If the Applicant was named on the permit and inspection document(s), typically no additional documentation is needed.
If the Applicant was not named on the permit and inspection document(s), they must submit a letter documenting their role and decision-making autority they had related to each installation for the system design, project management, installation, and/or commissioning/quality assurance process.
This physically signed letter on company letterhead must be from either
Here is a template that you can customize for your NABCEP documentation.