Step 4: Install Optional System Shutdown Switch

The Solar Inverter can be wired to a System Shutdown Switch that manually disables the inverter. When the System Shutdown circuit is opened, the AC relay internal to the Solar Inverter is opened, thus disabling Solar Inverter output. The System Shutdown Switch is wired through a low voltage, 12 V DC, 1 A control circuit connected to the Solar Inverter RSD ports.

To install the System Shutdown Switch:

  1. Remove the factory-installed jumper from the RSD IN / RSD Out ports. See Appendix B: Wiring Reference for a detailed wiring reference.
  2. Using minimum 24 AWG conductors, with wiring methods according to code, connect the RSD ports to a suitable DC switch (requirements below).

Optional System Shutdown Switches shall meet the following requirements.

  • Listed or Recognized as "Emergency Stop Button", "Emergency Stop Device", "Emergency Stop Unit", meeting one of the following standards:
    • UL 508 "Industrial Control Equipment"
    • UL 60947-1 "Low-voltage switchgear and control gear- Part 1: General Rules" AND Part 5-1: Control Circuit Devices and Switch Elements - Electromechanical Control Circuit Devices" AND UL 60947-5-5: Mechanical and functional performance requirements
  • Rated for at least 12 V, 1 A
  • Outdoor rated (NEMA 3R or higher)
  • Terminals must accept 24 AWG wire or larger

Recommended System Shutdown Switch Components

The following product (composed of all parts listed below) meets all above requirements for this application:

Eaton M22-PVT Emergency Stop Button
Eaton M22-I1-PG Emergency Stop Enclosure
Eaton M22-K01PV6 Emergency Stop Contactor Block (240 V, 6 A)
Low voltage communication wire (Powerwall communication cable preferred)
½-inch Strain Relief or equivalent
(4) Fasteners and anchors for the 5/16-inch (8 mm) mounting holes on the enclosure

Installation Guidelines for the System Shutdown Switch

  • Installed externally in a readily accessible location, preferably near utility meter
  • Maximum low voltage wire run from switch does not exceed 150 feet (45 m)
  • Control circuit must be installed as Type TC-ER or within an appropriate raceway