Wiring the Inverter
Wiring Requirements
WARNING: Shock hazard
Check for existing electrical or plumbing prior to drilling holes in the walls.
The AC and DC terminal blocks in the GT Inverter accept wire sizes from
#14 AWG to #6 AWG. Undersized wiring can result in significant power losses and reduction in system efficiency. Strip all wires 9 mm (3/8 inch) and torque to a maximum 16
For safety and compliance with the NEC, run AC, DC, and communication wires in separate conduits.
WARNING: Fire hazard
Wiring should not be undersized. Wire sizes must be coordinated with the array maximum short circuit current or the AC breaker sizes used. Ensure wiring is in accordance with the NEC or applicable codes.
AC Circuit Breaker Requirements
The main utility service panel must dedicate a double pole breaker to operate each GT Inverter installed. This breaker must be sized to handle the rated maximum output voltage and current of the GT Inverter (see “Electrical Specifications”, “Output” on page
DC/AC Disconnect Switch
The wiring box includes a 600 volt PV/Utility disconnect switch that switches both AC and DC at the same time.
Depending on the installation, an external AC and/or DC disconnect may be required if the inverter is installed in a location not easily accessible to utility or fire personnel. Consult local authorities for additional information.
Important: The DC terminal block has six inputs for connecting up to three PV strings. In accordance with applicable codes, if the array consists of more than two strings, external fusing may be required to prevent conductor overloads.