[RE-wrenches] calculating low string voltage

[Scott McCalmont]

Usually you increase the temperature above ambient by an amount which depends on the mounting method. Close to the roof is +35 degrees C, more than 6 inches above the roof is +30 degrees C, and pole or ground mount is +25 degrees C.

Scott

On Nov 29, 2011, at 11:48 AM, Kirk Herander wrote:

> I am in debate with a PE over calculation of low voltage of a series string on a hot day. He insists that an arbitrary high cell temp is factored in, not just ambient temperature. Could someone please give an accepted formula for this calculation? Thanks. I cannot find a clear reference to low voltage calculation on a hot day (but every reference material is clear on how to calculate high voltage on a cold day).
>  
> Kirk Herander
> VT Solar, LLC
> dba Vermont Solar Engineering
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