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Installation
2–20 975-0053-01-01
Figure 2-13 Long distance grounding
Figure 2-14 Simplified electrical wiring diagram
ST Unit
Main Utility
Breaker Panel
Utility
Meter
Solar
Array
DC Wiring
(and ground)
AC Wiring
Array Ground Rod Utility Ground Rod
Utility Ground Wire
Ground
Bar
Ground
Bar
> 100 feet (30 m)
Array Ground
Wire
Ground
Frame to
Pole
AC
Wiring
AC
Wiring to
Utility
Bonded Neutral Wire
Sun Tie Ground Rod
Sun Tie Ground Wire
Buried Copper Wire Buried Copper Wire
INVERTER
+
–
PV
ARRAYS
PV COMBINER BOARD
+
–
L1
L2
G
PV GROUND FAULT
BREAKERS (OPTION)
100 A
1 A
UTILITY
GRID
A
SOV
NOTES:
INSTALLER CONNECTIONS REQUIRED
AT POINTS
(A)
AND
(B)
TO THE
INVERTER ENCLOSURE.
THE UTILITY METER MAY BE A
BI-DIRECTIONAL METER OR DUAL
METERS.
OBTAIN UTILITY COMPANY APPROVAL
BEFORE INSTALLING.
15 A
15 A
LIGHTNING
ARRESTOR
(OPTION)
100 A
20 A
+
20 A
+
20 A
+
20 A
+
20 A
+
20 A
+
–
–
–
–
–
–
B
STXR UNIT
L2
MAIN SERVICE PANEL
L1
GROUND
G
L1
L2
N
UTILITY METER
L2
L1
Main
Breakers
Sun-Tie
Breakers
Extra Ground Rod
Only Required on
Long Runs > 100
feet (30 m).
NEUTRAL
N
L2
L1
+
+
+
+
+
+
–
–
–
–
–
GROUND
BAR
G
– +
Buried copper wire if second ground rod is used