Renewables: "talking 'bout my generation"

Martyn1981

OK end of March. Shall I go first to make everyone else feel better?

System: 3.58kWp

Total generation: 264kWh

Generation per kWp: 73.74kWh

Go on then wheel out the big guns!

Mart.

GaryMo_2

Hardly a big gun but a great month for generation, especially the latter end.
PVGIS estimated figures for March were 262kWh, my generation figures ended up at 385kWh so much higher than anticipated at 147%

My system on PVOutput

Record day was 26th March with 23.47kWh
Worst day was 9th March with 1.8kWh
Average for March is 12.423kWh
Generation per kWp - 96.25kWh

sly_dog_jonah

seagull09 wrote: »

Indeed it does:

(light green is Today, dark green was Thursday - MSE auto-resize makes the image a bit small)

What happened at 11:00am on Thursday? The steep rise? Cloud/mist burning off? Or is that when some physical shading ends?

EricMears

Well I haven't been able to report the bumper individual days others have - my best was 20.77kwh on the 27th - but monthly total is fairly respectable :-
From SB logs
01/03/2012 00:00 1248.575
31/03/2012 19:25 1617.29
March Gen 368.7kwh
(92kwh per installed kwp)
I don't actually remember seeing the sun at all today but still managed 5.28kwh.
Roll on April May, June & July - every one of them ought to be better than March and of course my shallow slope gets less of a handicap.

Cashwise, my £12k left in the ISA would have earned £420 in a full year or around £35 per month. March (containing an equinox day) should be an average month but I seem to have earned over £160 (getting on for 5 times as much).

KevinG

Martyn1981 wrote: »

OK end of March. Shall I go first to make everyone else feel better?

System: 3.58kWp

Total generation: 264kWh

Generation per kWp: 73.74kWh

Go on then wheel out the big guns!

Mart.

Mine works out as 101.52 kWh/kWP for March.

Here I am on pvoutput.

sly_dog_jonah

I see a very similar kink in our graph in the afternoon when the whole pv array is shaded by the sun moving westward.

How did your output compare to PVGIS? I guess PVGIS can't account for shading, so it would be interesting to see how it compares?

I'll be uploading my stats tomorrow evening, but I know we'd beaten PVGIS by 25% as of Wednesday lunchtime.:j

EricMears

Certainly has been for us !

I've just looked at all my (7.5) months outputs. To break even with leaving our £12k in an ISA, we need to earn £35 per month which was (until this morning) 78kwh / month.

The only month so far in which we didn't do that was December - and even that was 77.8 so we weren't really much out of pocket even then (9 pence ! )

Actual monthly results were :-
. . . . . . . . . . . . . . . . . . . . . . . . pvgis
Aug (15 days) 184 . . . . . . . . . . .390 (full month)
Sep 347 . . . . . . . . . . .. . . . . . . .296
Oct 262 . . . . . . . . . . . . . . . . . . . 195
Nov 100 . . . . . . . . . . . . . . . . . . . 100
Dec 77 . . . . . . . . . . . . . . . . . . . . 63.5
Jan 107 . . . . . . . . . . . . . . . . . . . 91.5
Feb 170 . . . . . . . . . . . . . . . . . . 149
Mar 363 . . . . . . .. . . . . . . . . . . . 250



excluding Aug :-

Month . Act . . Pred . %inc rel to pred
Sep . . 347 . . 296 . . 17.23
Oct . . 262 . . 195 . . 34.36
Nov . . 100 . . 100 . . 0.00
Dec . . 77 . . 63.5 . . 21.26
Jan . . 107 . . 91.5 . . 16.94
Feb . . 170 . . 149 . . 14.09
Mar . . 363 . . 250 . . 45.20

Year . . 1426 . .1145 . . 24.54

KenS

System: 3.50kWp

Total generation for March: 347kWh

Generation per kWp: 99.20kWh

sly_dog_jonah

March was a corker here in cider country. PVGIS estimate was 244kWh and we generated 365.1kWh, so 50% above estimate. That equates to 98.7kWh/kWp.

This was despite a rubbish week in the middle where we barely saw the sun for 5 days and only made 17kWh in that period. The last 2 weeks more than made up for it, we only had 2 days in the that period when we didn't break into double figures (and one of those was a 9.9kWh). We set 4 new records during the course of the month.

Until March we were running about 25% ahead of PVGIS. I need to crunch the numbers tomorrow to see how we're doing taking March into account.

April started off today with a new record at 22.155kWh which at the old FIT rates would have been just under £10, but with the uprating it was our first £10+ day at £10.39 (rounding down to 22.1kWh).

Kernel_Sanders

seagull09 wrote: »

I expect if it was possible to get a nice cold breeze and a cloudless sky at this time of year, records would be broken.

This would be more likely in late June, although it depends on your proximity to due south and your pitch. Cold days are not unheard of at that time; remember that day in early August? (Max 12°C in Mansfield!)

KevinG wrote: »

completely smashed any period in the whole of last summer and now exceeded March PVGIS by 53%. :j

This demonstrates just what an incredibly unusual March fortnight we have just enjoyed.



Saturday's dismal performance was actually quadrupled on Sunday, giving me an unexpected record of 22.08 kWh.