Could be worse, last December was only 8.6% of my May 23 output. 93kWh vs 1083kWh.
Also E/W but at a very low angle so the winter is really bad for me with current setup.
E/W 8.4kw even split.
205kwh for the month
Just to rub in in Mick I averaged 12 kWh/day for November on my 6.1 kWp system...😎 360 kWh in total and had 6 days at 20 kWh or more. It was a pretty good month here
163kwh here from 4kwp south east, 3kwp north west
202kwh from my 4.8kwp South facing not too bad
189kwh here in Meath southish facing. First 12 days of the month with 4.3kwp system but extra panels added on 13th bringing it up to 6.45kwp.
21.7 kwh here today. Nice finish to November!
330kWh from 11.6kW se/sw array
6.5kwp in South Dublin city. I really miss those days of it pumping out 4Kw+ for hours on end. <sniff>
398kWh for November from 8.3kWp South facing array. Lovely clear sky today gave me 25kWh and I was home to capitalize !
Sun hog🤣
Wow - 0.7Kwhr forecasted for today (Monday 4th) - winter really is here. :-(
Very impressive graph. Do you mind me asking how you generate it? I use the Solcast api toolkit app to forecast the likely generation for the following day but the nowcast varies dramatically at times. Out of interest I would like to compare forecast to actual over an extended period but at present have no means to do so
There's a good few messages over in the "automation" thread, but in a nutshell Met Eireann have an API and you can call it with your latt/long and it will return an XML file. For me in south Dublin that's http://metwdb-openaccess.ichec.ie/metno-wdb2ts/locationforecast?lat=53.27;long=-6.32
It'll return a bunch of hourly reports such as tomorrow.... at 11am to 12pm (aside: I think that's a bug in the xml below for the end time it should be 12)
<time datatype="forecast" from="2023-12-05T11:00:00Z" to="2023-12-05T11:00:00Z"> <location altitude="163" latitude="53.2700" longitude="-6.3200"> <temperature id="TTT" unit="celsius" value="1.6"/> <windDirection id="dd" deg="263.7" name="W"/> <windSpeed id="ff" mps="2.4" beaufort="2" name="Svak vind"/> <windGust id="ff_gust" mps="5.3"/> <globalRadiation value="71.4" unit="W/m^2"/> <humidity value="92.4" unit="percent"/> <pressure id="pr" unit="hPa" value="1015.0"/> <cloudiness id="NN" percent="55.1"/> <lowClouds id="LOW" percent="55.1"/> <mediumClouds id="MEDIUM" percent="0.0"/> <highClouds id="HIGH" percent="0.0"/> <dewpointTemperature id="TD" unit="celsius" value="0.3"/> </location> </time>
The interesting bit above is the "globalRadiation" value of 71.4 for 11am->12pm. So I sum all the hourly globalradiation values up for tomorrow, I'll get a total "daily radiation" value of like 508 (or something). So now I know what tomorrows radiation value is.
I also have my historical "actual" kwhr value for my system in a database, so I can compute an average over say the last 10 days, that 1000 "radiation" will generate "x" kwhr and from that I can compute an estimate for today/tomorrow.
It's not perfect. Ultimately if the forecast from Met Eireann is garbage, then I'll get garbage forecast.....but to be fair to them, they do a good job on most days which as you can see equates to pretty decent forecasts.
Today my estimate was for 0.7kWhr and I ended up with 0.5kwhr. That's close enough to be fair.
I've used Solcast, and on clear sky days.....it's pretty good, but on days which are changeable it's all over the place.
Thanks for the information. Looks interesting. ll have a look and see what the score is. Agree on the solcast api. Interesting to watch it update as day progresses, there can be mad swings between forecast and actual.
12.2 today in Tullamore.
Mad - that even looks like a "blue skies" curve and your only <100Km away.
Yeah. I was in Dublin all day myself yesterday. And we have a 28 panel system on the office roof and it only generated 2kwh.
25kwh Generated yesterday followed up by 18kwh today in galway. Cracking for December but more normal returns expected for next few days
Don't think I've seen the forecast this low...
Next few days aren't great for me but picks up again on Saturday
Well today was the single worst day I've ever had for PV. Based in Cork. 3.3kW inverter, peak of probably about 5.5kW from 12 panels in the summer.
Yield for today = 0.00kWh. It was tragic. Overcast, thick cloud, mist and rain. Never have I seen the likes of it.
from 20kwh on Nov.30 to a new low of 0.3kwh today 😂
Worst day ever for my setup. Granted there was a power outage 9=6pm so my roof panels were offline but still shocking return from ground mount system.
On plus side changeover switch allowed power to whole house all day uninterrupted
140 kW for November for me.
6.6 kWp installed with an east / west split.
Not great, but it it what it is 😕
0.9kWh yesterday from a 6.8kW array
See ye in six weeks.
We should just rename the thread to 'see you in Feb'. Or better still, Paddy's Day when we're all flying it again :)
yeah id say im averaging 2kwh these days.. what id forgotten is even on a really sunny day... my peak kwp is only about 1/3rd of the summer equivalent.. ive seen 1kwh at times.. even 1.9... this week but in the summer that would be 5
turns out the forecast was optimistic with just 0.5kWh generated
Had a quote from a seller who claimed a 2.9kwp system (7 panels) could achieve 3,000kwh a year off an average year of 1,000 hours of sunlight. Roof is south facing with a pitch of 40 degrees. He said the panels they install are double sided so give an extra 10% of generation from the underside of them. Is 3,000kw hours a year realistic from such a small 2.9kwp system? Or is the salesman using optimistic figures?
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