[RE-wrenches] Schneider Rapid shutdown with 2023 compliance

[Kevin Pegg]

Hi Mac,

I’ve just gone through a couple installations with a similar situation.

The hardware you list does work as intended. I had to go through three different suppliers to get all the components.

One thing that I didn’t find clear in the MPPT RS documentation is when a shutdown is initiated, it shuts _everything_ on the Xanbus network down. All devices go into standby mode. Gen shuts down if running. Power is off. Not just the PV via Tigo modules. Had to develop client instruction sheet as to how to power up after a shutdown.

On one hand, I can see why a single point shutdown is desired outcome. But it concerns me that it’s vulnerable to abuse. If the whole system shutdown is not desired, the Xanbus connection can be omitted and then RS will be limited to the PV modules only.

Kevin

From: RE-wrenches <re-wrenches-bounces at lists.re-wrenches.org> On Behalf Of Mac Lewis via RE-wrenches
Sent: January-01-24 12:00 PM
To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
Cc: Mac Lewis <maclewis1 at gmail.com>
Subject: [RE-wrenches] Schneider Rapid shutdown with 2023 compliance

Hello Wrenches,

I need to retrofit a Schneider XW+ system with a rapid shutdown system.  The owner purchased this equipment about 4-5 years ago but is trying to get it past a very intense inspector.

To me, it looks relatively straightforward to get NEC 2023 rapid shutdown compliant using Tigo TS4AF, and adding Schneider's MPPT Disconnect RS and external rapid shutdown initiator.  It's a little strange though because it has 2017 NEC compliant all over the documentation but I believe we are good through NEC 2023 because shutdown occurs at a module level and the Disconnect RS can take care of arc-fault monitoring.

Does anyone have any documentation for the MPPT Disconnect RS that doesn't specifically call out (only) NEC 2017 compliant?

Or if this is not a good approach and is not reliable, I would appreciate your input as well.

Cheers!




--



Mac Lewis

"Yo solo sé que no sé nada." -Sócrates
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