14
PV Array Grounding
Grounding conductor of PV panel brackets must be firmly connected to earth at PV
array side and inverter side and SP side. The sectional area of grounding conductor
should be equal to the sectional area of DC grounding conductor. The minimum wire is
AWG10.
DC Grounding
Select the DC Grounding mode according to the local standard and use the PV
grounding terminal box and DC Grounding wires of the same specification.
Grounding Device
If the positive pole or the negative pole of PV array needs to be grounded in the PV
system, the inverter output should be insulated by Isolation Transformer. Isolation
transformer must conform to UL standard.
Connection as below:
13
When connecting to electronic connection, please remove the cover of the wirebox
show as above and using pipe for routing cable. Pipe introduction as below.
When you connecting cable to terminal of inverter. A special terminal is suggested to
used, Bring the wire back through the crimp bead and flatten, then connect to inverter,
show as below:
SPH must be grounded by cable, the grounding point is showed as follow, and the
minimum grounding cable wire is AWG10.
(1) Nut
(2) Fitting
(3) Conduit
M 6
5.4 Grounding connection
Cable
Type
Conductor
Cross-sectional
Area Range
Source
Energy
meter signal
cable
Battery
signal cable
Net cable,complies with UL2919,
CM/CMG (NEC type), or CMH
(CSA type)
NA
Can be purchased
from Manufacturer
Purchased by the
battery supplier or
customer
PV input
power cable
1.PV cable that meets the 600 V
standard.
2.Use cables that can withstand
90°C (194°F) or 105°C (221°F).
3.Single-core outdoor copper
cable.
10–8 AWG
Purchased by the
customer
(Optional)
Ground cable at
the PV
1.Use cables that can withstand 90°C
(194°F) or 105°C (221°F).
2.Single-core outdoor copper cable
6 AWG
Purchased by
the customer
Battery cable
1.Use cables that can withstand 90°C
(194°F) or 105°C (221°F).
2.Single-core outdoor copper cable
6-4 AWG
Purchased by
the battery
supplier or
AC output
power cable
1.Use cables that can withstand 90°C
(194°F) or 105°C (221°F).
2.Use four single-core outdoor copper
cables (L1, N, L2, PE).
L1,N,L2:
10–6 AWG
PE: 6 AWG
Purchased by
the
customer
EPS output
power cable
1.Use cables that can withstand 90°C
(194°F) or 105°C (221°F).
2.Two single-core outdoor copper
cables (L1 and L2)
12–6 AWG
Purchased by
the
customer
PV array
Inverter
Transformer
Grid
L
N
PE
