Wiring the Inverter
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Connecting Inverters in Parallel
GT Inverters can be connected in a parallel configuration for larger PV array
systems. In this configuration, separate s ola r array s are req ui red for eac h GT
Inverter unit. The output of each GT Inverter feeds a separate dual-pole 20-Amp
circuit breaker (L1 and L2) in the main utility service panel.

DC and AC Wiring for Inverters in Parallel

The following procedures are illustrated in Figure3-6. The illustration and
instructions assume only two inverters, but in fact more than two inverters can be
used in a parallel configuration.
If there will be more than one PV string, label the positive and negative wire pairs
appropriately (for example: PV 1, PV 2).
Connecting DC
wiring To wire the PV array to GT Inverters in parallel:
1. Install the DC conduit from the PV strings to the GT Inverter wiring boxes,
through appropriate knockout holes. Metal conduit is highly recommended.
2. Remove the wiring box cover (see page 3–2).
3. Route the wires from the PV string(s) through the conduit and into the wiring
box.
4. Connect the DC Ground from each PV array to the GND bar in the wiring
box.
5. Follow the instructions on page 3–4 for connecting POSITIVE (+) and
NEGATIVE (–) wires from each PV array to each GT Inverter.
6. Ensure all connections are correctly wired and properly torqued according to
values shown in Table3-1 on page 3–5.
Connecting AC
wiring To wire the main utility serv ic e panel to the GT Inverters in parallel:
1. Run conduit from the main utility service panel to the wiring boxes of the GT
Inverters.
2. Follow the instructions on page3–7 for connecting L1 and L2 HOT wires and
ground wire from the main utility service panel to each GT Inverter.
3. Ensure all connections are correctly wired and properly torqued according to
values shown in Table3-1 on page 3–5.