[RE-wrenches] SolarEdge inverter blowing fuses

[Lloyd Hoffstatter]

Dave,

My first thought would be a small nick in wire insulation going to ground, causing the fuse to fail over time.
We had a similar situation with a much larger system where the culprit was hard to notice…

Best regards,
Lloyd

Lloyd Hoffstatter
Sunstruck Consulting

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From: Dave Tedeyan<mailto:dave at sungineersolar.com>
Sent: Monday, November 1, 2021 4:26 PM
To: RE-wrenches<mailto:re-wrenches at lists.re-wrenches.org>
Subject: [RE-wrenches] SolarEdge inverter blowing fuses

Hi All,

I am servicing a system that keeps blowing fuses on the AC side, although it
 appears that everything is sized correctly. It is a SolarEdge SE11400A-US inverter.
 Max continuous output current is 47.5A x 1.25 = 59.4A. There is a GE TG3222R
 60A AC disconnect, and it is wired up with #6 THHN wire. The terminals were tight
 and there was no evidence of arcing or burning in the past. This is indoors, and not
 exposed to sunlight. No extra conductors are in the conduit.

But they say that they need to replace a fuse roughly once per month. Has anyone
 seen this before? Could there be some kind of fault in the inverter itself that
 occasionally induces extra current? Is there any way to tweak the settings so that it
 actually produces a bit more than 11.4kw? I appreciate your thoughts.

Cheers,
Dave

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