Do I really need a rapid shut down?

[SHTF Power Anyway]

I was planning on installing a 10 kwh system on a barn with a metal roof with an underground feed to a nearby shop for use off-grid. I was told by one installer that I didn't need permits. I was sold a full system without discussion of any rapid shutdown necessities. I spoke with another installer who said it was required on any roof. I'm confused. I do not want to add to the complexity of our build but do not want to be unsafe. Thoughts? I'm in Washington state if that helps. If I need it, what systems do you recommend and why?

 

[sunshine_eggo]

If your local code requires compliance to NEC2017 or later, you need rapid shutdown on roof mounted panels. That typically involves an optimizer with this feature on each panel. These are ~$60 per panel.

You will need to check with your city or county for specifics.

 

[SHTF Power Anyway]

Thanks for the reply. Bummer.