Electrical Connection
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4
Electrical Connection
Schematic Diagram and Circuit Design
The electrical schematic diagrams of inverter are as shown in Fig. 4-1a and 4-1b.
L1
L2
L3
PE
PV1+
PV2+
PV1-
PV2-
DC Switch
MPPT1
AC Output
PV Input
PV3+
PV4+
PV3-
PV4-
PV23+
PV24+
PV23-
PV24-
DC SPD
BUS
AC
EMI
AC Relay
MPPT2
MPPT12
PV Sense
...
...
...
LC Filter
AC SPD
DC/AC
RCD
IMD
DC
EMI
Figure 4-1a Schematic Diagram of the 24 Input Inverter
L1
L2
L3
PE
PV1+
PV2+
PV3+
PV1-
PV2-
PV3-
DC Switch
MPPT1
AC
Output
DC SPD
BUS
AC
EMI
AC Relay
MPPT2
MPPT12
...
...
...
LC Filter
AC SPD
DC
EMI
DC/AC
PV Input
PV4+
PV5+
PV6+
PV4-
PV5-
PV6-
PV34+
PV35+
PV36+
PV34-
PV35-
PV36-
Figure 4-1b Schematic Diagram of the 36 Input Inverter
Cable Specifications
Cable
Type
Outer dia. cross-sectional area
DC
Use
90
℃
copper/*aluminum wire
10~4AWG
GND
Outdoor copper core
wire
/
Phase wire diameter/2
AC
Outdoor
three-core
copper/ aluminum wire
≤
∅
92mm
Aluminum alloy cable.
L1,L2,L3: 250kcmil~750kcmil
PE: Phase wire diameter/2
Comm.
Communication cable UTP CAT-5e or Belden 3106A or equivalent
*For Aluminum DC cable Bimetal ferrule shell be used.
Table 4-1 Cable Specifications