[RE-wrenches] SMA arc faults

Thu Dec 23 14:55:02 EST 2021

Mac & Wrenches -
SMA has endeavored to continuously improve the reliability and accuracy of our AFCI detection, and it is heartening to see the comments in this thread.  Recent FW update provides the option of enabling automatic restarting from AFCI in the CORE1 US-41 product.  The Sunny Boy US-41 line with most recent FW will have automatic restarts enabled. The source of multiple events should be investigated thoroughly. Registering SMA systems to the ennexOS Sunny Portal allows for remote parameter updates as well as automatic FW updates. In addition, event reports can be configured so those who should know are notified if AFCI events are logged.

Best regards -
Mike

Michael Mahon
Senior Technical Trainer, Solar Academy
SMA America
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From: RE-wrenches <re-wrenches-bounces at lists.re-wrenches.org> On Behalf Of Dave Tedeyan
Sent: Saturday, December 18, 2021 6:28 PM
To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
Subject: Re: [RE-wrenches] SMA arc faults

Hi Mac,

Might I ask what modules these are connected to? There is some history here with Sunpower modules (and possibly other high power, high voltage modules). In these cases the issue is the module. If that's the case I can provide some more detail about it.

As for remote resetting, it is actually possible. Although it takes some networking knowhow that I am not savvy enough to tell you the specifics. I believe it is possible to remotely access the inverter through some kind of port forwarding. So you can always reset the inverter by physically being there and doing the right power cycle and taps (depending on the inverter model), but you can also reset the arc fault through the computer (or smart phone) inverter interface.

There is also one other thing you can try if there is no shading. At least with the Sunpower module issue, the inverter would always trip when it does an MPPT sweep. With the optitrac global peak that the sma inverters use, they do a full MPPT sweep every 6 to 30 minutes. You can turn this off, and sometimes that will stop the arc faults. But that also means that partial shading can take out a whole string, rather than just a modules worth of voltage.

Cheers,
Dave
On Sat, Dec 18, 2021, 4:15 PM Jason Szumlanski <jason at floridasolardesigngroup.com<mailto:jason at floridasolardesigngroup.com>> wrote:
I haven't seen many, but every one I've seen has been a melted MC4 connector.

Jason Szumlanski
Florida Solar Design Group

On Sat, Dec 18, 2021, 3:21 PM Jerry Shafer <jerrysgarage01 at gmail.com<mailto:jerrysgarage01 at gmail.com>> wrote:
Over the years every SMA arcfault has been real, l am also not saying hazard, well, AC, welding, all creat Arc noise in the system and it can be from a normal contactor arc. I have also seen AM arc faults caused by defective or knock off MC connectors, in adequately stripped wires that result in the screw down connection on the insulator causing arc in the connector.
Jerry
NABCEP PV Inspestor

On Sat, Dec 18, 2021, 6:07 AM Mac Lewis <maclewis1 at gmail.com<mailto:maclewis1 at gmail.com>> wrote:
Hi Wrenches,

I have spent this last week clearing arc faults on SMA inverters.  There never appears to be a true arc event, just the occasional event and then lockout.

What is the best approach to fix these tripping inverter issues?  Is there a way to decrease the sensitivity?  Any procedures that are effective at keeping this from happening?  All connections are good and tight and triple checked.  Anyway to remotely clear these faults?

Thanks

--

Mac Lewis

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