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Frodo

New Infinisolar Super 4k Error 12

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Hi,

We installed a new Infinisolar Super 4k.

epIt was running fine for about a week, but then Today at around 13h tripped and reported Error 12.

Reset it, and it was runnng fine, although picked up PV input slowly.

Any ideas what could have caused it and possible solutions?

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Manual says "leakage current":

image.png.79d3a6110c1e1b6b50369b2ca6ecc648.png

http://www.fullcirclesolar.co.za/wp-content/uploads/2017/05/FCS-InfiniSolar-Super-4KW-manual.pdf

It's related to the DC side - PV modules and wiring. Normally, this error shows up when you have one of the poles (negative or positive) of the solar array grounded. Infini is not galvanically isolated, thus there must be no grounding of negative, nor positive pole. Grounding negative pole of the solar array is someting what's done when amorphous panels are used. They need negative pole grounding in order to protect them from PID degradation.

Check the impedance of negative/positive pole of the solar array against earth. There might be a shunt or faulty solar module.

 

 

 

 

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Hi,

All cabling checked twice, and the panel's frame earthing amended.   Also tested all panels and can't pick-up anything abnormal.

Still getting the Error 12 every now and then, sometimes it remains in Error 12 state for the rest of the day, sometimes it can be reset?

Any ideas would be appreciated?

 

Thanks!

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3 hours ago, Frodo said:

Also tested all panels and can't pick-up anything abnormal.

Does that include checking for leakage from positive and negative PV wires to frame?

With multimeter or megger?

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22 minutes ago, Frodo said:

We tested with a multimeter.

I think that's not good enough for panels; there could be a leakage to frame anywhere in the 60-72 cells, and away from the terminals, you have a set of (light sensitive) diodes in series. The ~3 V of the multimeter would only forward bias half a dozen cells, so you won't "see" beyond nearest dozen.

I assume you at least tested in both directions (polarity of multimeter leads) for both ends of each panel.

29 minutes ago, Frodo said:

What can cause a leakage to the frame?

I have no idea of the cause; my panels are all ELV, so I don't even bother earthing the frames. I guess it has to be moisture ingress. Can you perhaps see any cracks in the glass. perhaps from hail?

 

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Hi,

No, there is no visible damage or moisture visible on visual inspection of the panels.

Thanks,

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I've seen spurious Error 12's on the Infini 4K. Try a firmware update (You'll need to ask your original equipment supplier), it's worked for me a couple of times.

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