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Solar PV Performance Thread - Post your monthly output



  • Registered Users Posts: 52 ✭✭Colm82

    4.1kw system westmeath s/e facing

    442.8kwh total

    5.9 kwh lowest

    20.0kwh highest

    Post edited by Colm82 on

  • Registered Users Posts: 2,497 ✭✭✭ECO_Mental

    A nice even 800 kWh this month, about 11% over my estimated. Month started off great but the last 10 days (apart from today...)have been miserable. As you can see the production was well above the previous 4 months by the middle of the month.....then the clouds rolled in and never went away.

    I have also inserted a moving 30 day average to smooth out the bumps and troughs. What this shows from around the end of March this year I have been pushing out between 25-27 kWh/day

    Monthly Summary

    6.1 kWp in Cork, facing South

    Used 345 kWh (43%) of total generated so saved €103.5 on my Elec bill this month

    Average daily production was 25.8 kWh for the month

    6.1kWp south facing, South of Cork City

  • Registered Users Posts: 1,082 ✭✭✭silver_sky

    4.46kWp SW facing North Co. Dublin

    501kWh generated for July 2022*

    Worst Day 30/07 - 8kWh

    Best Day 10/07 - 27.3kWh

    *Data was lost during 1-2 days when I changed out the data logger incorrectly. My estimate is that it should be approx 520kWh.

  • Registered Users Posts: 2,335 ✭✭✭SD_DRACULA

    7kwp S facing 20kwh battery

    Best day 10th - 47 kwh

    Worst day 30th - 14.8 kwh

    Car - 140 kwh

    Not as bad as I expected given the bad weather, only 57kwh less than last year's.

  • Registered Users Posts: 6,136 ✭✭✭championc

    July Stats

    3.9kWp (S), 10kWh battery, 22 deg Slope

     Generation – 407.44 kWh
     Consumed   - 324.24 kWh
     Import     – 16.31 kWh
     Export     – 52.16 kWh
     Eddi       - 8.7 kWh
     Zappi      - 76.2 kWh

    Meter Readings 05248 (01105 Day - up 4 / 04157 Night - up 6) - Gas 6259

    Totals so far:
    Month    |   2020 |   2021 |   2022 |
    January  |     75 |     56 |     81 |
    February |    122 |    142 |    111 |
    March    |    200 |    269 |    370 |
    April    |    279 |    373 |    372 |
    May      |    396 |    430 |    445 |
    June     |    264 |    425 |    425 |
    July     |    261 |    387 |    407 |
    August   |    254 |    264 |        |
    September|    268 |    248 |        |
    October  |    151 |    185 |        |
    November |     90 |     78 |        |
    December |     56 |     52 |        |
    Total    |   2.41 |   2.90 |   2.21 |

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  • Moderators, Education Moderators, Home & Garden Moderators Posts: 8,170 Mod ✭✭✭✭Jonathan

    4.83kWp south facing, Dublin Fingal

    580kWh generated

    216kWh exported (62% solar self-consumption)

    44kWh imported (6kWh day, 38kWh night)

    30.5kWh generated best day (10th July)

    7.3kWh generated worst day (30th July)

  • Registered Users Posts: 228 ✭✭curioustony

    Roscommon, 4550Wp, Azimuth: 136° (SE), Slope: 24°

    Not so good compared with last year -- But 74% self consumption and 71% self sufficiency with the bulk of that purchased at a low rate. Still happy.

    🌞4.55 kWp, azimuth 136°, slope 24°, 5kW, 🛢️10.9kWh, Roscommon

  • Registered Users Posts: 15,348 ✭✭✭✭AndyBoBandy

    5.78kWp, SE, SW & NE, Dublin, Fingal

    Total Generation: 560.60kWh

    Best Day: July 10th - 26.7kWh

    Worst Day: July 30th - 7.8kWh

  • Registered Users Posts: 12,330 ✭✭✭✭DrPhilG

    July Stats

    7.44kWp (4.03 south/3.41 west), 20kWh battery, Zappi & Eddi – Donegal

    Generation – 679.2kWh

    Export – 40.2kWh

    Import – 44.2kWh

    Best day – 22nd, 36.2kWh

    Worst day - 19th, 6.9kWh

    Days with less than 1kWh purchased - 25.

    A crappy month all round. Getting less than 7kWh in a day in July is mental. Had to do some overnight charging a few times to avoid day rate purchase.

    About 12kWh less than July 2021 despite 20% more panels and a total of 17% below my expected generation.

    That also wraps up another full calendar year for me.

    2020/2021 - 4,822.2kWh

    2021/2022 - 4,869.4kWh

  • Registered Users Posts: 6,136 ✭✭✭championc

    Fantastic use of your 20kW battery - well done 👍

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  • Registered Users Posts: 15,193 ✭✭✭✭Ha Long Bay

    811KW for July with 149KW to the Eddi. 7.2KW South facing in Dublin. Best day was the 10th generated 43.3KW

  • Registered Users Posts: 4,951 ✭✭✭paulbok

    6.84kWp south facing, Roscommon. 4.8kw battery.

    765kWh generated (728 forecast)

    (95.8kWh to Eddi - mostly Eddi heating water all month)

    (91. 5% of total consumption self produced)

    Total consumption 712kWh. 224kWh discharged from battery. 177kWh exported (should hit 1MWh exported for the year in the next 2 days)

    68kWh imported (no day/night meter, but bulk imported during night, early morning)

    40.0kWh generated best day (17th June)

    14.0kWh generated worst day (19th June)

  • Registered Users Posts: 2,735 ✭✭✭yankinlk

    Do you mind me asking what your average daily consumption is? We have similar sized system but I have smaller battery. I used less day rate,I'm guessing it's car charging? I could only see me needing bigger battery in winter, 5 is plenty the last 3 months based on my usage...

  • Registered Users Posts: 12,330 ✭✭✭✭DrPhilG

    Generation and consumption figures @yankinlk

  • Registered Users Posts: 618 ✭✭✭handpref

    5.4 KWP east west split

    East of country - 604 KWH generation

  • Registered Users Posts: 2,735 ✭✭✭yankinlk

    Thanks. So yeah I'm importing 26 for the month, and average daily maybe 10 less than you. Not ruling out a diy battery but not sure I need it tbh.

  • Moderators, Science, Health & Environment Moderators Posts: 5,057 Mod ✭✭✭✭spacetweek

    3.15 kW 9 panel

    2.4 kW Battery

    113.2 kWh Generated for July (seems very low compared to everyone else's figures)

    Worth pointing out that my daily consumption is way lower than all of yours too, I usually use only 8 kWh/day.

  • Registered Users Posts: 6,430 ✭✭✭con747

    Have you checked to make sure all panels are working? What direction are the panels facing? If you have two strings maybe one has a fault. I have a 4.1kw system in the midlands and generated 4 times your generation.

    Don't expect anything from life, just be grateful to be alive.

  • Registered Users Posts: 45,476 ✭✭✭✭Bobeagleburger

    5.7 kWp (SW facing) , west coast.

    690 kWh produced.

    27 kWh purchased from the grid.

  • Registered Users Posts: 6,136 ✭✭✭championc

    You have some for of serious fault with your system. Consumption has absolutely no effect on generation

    Add it into the Solar PV Hints, Tips & Troubleshooting thread

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  • Registered Users Posts: 3,209 ✭✭✭irishchris

    6.9kwp South and 2.88kwp West

    20kw battery

    1063kwh produced for July

    16 kwh imported

    488 kwh exported (FIT payment - €65)

  • Moderators, Sports Moderators Posts: 19,024 Mod ✭✭✭✭slave1

    Nice one, great to break the 1MWh mark in the month (due to two inverters?)

    My stuff for sale on Adverts inc. EDDI, hot water cylinder, roof rails...

    Public Profile active ads for slave1 (

  • Moderators, Sports Moderators Posts: 19,024 Mod ✭✭✭✭slave1


    4.1kWp SW with Winter Shading, 3.3kWp NE

    728kW imported (two EV household)

    717kWh Generated

    643.27kWh consumed

    311kWh diverted to Eddi

    164.3kWh diverted to Zappi

    Approx 1058.1kms of range into the EVs

    Highest was 36.7kWh

    Lowest was 7.3kWh

    75% self sufficient (excluding Evs)

    47% self sufficient (including Evs)


    Monthly cash saving based on average daily load and all non-load items like dishwasher/washing machine/immersion at night rate, €65.437

    My stuff for sale on Adverts inc. EDDI, hot water cylinder, roof rails...

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  • Registered Users Posts: 742 ✭✭✭garbanzo

    So, I joined you all on the Solar Trail this month so happy to report for July.

    4Kw system on an even East : West split based in South Dublin. No battery.

    Total generated: 440kw

    Highest day:22.41 kWh

    Lowest day: 7.69 kWh

    Great practical thread so thanks y’awlll.


  • Registered Users Posts: 485 ✭✭septicsac

    A disappointing 809kwh for July, too many cloudy days

  • Registered Users Posts: 6,136 ✭✭✭championc

    Certainly, when I ran pvgis, it had that May was the highest month of the year, followed by June, then July. So the pvgis projection appears to reflect what most of us are seeing.

    So despite warmer weather, it appears that it's a climatic thing to be quite cloudy

  • Registered Users Posts: 4,432 ✭✭✭Gerry

    3.3kw sw facing, no battery. installed on 15th. so 1/2 the month, 166kw generated. reasonably happy with that. probably lost some without inverter fan early. import 110kw, export 110kw. so basically no charges for usage. those figures not fully including about 30kw generated by 1kw NE facing which pre existed this new install. need to look at moving ct clamps to sort.

  • Registered Users Posts: 1,606 ✭✭✭THE ALM

    South Roscommon, 8.16Kwp, facing 210° at 35°

    Total generation 902kWh

    Consumed 594kWh

    Energy from Grid 45kWh

    Energy to Grid 345kWh

    To the Eddi 141.5kWh

    To the Zappi 172kWh

    To the Battery 145.8kWh

    820kWh projected for July so at least up but could have been better considering the cloud cover for the month. Only broke the 40kWh barrier 4 times when we could really be over the 50kWh, c'est la vie.

    Just received our bi-monthly bill also and used 12 day units and 80 night units in that time. When the new batteries arrive we should be able to drop those night units.

  • Moderators, Sports Moderators Posts: 19,024 Mod ✭✭✭✭slave1

    Great result, you're not a million miles from me so good to see what an unshaded setup can do (and a low tile maximising Summer sun)

    My stuff for sale on Adverts inc. EDDI, hot water cylinder, roof rails...

    Public Profile active ads for slave1 (

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  • Registered Users Posts: 189 ✭✭connesha

    1083.8 kWh for July. Slightly down on June.

    9.36 kWp, E-W, low pitch roof.

    Solis reporting 3kWh imported (this was a scheduled Eddi boost at EV-rate), although Solis is quite inaccurate and Smart Meter will a little show more. (Have a reasonable amount of automation that keeps the grid usage to a minimum without inconveniencing)

    Usage down in the summer (heater off)

    No EV yet. Awaiting BG FIT details...

    System was sized with fringe months in mind, so the March Used vs. Consumed is the more interesting month.

    Best day 50.8 kWh (June was able to hit almost 60kWh)

    Worst day 16.2kWh