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

Glenn Burt glenn.burt at glbcc.com
Thu Jun 18 07:31:26 PDT 2015


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.

-----Original Message-----
From: "Howard  Scot  Arey" <scot.arey at solarcentex.com>
Sent: ‎6/‎18/‎2015 8:30
To: "re-wrenches at lists.re-wrenches.org" <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 :)) 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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