PV orientation [RE-wrenches]

[Joel Davidson]

Are you all putting in these different oriented sub-arrays and parallel strings
with string blocking diodes?

Bill Brooks wrote:

> William,
>
> Once the operating voltage is set by the dominant portion of the array, the
> parallel strings still have a max power voltage that is nearly identical to
> the array in full sun. It may seem counter-intuitive, but temperature
> changes voltage, not irradiance (accept at very low irradiance).
>
> The critical issue is that all the modules in a series string are in the
> same orientation since the operating current needs to match exactly.
> Parallel strings can be in different orientations with little negative
> affect on performance since the operating voltage of each string is nearly
> identical.
>
> Bill.

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