Electronics
AC Module System Installation Manual
Copyright © 2020 LG Electronics.
All Rights Reserved.
42
Rev. 1.0
Step 1. Check your distribution panel to figure out what type of AC distribution system you have. Use a volt-meter to find out the
phase and line-to-line voltage across L1, L2 and neutral. If the AC distribution system has 208VAC for L1-L2 and 120VAC
for L1-N and L2-N, the AC modules should not be connected more than 10 AC modules per a 2-pole 20AMP circuit breaker
as described above.
Step 2. Install an AC junction box in an appropriate position for a transition cable to reach to the last AC module. If necessary, move
the AC junction box close to the last AC module.
Step 3. Check the extension/transition cables to verify they have not been pulled too tight or are hanging too loose. Attach cables
on a structure like PV racks or rails using the cable clips. Also, place extension/transition cables or AC cables under a
structure so that wires can avoid direct sunlight exposure and water immersion.
Step 4. Connect the equipment’s grounding conductor from all of the AC modules to the AC junction box by connecting to the
distribution panel.
Step 5. Make sure that a conduit protects wires from the AC junction box to the distribution panel from rain, snow or direct sunlight.
Transition Cable
Conductor
Color
Description
L1
Black
Line to neutral voltage 120VAC
L2
Red
Line to neutral voltage 120VAC
Neutral
White
Neutral between L1 and L2
External Equipment Grounding Conductor (Array AC junction box)
Ground
Green/Bare
Conductor to connect normally non–current carrying metal parts of equipment together
General Wiring
L1
Black
Line to neutral voltage 120VAC
L2
Red
Line to neutral voltage 120VAC
L1-L2
-
Line to line voltage 208VAC
Neutral
White
Neutral between L1 and L2
Ground
Green
Conductor to connect normally non–current carrying metal parts of equipment together
General wiring
Meter
X 10
2-pole
N L1 L2
20A
G
Connect the general AC cables in the following order:
Distribution panel
AC junction box
An array of AC modules
There is an example for AC output cables connection of single phase 208VAC below.
The microinverter is compatible with 240VAC/120VAC and 208VAC/120VAC. No additional setting is required.
AC output single phase 208VAC