Renewables: "talking 'bout my generation"

onomatopoeia99

A cloudy 2.1 O today

Merlin139

The trend continues.

4.09 O's

1961Nick

Oscargrouch wrote: »

Not a great day..:(...3.72 O's...:cool:...

I beg to differ...

2.8 O's

JKenH

1961Nick wrote: »

I beg to differ...

2.8 O's

That beat my east roof which only managed 2.5 Os.

1961Nick

JKenH wrote: »

That beat my east roof which only managed 2.5 Os.

Just reached the 442 kWh I needed for May’s PVGIS

Coastalwatch

Been away for the weekend and find the following recorded from Friday. 6.4, 4.6 & 3.6 O's.

Today is looking iffy so will probably struggle to match even the lowest of those come the close. Currently 3% ahead of pvgis but will probably slip back by close today.

onomatopoeia99

4.2 O so far today and I'm past PVGIS for the month. It's still generating a little bit, but I won't be able to get another reading until Thursday.

JKenH

1961Nick wrote: »

Just reached the 442 kWh I needed for May’s PVGIS

As of last night I was still 179 kwh (23 Os) short of PVGIS total for May. Given that we are only 6 or 7 miles from each other as the crow flies and therefore have very similar weather I don’t have a great deal of confidence in the PVGIS calculations for varying panel orientations.

To achieve May target you need 110.5 Os and I need 111. That doesn’t seem right as your roof is SSE(30* pitch) and mine are ENE and WSW (both 39* pitch).

Or maybe I have just done my PVGIS calcs incorrectly which of course is quite possible. (I will check them again later).

I would be interested to hear what the May target (expressed in Os) is for others with east/west roofs.

1961Nick

JKenH wrote: »

As of last night I was still 179 kwh (23 Os) short of PVGIS total for May. Given that we are only 6 or 7 miles from each other as the crow flies and therefore have very similar weather I don’t have a great deal of confidence in the PVGIS calculations for varying panel orientations.

To achieve May target you need 110.5 Os and I need 111. That doesn’t seem right as your roof is SSE(30* pitch) and mine are ENE and WSW (both 39* pitch).

Or maybe I have just done my PVGIS calcs incorrectly which of course is quite possible. (I will check them again later).

I would be interested to hear what the May target (expressed in Os) is for others with east/west roofs.

I can imagine how your orientation, especially the ENE, could cause a large discrepancy with PVGIS. A series of misty mornings would render that array unproductive. My SSE is likely to be a lot more predictable as it's not at the mercy of that early morning period.

JKenH

Hi Nick, it’s not the performance of my panels that concerns me, rather the fact that PVGIS predicts a higher target (in terms of Os) for my east/west roof than for a roof much closer to south.i.e it is suggesting my roof will be more efficient than yours.

On 24th May I had a near perfect day yet only logged 5.81 Os while a gentleman 100 metres away logged 7.3 Os with a roof that is orientated 90* to mine.

Edit: Month to date average efficiency for the near neighbour’s and my own systems works out at 4.49 and 3.37 Os respectively. If those figures were extrapolated, monthly totals would be 139 and 104 Os. My neighbours orientation is similar to Nick’s so that would put him 25% ahead of PVGIS while I would be 5% behind. That can’t be right for two houses almost next door.