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Solar PV Performance Thread - Post your monthly output



  • Registered Users Posts: 415 ✭✭ septicsac

    7.8 Kwh south facing in Louth 377kwh, pretty grim and grey month for production.

  • Registered Users Posts: 415 ✭✭ septicsac

    1 yr since installation of 7.8kwh system, south facing in Louth, probably should be about 100kwh more, with teething issues with inverter faults and the datalogger being offline.

    7586Kwh Generated

  • Moderators, Education Moderators, Home & Garden Moderators Posts: 7,497 Mod ✭✭✭✭ Jonathan

  • Registered Users Posts: 719 ✭✭✭ garbanzo

    Hi again fellow Solar folk.

    Figures the month of November are in with a 4Kw system on an even East : West split based in South Dublin. No battery.

    Total generated: 97.86 kWh

    Highest day:  6th 5.32kWh

    Lowest day: 12th 0.64kWh 

    Slim pickings for sure….🙁


  • Registered Users Posts: 2,275 ✭✭✭ ECO_Mental

    If you take out the car it's an even 1000 kWh for the month, but we both work from home so there is someone in the house every day which makes a difference. I also have two teenage kids (19 +17) that take literally 20-30 minute showers every day so that bumps up my consumption as well.

    I am happy with the performance of the house over the last 12 months I "only" imported 9000 kWh (excluding the EV) which puts me about 55%+ less than the average residential house in Ireland Residential | Energy Statistics In Ireland | SEAI so I think its pretty efficient, but there is always room for improvement.

    Living and working in the house 365 days a year obviously is the driver here, house is around 2500 sqft also

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  • Registered Users Posts: 625 ✭✭✭ DC999

    Ok, so I haven't yet got my head around numbers for an all electric house (which should be the norm of course as we Ta for breaking that out.

    I have 'hidden' usage with my gas cooking and heating I need to factor in. And our kids are a decade younger so less energy hungry :)

  • Registered Users Posts: 934 ✭✭✭ kabakuyu

    2.5 kwp system facing south location Galway.

    Total for November 2022 was 122.6Kwh.

    November 2021 was 120Kwh.

  • Registered Users Posts: 704 ✭✭✭ allinthehead

    3.2 kwp SE, .8 NW, .8 W and a measly 89 kwh produced for November. My pergola and shed mounted panels really suffer at the moment as the sun doesn't rise much above the houses behind me.

    Another 2.4kwp planned for the extension roof in the summer which should make a big difference next winter, just have to build the extension now😀

  • Registered Users Posts: 21 adriant900

    As we are coming to the end of the year, does anyone have their full years daily production that they could share without going to too much hassle? i.e. broken down per day.

    It would help with a project I am working on.

  • Registered Users Posts: 3,364 ✭✭✭ graememk

    Ah, I knew it was from you, just wrong thread!

    Done 1st dec 2021 to 1st dec2022 as Ive made changes at the start of dec which would skew the numbers. csv not allows so xlsx.

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  • Registered Users Posts: 21 adriant900

    Thank you for sharing graememk, that is exactly what I wanted. Much appreciated.

    Few questions if you don't mind.

    What is the capacity of your solar array? What direction is it oriented? What is the slope?

  • Registered Users Posts: 3,364 ✭✭✭ graememk

    8.6 kwp, 4.3 NE, 4.3 SW about 12 degrees slope (walkable)

  • Registered Users Posts: 3,364 ✭✭✭ graememk

    I dont have a full year of this data, but nearly. But what each string is outputting.

    This is DC power so before inverter losses, taken at 10s intervals,

  • Registered Users Posts: 415 ✭✭ septicsac

    326 kWh for Dec 22, up over 110kwh on Dec 21, all on 7.8kwh system in south Louth. Consumption also down 125kwh on last Dec.

  • Registered Users Posts: 1,178 ✭✭✭ Galego

    Is Solis not includes battery charging from the grid as generation?

    Post edited by Galego on

  • Registered Users Posts: 5,346 ✭✭✭ championc

    November Stats

    2.7kWp (S), 20kWh battery, 22 deg Slope, Sth Dublin (Shed 4 not generating anything)

    Generation – 54.67 kWh
    Consumed   - 404.62 kWh
    Import     – 408.42 kWh
    Export     – 4.89 kWh
    Eddi       - 1.0 kWh
    Zappi      - 62.5 kWh
    Meter Readings 06064 (01153 Day - up 15 / 04911 Night - up 402) - Gas 6587 (up 163)

    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 |    435 |
    September|    268 |    248 |    242 |
    October  |    151 |    185 |    221 |
    November |     90 |     78 |     96 |
    December |     56 |     52 |     55 |
    Total    |   2.41 |   2.90 |   4.61 |
    Post edited by championc on

  • Registered Users Posts: 415 ✭✭ septicsac

  • Registered Users Posts: 1,178 ✭✭✭ Galego

    But inverter would still need to use the grid to force-charge the battery once it hits your foc?

    Post edited by Galego on

  • Registered Users Posts: 7,193 ✭✭✭ micks_address

    4kwp south east, 3kwp north west

  • Registered Users Posts: 107 ✭✭ curioustony

    4.55 kWp, azimuth 136°, slope 24°, Roscommon

    83.9 kWh is much better than last years 61.3 -- a good month

    I've noticed that I have winter shading when the sun is below ~14°, first lower string, then the top -- from 11:00 to 13:00.

    I've added a 2nd battery (10.9 kWh now :-)), and started to shift water heating to the immersion @8.42¢ (until kero reduces in price). My hourly buy/sell looks like this for Dec:

    The load shifting is working quite well. I did export/sell a little (1.14 kWh) as I was mucking about with the inverter settings. Be fun to see how that appears on my bill.

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  • Registered Users Posts: 1,268 ✭✭✭ Big Lar

    I also see that the figures don't add up.

    How does one isolate the PV generation figure from the 472Kwh below.

    I know it's a lot more than 472 - 441, but it's deffo not the 472 figure

  • Registered Users Posts: 2,923 ✭✭✭ irishchris

    Great December this year for production particularly the start of the ninth.

    354kwh generated, even 30 euro in fit which for December is crazy

  • Registered Users Posts: 1,614 ✭✭✭ SD_DRACULA

    7kwp S facing W Dublin

    Pretty poor PV due to 4kwp shaded until Feb 😭 but still 18kwh more than last year, batteries to the rescue.

    Post edited by SD_DRACULA on

  • Registered Users Posts: 4,517 ✭✭✭ paulbok

    My Solis hybrid inverter is also charging from the grid without me having set it up. Have had a quick look for the settings controlling it but didn't find them yet. Must delve deeper into it soon, I don't have a night rate so no point adding charging/ discharge cycles to the battery.

  • Registered Users Posts: 4,517 ✭✭✭ paulbok

    That 472 figure is your PV total, that graph only deals with where the pv power went, 93% to the battery and 7% exported. Oddly none consumed?

    The same graph matches up with PV production on my app, the 205kWh matches up with the previous pic I just posted, 115 consumed directly, 84 to battery and 6 exported. Edit: reported grid import matches my meter, the only way my figures add up is to include the 41kWh difference in battery charging/ discharging as coming from the grid.

    I have 41kWh of grid charging to my battery as part of my grid imports.

  • Registered Users Posts: 621 ✭✭✭ silver_sky

    4.46kWp (lets call it 4.5 😂) SW system on a 41 degree tilt

    130.5kWh generation for December 2022

    Best - 9.8kWh on Dec 8th

    Worst - 0.3kWh on Dec 18th

    There are several days above 7kWh but then also the same for days at or below 1kWh. In comparison to November I'm seeing more of a swing between high and low days.

  • Registered Users Posts: 719 ✭✭✭ garbanzo

    Happy New Year fellow Solar folk.

    Figures for the month of December with a 4Kw system on an even East : West split based in South Dublin. No battery.

    • Total generated: 57.64 kWh
    • Highest day:  16th 3.0 kWh
    • Lowest day: 4th 0.78 kWh 

    Slim pickings again but I detect the first “benefit” insofar as my monthly (I pay an even amount each month) electricity bill has been dropped by €30 😀


    Post edited by garbanzo on

  • Registered Users Posts: 645 ✭✭✭ rgfuller

    14th Month

    Dublin - Lucan - December 22 - 7.12kW total 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: 135kWh (63kWh consumed directly, 71kWh into battery, 1KWh to grid)

    Best Day: December 7th - 9.3kWh

    Worst Day: December 10th - 0.5kWh

    Total Consumption: 417kWh (34% Solar: 66% Grid Import (276kWh))

    Milestones & Info:

    Last Year (Dec 2021) Generation 120kWh, Consumption 455.5kWh

    5.934MWh generated in 2021.

    5.041MWh consumed in 2021.

    16kWh to Eddi in December

    Monthly Expected FIT €0.24 + Money Saved on Energy from PV :: €43.98 :: Total Savings €44.22 for Dec. (FIT @ 0.24c/KWh)

    Annual Savings on PV usage (Jan 31.05+Feb 36.29+Mar 66.60+Apr 71.09+May 86.17+ Jun 85.69+Jul 82.64+Aug 88.49+Sep 73.86+Oct 73.44+Nov 70.09+Dec 43.98) = Total PV used savings (2021) = €809.39

    Expected FIT since Feb 15th €592.80* :: (24 Feb, 254 Mar, 272 Apr, 413 May, 382 Jun, 435 Jul, 440 Aug, 151 Sept, 97 Oct, 21 Nov, 1KWh Dec: Total 2470KWh)

    Payback estimate...€809.39 saved + €200TaxFreeFIT + €196.4Taxed50%FIT = 1205.79 / €9650 Cost = 8 Year Payback

  • Registered Users Posts: 1,766 ✭✭✭ bullit_dodger

    Been awhile since i did one of these. Dublin 16 (5.3Kwp split exactly E/W 1.5Kwp and 3.8Kwp)

    Most of the savings (73%) coming from the battery in December. Output from the panels is as follows.

    You can clearly see the snow on the panels from the 9th -> 13th. Last year was 58.5kwhr so it would have been a decent month barring the snow. So the overall efficiency per 1kwp for the month was 10.89Kwhr/1Kwp

    Interestingly the shed installation I have (2.3kwp facing due south) did 31.25Kwhr for the month giving an production of 13.58Kwhr/1kwp. The shed gets a bit shaded with houses in the winter with the low sun angles. In nov the shed nearly matched the main instllation on the house even though it has only 50% of the panels.

    Overall "savings" calculated at about €1350 since install in Oct'21. On track for about a 8 year payback. Course the term "savings" is a loose term and dependent on a lot of factors such as how you use electricity. Also, I don't include "FIT" in my calcs....nor the few crypto sheckles I get when generating heat in the mining rigs.

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  • Registered Users Posts: 1,268 ✭✭✭ Big Lar