Specifications

V97-600002 Page 12 of 31
2.3.5 Connecting the Inverter to the Electrical Grid
Two circuit boards are located inside the Inverter:
• The Control Board (at the top of the inverter).
• The Power Distribution Board (at the bottom of the inverter) with the
following terminals:
• The AC connection terminal.
• The DC connection terminal.
• The internal Ground Fault Interrupt fuse.
WARNING: Replace the GFI fuse with the same type and rating of fuse. The
inverter uses only Littelfuse KLKD001 1A/600V.
The inverter is connected to the electrical grid using 3 wires - LINE 1, LINE 2 and
GROUND.
NOTE: To avoid an increase in AC voltage to unacceptable values while the inverter
is connected, the grid impedance value at the connection point should be as low as
possible. By keeping the grid impedance value low, the inverter will achieve higher
system efficiency and avoid nuisance shutdowns. The total impedance of the grid plus
the interconnecting AC wires should be less than 1.25 Ohm.
WARNING: Ensure the main 240V (or 208V for the PVP 2800) breaker at the
circuit breaker panel is switched OFF before connecting to the AC terminal block.
To wire the inverter to the main utility grid, follow these steps (see Figure 6):
1. Run the conduit from the main breaker panel to the bottom of the inverter.
Insert the fitting in the center opening of the inverter and fasten it with a
locking nut.
2. Feed the LINE 1, LINE 2 and GROUND wires through the conduit and into a
center opening of the inverter.
3. Connect the GROUND wire to the terminal marked “earth ground” inside the
inverter.
4. Connect the LINE 2 wire to the terminal marked “line 2” inside the inverter.
5. Connect the LINE 1 wire to the terminal marked “line” inside the inverter.
6. Ensure all connections are wired correctly and properly torqued. Tighten the
terminal block screws to 0.5 Nm (0.37 ft-lb).
NOTE: In the PVP1100 units, LINE 1 wire is the only phase voltage wire, LINE 2
is neutral, and LINE 3 is the AC GROUND.