Solar power calculations, please help!

On Wednesday, 22 July 2015 04:40:54 UTC+1, John Rumm wrote:

I had no idea about that bit!
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Why don't you read up about them?
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On Monday, 27 July 2015 23:08:11 UTC+1, Tim Streater wrote:

I will do one day.
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On Monday, 27 July 2015 23:08:11 UTC+1, Tim Streater wrote:

Although, even then It's likely I'd have been here asking if the 1 kW insolation figure is the 10% efficiency value, or PV panels are only 10% efficient from the 1 kW value!
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Tony Sayer



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On Sunday, 19 July 2015 21:54:11 UTC+1, tony sayer wrote:

It's a pole transformer, 25Kva ISTR The issue is not the transprmers' capacity, it's the rise in local voltage caused when the panels are at full output and nobody locally is using any electricity. Made worse by other people nearby having PV as well (not on same transformer)
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harry wrote:

Putting the lie to your previous statements that solar power reduces load on the grid as it's consumed locally?
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On 20/07/2015 07:15, harry wrote:

That's not a problem the inverter will shut off if it goes over voltage, you just won't earn as much cash. Buy some storage or move your panels so they aren't all South facing.
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wrote:

http://www.abc.net.au/news/2015-07-20/mitsubishi-apologises-using-us-pows-as-slave-labour/6633880

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On Wed, 15 Jul 2015 06:27:49 -0700 (PDT), David Paste

Returning to the original post, I took another look at the numbers the OP put up, based on the results from Chris Dixon and Harry.
50,000 panels and 40 MW output. Assume the latter to be peak output, then each panel has a Wp of 800 (40,000,000 /50,000)! That's some output, bearing in mind that even CD's panels, at 1.8m^2, only have a Wp of 260. I suppose it depends on how big their panels are; probably bigger than those for domestic roof installations. To get a panel with a Wp of 800 would need a panel size of something like 2m x 3m, at Wp/m^2 values of say 133 (a not untypical value).
But assuming that's OK, that the 40MW is peak power and they use super-sized panels, how much power might they be expected to supply *on average*? Harry's panels give peak power per m^2 of ~134Wp/m^2 (185/1.383), while CD's give 144Wp/m^2 (260/1.8). *Actual* average powers are 15.7 and 15.9W/m^2 *(see end of this thread for discussion between Harry and myself), i.e. 11.7% and 11.0% of Wp, respectively, say a mean of ~11.5%.
So realistically, that 40MWp becomes something around 4.5-5MW average, perhaps a little more depending on the type of silicon used on the panels (poly- vs. mono-crystalline).
The renewable lobby does like to present it's case in deceptively optimistic terms, hoping that the sheeple will take it at face value, which they almost always do :-(
I don't know where one draws the line between being optimistic with the truth and bare-faced lying, but I reckon they get pretty close at times.
(E&O? Blame Bacchus!)
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Chris

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On 20/07/15 15:33, Chris Hogg wrote:

Worse, we cant cope with 40GW of midday summer sun power without switching off all our reactors and fossil power stations, running every interconnector backwards to export the surplus, and throwing 10GW away.
Lets stop at the unholy mess 40MW causes us before adding a single new solar panel.

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On Monday, 20 July 2015 18:16:25 UTC+1, The Natural Philosopher wrote:

Coal and nuclear need to be shut down permanently in the near future. Only gas fired power stations are acceptable.
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wrote:

Taint gunna happen, you watch.

Even sillier than you usually manage.
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Christ!, are you expecting serious responses to statements like that one?.
So shut them down and where is the power lost coming from?.
Answer do like the Germans are doing, import some from Nuclear powered France and so are others.
What's the cost of another 2 G/Watt interconnector cable to France I wonder;?.
A virtual nuke that is;)..
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And Denmark

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bert

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On 21/07/2015 06:51, harry wrote:

You haven't found a way to store your renewable energy yet?
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On Tuesday, 21 July 2015 11:45:22 UTC+1, dennis @ home wrote:

It's in the pipeline shit-fer-brains. EG:- http://www.nature.com/nature/journal/v505/n7482/full/nature12909.html
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I notice the paper was submitted two years ago. Commercially available, installed, and able to run the grid for days yet harry?
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So is the large hadron collider

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bert

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On Monday, 20 July 2015 18:16:25 UTC+1, The Natural Philosopher wrote:

Full of crap as usual. It has been up and running since March with no problems. I see you've changed from Solar PV will never do enough to it's doing too much! Brain dead.
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