Did you mean "... would be if they were optimally loaded? ..." or "... woul=
d
be if they were optimally illuminated?..."

I have considered the question of series string performance when one panel
is not as optimally illuminated as the others but never in parallel.

Assuming I have understood the question

Q1 Off the cuff ... The less optimally illuminated

at 100% will deliver 1/2 or 50% the total power

at 80% will deliver perhaps 5%

at 50% will be seen as a load by the other panel and become a hindrance and
will deliver -10%

Q2 Very hard for me to separate because before off the cuff in the before
time I would still consider the question.

I am very curious and will now read the answer

Justin


On 28 April 2016 at 08:31, RussellMc <apptechnz@gmail.com> wrote:

> To: Whoever wants to comment.
>
> Answer to at least 1. and 2. would be interesting.
>
> ______________
>
>
> Q: If you had PV panels which *each were evenly illuminated *but the
> illumination level of each varied (eg 100%, 80%, 50% of 1 sun) and you
> placed them in parallel, what would you expect the output of the low ligh=
t
> panels to be compared to what it would be if they were optimally loaded?
> This could happen with eg panels pointing at different sky areas.
>
> Note that, within one panel,  no cells are shaded more than any other - i=
e
> all series strings have ~ equally illuminated strings. Only whole panels
> have differing illumination levels.
>
> Assume to make it 1/2 answerable that  the fully illuminated panel is
> working at its max power point so Vout suits it perfectly and other panel=
s
> are added and the voltage does not change.
> (This could happen with eg a stiff battery load or an inverter input with
> feedback control etc). The arrangement is artificial but does not overly
> change the answer , probably.
>
> Assume panels behave like this. This is not meant to set specific V or I
> curves but to just show general shape.
> Lines are for insolation (sun energy) decreasing in 5% steps from top
> (100%, 95%, 90% ...)
> Blue dots are maximum power points at that insolation level.
>
> [image: Inline images 1]
> Questions:
>
> For question marked Q: at top of page:
>
> 1. What you would have said off the cuff before I asked the question.
>
> 2. What you would say off the cuff now I have asked the question.
>
> Only if excessively keen:
>
> 3. What you would say after having done some figuring.
> Here is my lonnnnnnnng answer (with summary at start).
> Don't look at it until you have answered 1. & 2. above (if then).
>
>
>          http://electronics.stackexchange.com/a/230889/3288
>
>
>      Russell
>
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