switch and AC breaker are
disconnect from the inverter. NEVER connect or disconnect the DC connectors
under load.
Make sure the maximum open circuit voltage(Voc) of each PV string is
less than the maximum input voltage of the inverter.
Check the design of the PV plant. The Max. open circuit voltage, which can
occur at solar panels temperature of -10℃, must not exceed the Max. input
voltage of the inverter.
WARNING
Improper operation during the wiring process can cause fatal injury to operator or
unrecoverable damage to the inverter. Only qualified personnel can perform the
wiring work.
6.5 Grounding the inverter
The inverter must be connected to the AC grounding conductor of the power
distribution grid via the ground terminal (PE) .
WARNING
Because of the transformerless design, the DC positive pole and DC negative
pole of PV arrays are not permitted to be grounded.
6.6 RS485 cable connection
Definitions of RS485 socket (standard) as follows: