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Joined: Jun 2004
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Greg: This is the combiner box closest to the assumed point of origin of the fire. No definitive cause or location was available as of this afternoon. That appears to be a nonmetalic combiner box with EMT. Were bonding jumpers installed? shortcircuit
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Joined: Apr 2004
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That appears to be a nonmetalic combiner box with EMT. Were bonding jumpers installed?
shortcircuit Looks like PVC to me, I see the barcode on the bottom-most conduit.
Is there anyone on board who knows how to fly a plane?
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Joined: Feb 2002
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John,
Yes please keep us informed. I would like to see the outcome of this problem was. I am still on the fence about the safety of this things.
I know I would prefer the PV systems that have the mini inverter on each PV panel. This way the DC current stops right there on the roof.
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Shortcircuit: Thanks for the links!!! Appreciate it!!!
Combiner boxes are metalic, 3R, etc. conduit is PVC with grd conductor.
Documentation is being compiled on my end.
John
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Here is another angle pic.
John
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Joined: Jun 2004
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That looks like a Solectria combiner box.
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Joined: Apr 2002
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As of Fri. there has been no root cause determined. The area of the roof has been set into a grid, the remains being tagged and boxed and removed from the roof. The remains will be reviewed further to see if a cause can be determined.
John
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Joined: Jul 2004
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Assuming a number of the collector pans look like this.
I guess the first question I have is what happens to those collectors if they feed a bolted fault. Is there collector level over current protection? You might be looking at a symptom there and you had a bigger problem on the load side.
Greg Fretwell
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Greg: The combiner boxes like these are 16 circuit, finger safe fuses (midget). I'll venture a guess at 100K minimum for the fuses. I'll get the rest of the specs tommorrow.
John
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