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

[Matt Partymiller]

How quickly, after reset, do you see a new arc-fault error?  Same day?
Month later?

Have you tested string volts/amps?


On Thu, June 18, 2015 8:30 am, Howard \"Scot\" Arey wrote:
> 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 :)) 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 <mailto:scot.arey at solarcentex.com>
>
>
>
>
>
>
>
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Matthew Partymiller
Solar Energy Solutions LLC
(877) 312-7456
matt at solar-energy-solutions.com