Installation

On-Grid AC Wiring for Sine Wave Plus Inverters

Prepare the AC wiring as follows for an on-grid application using series-stacked, Sine Wave Plus Inverter/chargers. The following steps are illustrated in

Figure 2-5.

Grounding

1.

Connect GROUND (green) wires:

 

 

a)

from the primary earth/ground to the main utility panel,

 

 

b)

from the main utility panel to the AC distribution panel (Sub-panel),

 

 

c)

from the L1 inverter AC ground bar to the utility panel ground bar,

 

 

d)

from the L2 inverter AC ground bar to the utility panel ground bar.

Neutral Bonds

2.

Connect NEUTRAL (white) wires:

 

 

a)

from the Neutral bus in the utility panel to the ground bar in the utility

 

 

 

panel. (Neutral-to-ground bond),1

Inverter to AC Distribution Panel

Inverter to Utility Panel

b)from the L1 inverter NEUTRAL OUT terminal to the L2 inverter NEUTRAL 2 terminal (Interter-to-inverter neutral bond),

c)from the L1 inverter NEUTRAL OUT terminal to the utility or utility panel neutral bus (Common neutral bond in utility panel),

d)from the L2 inverter NEUTRAL OUT terminal to the AC distribution panel neutral bus (Common neutral bond in sub-panel),

3.Connect HOT wires:

a)(black) from the L1 inverter AC HOT OUTPUT (120 Vac) to the inverter panel L1 terminal.

b)(red) from the L2 inverter AC HOT OUTPUT (120 Vac) to the inverter panel L2 terminal.

4.Connect HOT wires:

a)(black) from the utility panel HOT L1 terminal to the L1 inverter’s AC1 GRID terminal.

b)(red) from the utility panel HOT L2 terminal to the L2 inverter’s AC1 GRID terminal.

5.Torque all inverter terminal block connections to 25 inch-pounds.

1.This connection may already exist from the original installation of AC service to the building.

2–10

975-0059-01-01 Rev A