sunMAX - How-to: Planning for Commercial Installs

Note/Disclaimer: All recommendations in this and other articles should not be considered exhaustive nor applicable in all cases. Consult with a certified electrician in your jurisdiction to ensure you are adequately prepared to perform a commercial or three-phase install.


The installation of a sunMAX system on a commercial building or property invokes many requirements not usually encountered in residential installs. 

Commercial installs differ generally from residential installs in the following respects:

  • Size of system, in kWac
  • Presence of three-phase (3ø) electrical service
  • Presence of a Ground Fault Protection (GFP) device at the Main Disconnect
  • Utility requirements related to larger, 3ø systems
  • Requirements for fault current analysis and arc flash labelling
  • Handling of inter-inverter cabling
  • Mounting System
  • Fire Code restrictions on layout
  • Structural engineering considerations (roof-mounted systems)
  • Civil engineering considerations (ground-mounted systems)

Although commercial installs add greater complexity- there are many advantages to performing commercial installs such as increased profits, better access to financing, greater profits for the customer, etc. Preparing adequately for these potential installs will help ensure that the install is profitable and manageable.

This article is meant to provide sunMAX integrators some resources to help plan for these typically larger, more complex installs.


For an overview of additional requirements/considerations associated with a commercial or three-phase install, please see the following article here.


For a discussion of the additional costs that could be incurred when dealing with a commercial install, read this article.


To assist with permitting and system design, we have created a generic electrical block diagram to show what the three-phase sunMAX system looks like electrically. To download, click here


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