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Roof-mounted solar panels - hidden danger

Post in 'The Green Room' started by Joful, Sep 5, 2013.

  1. Joful

    Joful Minister of Fire

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  2. pen

    pen There are some who call me...mod. Staff Member

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    Hmm. Who would have thought that more stuff on the roof would make things more difficult :oops:

    What's your take? What should be done?
  3. woodgeek

    woodgeek Minister of Fire

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    training issue?
  4. Where2

    Where2 Member

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    I loved this statement: "any kind of light at all will activate the panels, including streetlights, floodlights, even firefighters’ flashlights. Those panels are extremely efficient."

    Best I've seen is about 15% efficient. Partial shading really screws up a panel output too.

    Since I have a stack of 235W monocrystalline panels, I ran a little experiment tonight. I took a 5-cell Ni-Cd Mag Lite similar to those used by your average FD/PD, shined it on a panel. I measured 10.6v @ 0.01A. So, I turned on a 50W lamp mounted an average of 7 feet from the panel. I measured 16.2v @ 0.02A.

    Sounds like a training issue. One swing with your average fire fighting axe will disable a solar panel even at high noon.
  5. peakbagger

    peakbagger Minister of Fire

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    There definitely is a training issue and current NFPA standards require access ways on each edge of the roof as well as along the ridge pole for peaked roofs. Many folks dislike this as it reduces the number of panels they can put on the roof.

    Microinverter based systems are somewhat safer as if the AC power is turned off in the structure the inverters shut down. The panels themselves are still "hot" but the wiring to the microinverter is typically under the panel and very short.
  6. TradEddie

    TradEddie Minister of Fire

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