Solar PV Performance Thread - Post your monthly output

KingCong

Has October been brutal for others so far? Nearly half way through the month and have only generated 146kwh, nothing but cloudy dull days with no sun. For context I've 9.68 KW of panels facing due south & generated over 3000kwh from July 1st to the end of September.

graememk

https://www.boards.ie/discussion/comment/123902203#Comment_123902203

"Winter is coming"

October is the last month of autumn (Deireadh Fómhair, end of harvest) in the Celtic calendar and it's tracks too for the last month of autumn in the PV generation too (length of day)

Would be comparable to February in length of day, but usually a bit warmer.

magicbastarder

https://www.boards.ie/discussion/comment/123902203#Comment_123902203

currently at 133kWh from a 7.9kW installation.

KingCong

https://www.boards.ie/discussion/comment/123902230#Comment_123902230

Yeah I was expecting a bit more for October though, big drop from 850kwh in Sept. First year with solar so I've been using OpenSolar models as a rough guide of what level of generation to expect each month. So far it's under shot the actual generation since July by about 10 - 15% per month but this month's generation is trending to be well below OpenSolar's predication of 530kwh. I guess these models are built on averages though and the weather here in the West has been even more dull and cloudy so far this month than the average October.

graememk

https://www.boards.ie/discussion/comment/123902380#Comment_123902380

How does it compare to the EU model

https://re.jrc.ec.europa.eu/pvg_tools/en/#PVP

We've found that too be quite accurate (and usually on the pessimistic side.

curioustony

First 12 days of Oct '25 vs '24 (right).

I added 60% more panels between the two. Very bad start to the month this year

Aquos76

https://www.boards.ie/discussion/comment/123902203#Comment_123902203

Ive an 8.9KW system made up of 10 east and 10 west, only have system running since middle of sept is all, but so far for Oct Im at 153kwh, and for the 16 days in sept I generated 396kwh.

padraig.od

Down 40% on last October here

Sponsorgate

9.8kwp. 12 west & 10 east

180kwh for October currently

discostu1

TThough It was just me 😃

Cloud cloud and rain next week

ted1

Oonly 131 kWh so far this month. Fairly disappointing

keno-daytrader

102 kWh so far, forecast to generate 400 kWh for Oct, but Ill be lucky if we produce half that at this rate.

Aquos76

https://www.boards.ie/discussion/comment/123903430#Comment_123903430

Up to 163 now, 10kWh over the last 2 days is all, and literally nothing given back to grid as its only keeping my battery topped up during the day is all

Soarer

167kWh here. Stupid bland weather.

bobburns007

Yes, October is poor compared to 2023 and 2024, but on the whole 2025 is shaping up to the better than last year, I’m already at last years total PV generation with 2 months to go.

GhostInTheRuins

203kwhs for October.

Also just passed the one year mark of having the solar, 4,500 kWhs for the year which is more than PVGIS predicted. It’s covered almost all my electricity and gas bills for the year so I’m quite happy with it.

4.45 kwp south/south east

Sponsorgate

9.79kwp east/west split. West Cork.

405 kwh for October. Installed in August so no previous data to compare.

bullit_dodger

Poor october to be fair. 6.5Kwp in E/W South Dublin city.

Only 82% of PVGIS, but as one of the other posters noted, I've already broken my all time yearly total and I've still 2 months to go, so 2025 is very good year!

My shed (2.3Kwp due south) chipped in with 85Kwh, so a total of 276kwh off 8.8Kwp in total.

Now come the 3 bad months of Nov → Jan. <sigh>

SD_DRACULA

Nasty October this time around by a lot, 480kwh vs 600kwh last year

ted1

disappointing month. Just 263.6 kWh only 8 days had over 10 kWh.

PVSol forecasted 380 kWh

6.3 kW system in south Dublin

magicbastarder

275kWh off a 7.9kW system. Dublin Northside.

curioustony

Meh month.

2025 YT Nov 5895.0 kWh

2024 YT Nov 3678.0 (5884 adjusted for added panels)

The early winter closes the gap for my usage pattern in terms of supplier. Using credit till spring.

I'll need to get an LLM to scrape the updated costs this coming month. I added a JSON schema for the price plans so that works quite well.

MacDanger

Down ~20% vs last year, 220 vs 270

Aquos76

8.9kWp spread East/West, Waterford City, total yield for Oct 330 kWh, only have system installed since 9th Sept this year so no previous data for comparisons, I am at 730kWh for the year though.

rgfuller

48th Month

Dublin - Lucan - October 25 - 7.12kW installed (S: 3.45kW, E: 2.41kW, W: 1.38kW). E&W Optimised. 5KWh Battery, (30 S & 22.5 E/W degree pitch).

Total Generation: 242kWh (205kWh self use (inc. battery), 37kWh to grid)

Best Day: Oct 6th - 18.5kWh

Worst Day: Oct 18th - 1.3kWh

Total Consumption: 450kWh (44% Solar: 56% Grid Import (250kWh))

Milestones & Info:

Oct 2024 :: Generation 355kWh, Consumption 407kWh
Oct 2023 :: Generation 308kWh, Consumption 507kWh
Oct 2022 :: Generation 323kWh, Consumption 489kWh

33kWh to Eddi for Oct. Passed 22MWh since install (4 Years Ago).
4 Years deployed giving approx €5500 saved incl. CEG payments equalling a return so far of 57% on cost of system (*excluding 2340 kWh of hot water from Solar instead of Gas)

2025 - Monthly PV Savings :: Expected FIT €6.85 + Money Saved on Energy from PV €57.40 :: Total €64.25 for Oct. (FIT@18.5c/kWh, AvgUnitCstSaving@0.28c/kWh)*Energia increased charges and reduced CEG in Oct'25

2025 - Annual PV Saving progress :: (Jan 41.40, Feb 51.05, Mar 109.85, Apr 154.95, May 207.30, Jun 174.05, Jul 162.95, Aug 155.90, Sep 109.3, Oct 64.25) = €1231.00 Total saved/earned due to PV in 2025

ECO_Mental

352 kWh Oct 2025 6.1kWp South facing Cork.

Looking back over the past years the best Oct was 2022 where I got 413 my worst year was 2023 where I only got 350.

For all ye people who are new to solar, I have seen Nov - Feb production rates half again of Octobers so be prepared

bullit_dodger

Storm systems suppress Northern Europe’s October solar output – pv magazine International

(nothing our stats haven't highlighted)

J_R

Oct 2025

Sligo town 4.8Kw 12 Kw Batts.

CivilEx

259kWh for October - 7kWhp panels - East Mayo, ground mounted

Just passed the one year anniversary since installation - total of 6601kWh from 7kWhp of panels.

ionapaul

For October:

276kWh generated - 6.72kW system facing ESE in South Dublin.

322kWh consumed.

Generation way down on October 2024 (373kWh) and October 2023 (363kWh).

In October, self-used 40% of electricity generated and fed in the other 165kWh (no battery).

Since initial installation on March 7 2023, a total of 22.32MWh generated, 15.6MWh fed to grid, with a self-use ratio of approximately 30%.