PV Grid-tied Inverter SPI-B X2 Series (8K-25K)
User Manual
3 Installation
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Tech Co., Ltd.
21
Inverter
Grounding
system
√
×
Lightning
rod
Figure3-15
The grounding of inverter
----End
3.5.3 PV String Input Wiring
When installing, use the equipped DC terminals and PV connectors to avoid inverter damage.
Switch off the DC switch before connecting the PV string.
Ensure that the connection between PV sting and inverter at positive pole and negative pole is
correct.
The DC input voltage should be less than the max. input voltage of the inverter.
It's forbidden to connect the positive pole or negative pole of PV string with grounding wire, or it will
cause inverter damage.
The PV string terminal not connected must take waterproof and shockproof measures.
The inverter has two groups of MPPT. The model, quantity, installation angle and direction of the PV
strings connected with PV string terminals must be the same. If the system just has two groups of PV
strings, the larger power one should be prior to connect with PV1, the other should be connected with
PV2.
Use the DC terminals and PV connectors in the accessories for DC input wiring. There are two types
of PV connectors: positive connectors and negative connectors, which respectively use positive metal
terminals and negative metal terminals. The specific steps are as follows.
Step 1
Strip the insulation layer of the positive and negative wires for 7mm by wire stripper, as shown in
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