[RE-wrenches] Repetitive and unknown arc-fault codes with this combination...Sunpreme bi-facial and Fronius IG

[Jerry Shafer]

We had an installation with 3, 7 let SMA's we did the same checks you did.
We found a AC contactor that was causing the problem, SMA agrees that this
can happen. Just a thought
Jerry
On Jun 18, 2015 4:31 AM, "Glenn Burt" <glenn.burt at glbcc.com> wrote:

> Have you performed insulation resistance tests on the DC conductors
> (megger)?
>
> Sincerely,
> Glenn Burt
> Sent from my 'smart' phone so please excuse grammar and typos.
> ------------------------------
> From: Howard  Scot  Arey <scot.arey at solarcentex.com>
> Sent: ‎6/‎18/‎2015 8:30
> To: re-wrenches at lists.re-wrenches.org
> Subject: [RE-wrenches] Repetitive and unknown arc-fault codes with this
> combination...Sunpreme bi-facial and Fronius IG
>
> I need some help please!  I’m quickly losing credibility with two of my
> customers.
>
>
>
> We have two installations with Sunpreme GxB 350 bi-facial modules and
> Fronius IG inverters.  They keep throwing Error code 240 – arc fault on the
> Fronius IG.
>
>
>
> We’ve been up and down these installation three times checking
> connections, replacing connectors, tightening connections, checking for
> chafed wires.  Nothing to cause any visible angst.
>
>
>
> The team here is wondering is perhaps the module itself might be the
> source of the problem, with some DC arcing inside the J-Box.  Any
> thoughts?  We can’t open the j-box on an broken module (be careful handling
> frameless glass on glass modules J) because there doesn’t appear to
> anything accessible with modern potted j-boxes.
>
>
>
> As for the conditions when we get these arc fault codes – typically the
> peak of a sunny day when they’re making max power.
>
>
>
> Each of the installations is a bit different. On the 7KW install with
> Fronius 7.5, we’ve run the two strings (10 modules each) back to the
> inverter separately.  On the 10.5KW install with the Fronius 10.0, we ran 3
> strings of 10 to a combiner box, then one set of conductor back to the
> Fronius 10.0 where we used the distribution plate to spead the amperage
> across the six string input channels.
>
>
>
> I’m stuck – any thoughts on other potential arc-fault causes?
>
>
>
> *Howard “Scot” Arey*
>
> 254-300-1228
>
> scot.arey at solarcentex.com
>
>
>
> [image: logo from letterhead]
>
>
>
> [The entire original message is not included.]
>
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