Chart for impact of space between panels and roof [RE-wrenches]
Steve Johnson
stevejohnson at comcast.net
Sun May 18 20:13:24 PDT 2008
Thanks, Michael. this helps - I'll try Bill's chart too.
Steve
Michael Welch wrote:
>
> Hi Steve. Home Power just published an article that includes similar
> info.
>
> For string sizing purposes, these correction temperatures are intended
> to be added to the highest average ambient temperature at the array's
> location.
> Parallel to roof (<6 in. standoff): +35°C
> Rack-type mount (>6 in. standoff): +30°C
> Top-of-pole mount: +25°C
>
> The article also goes into detail about what temperature figures mean
> for array voltage and power.
>
> Steve Johnson wrote at 12:17 PM 5/16/2008:
>
> >Yes I'm aware of that but I'm referring to a study with a chart that
> >shows performance dergradation relative to distance from roof. Like at
> >1", 2", 3" 4", 5",6".
> >
> >Since I already know what to do why do I need this? One word.
> >"Customer"
> >
> >This is a highly monitored job with temperature sensors etc.
>
Steve Johnson
LightWave Solar Electric
Nashville, Tennessee
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