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Solar PV Performance Thread - Post your monthly output



  • Registered Users Posts: 752 ✭✭✭ DC999

    I got 138kWh on a 4.9kWp in Dublin. Which is a fair bit higher than you on same size nearly. Mine is 2.7kWp on E which gives me decent output. Half have optimisers for shade which helps. My panels are supposed to be decent in lower light but that could be marketing speel.

    Have a tiny South too, 1kWp. And 1.2 kWp NW that does verily little at this time of year.

  • Registered Users Posts: 9,833 ✭✭✭ Ha Long Bay

    238kWh generated for November 7.2KW South facing in Dublin.

  • Registered Users Posts: 2,964 ✭✭✭ irishchris

    377kwh generated for November

    6 kw South

    2.5 kw West

  • Registered Users Posts: 5,413 ✭✭✭ championc

    November Stats

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

    Generation – 95.54 kWh
    Consumed   - 271.60 kWh
    Import     – 236.16 kWh
    Export     – 7.28 kWh
    Eddi       - 2.1 kWh
    Zappi      - 0.0 kWh

    Meter Readings 05406 (01138 Day - up 10 / 04509 Night - up 231) - Gas 6424 (up 92)

    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 |        |
    Total    |   2.41 |   2.90 |   4.06 |

  • Registered Users Posts: 1,849 ✭✭✭ garo

    I am strictly E/W (well 100 and 280 really) and 22 degree slope which means poorer output in winter. Also I get shading on the eastern half every morning from Nov to Feb. Decided optimisers weren't worth it because output in those 3-4 months is so low anyway.

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  • Registered Users Posts: 800 ✭✭✭ silver_sky

    4.46kWp SW facing system in North Co Dublin. 41 degree roof. Solis 6kW Hybrid inverter, 5kWh battery, Eddi, and Zappi car charger

    November 2022 generation 176.1kWh with 69% self-consumption. This is almost 100kWh less generation than October.

    Worst day 26th Nov - 0.4kWh

    Best day 16th Nov - 12.3kWh

    Note on my self-consumption. This should be higher; however, once generation stops for the day my inverter bounces between import and export. This means at least 1kWh export even without generation that day and also import even if I have enough in the battery. Ticket open with Solis but they're slower than molasses.

  • Registered Users Posts: 114 ✭✭ curioustony

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

    Better Nov for me than last year. Exporting a lot more as I have learned to load shift to take advantage of lower night rates.

    I finally got round to installing home assistant. Thanks to the great work over at, I can see that the lower of my two strings suffers from shading (you cannot actually see a shadow on the panels at this time, too diffuse)

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

  • Registered Users Posts: 1,179 ✭✭✭ Galego

    First full month with the system fully working. 144kwh produced.

    4kwp panels South facing in South Meath. Solis 5kW Hybrid inverter, Eddi, no battery (yet).

    Trying to figure out the slope of my roof. Any tips to do it easy and quick (and minimun tools required)?

  • Registered Users Posts: 114 ✭✭ curioustony

    @Galego I used a flat board and an angle meter app on my phone. The roof is quite accessible as the house is a bungalow.

    I'm sure there are smarter ways!!

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

  • Registered Users Posts: 3 hla

    First full month with a 5.6kW system equal split East/West and 10.2kW battery in Waterford city.

    Produce 132kWh, estimated 125kWh, house consumption 309kWh.

    Worst day 0.5kWh on 26/11/2022.

    Best day 7.8kWh on 4/11/2022

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  • Registered Users Posts: 752 ✭✭✭ DC999

    Fair point on the optimisers - not worth it just for winter as you say. I've them as the flat roof loses the sun earlier than the main roof every day.

  • Registered Users Posts: 752 ✭✭✭ DC999

    @hla + @Galego, welcome to the 1st full month of solar. I'm only a few months ahead of ye.

    Output sucks at this time of year I'm learning. But I was lucky enough to see it in Aug (rocking), Sept (decent but dropped from Aug) and nose dived since. But come Feb it will start to lift again.

  • Registered Users Posts: 19,361 ✭✭✭✭ ELM327

    8.2kWp SSE facing in wexford. Minimal shading but with the low sun, the tops of the trees in the field across the road are having a small impact.

    Total generation 115kWh for the month. 3 days with scheduled power outages, so worst day was 0.1kWh with the panels not generating between 9.00-17.30. Best day 12kWh.

  • Registered Users Posts: 1,179 ✭✭✭ Galego

    Thanks for the welcoming! I am actually happy with the output! So happy that i actually bought a 5kwh battery few weeks ago. :-)

  • Registered Users Posts: 4,590 ✭✭✭ paulbok

    6.84kWp south facing, Roscommon. 4.8kw battery.

    Nov 2022

    268kWh generated (259 forecast) , ahead of the full year forecast since early November,

    (25.8kWh to Eddi )

    (37% of total consumption, self produced)

    Total consumption 634kWh. 125kWh PV to/from from battery. 34 kWh exported

    360kWh imported (no day/night meter)

    19.8kWh generated best day (03rd Nov)

    1.7kWh generated worst day (19th Nov)

  • Registered Users Posts: 1,391 ✭✭✭ THE ALM

    Another month over and our first year done so will put some figures together for the 12 months

    South Roscommon, 8.16Kwp, facing 210° at 35°, 9.6kWh battery

    Total generation 351.5kWh (good bit up on prediction at 292kWh)

    Consumed 583.1kWh

    Energy from Grid 280kWh (increasing as more charge for the EV needed going into the darker months)

    Energy to Grid 46kWh

    To the Eddi 64.3kWh

    To the Zappi 206.5kWh (doubling up on last month with more charging)

    To the Battery 243.20kWh

    From the Battery 208.30kWh

    Best day 5th with 23.2kWh

    Worst day 26th with 1.7kWh

    Running about 87% self use, same as last month

    Energy exported would have generated €8.28 at Energia FIT rate if on a smart meter, we are D/N. Hoping to see a deemed export on the bill this month as the form was only received by ESBN in the last few weeks so have missed out on payments from February.

  • Registered Users Posts: 445 ✭✭ DownByTheGarden

    8kw system.

    Solis monthly report says 377kwh generation this month due to the solis reporting bug.

    Actual generation is 303kwh. I checked the yield last night before the month kicked over.

    So solis report is overestimating it by 74kwh, which is quiet a big error.

  • Registered Users Posts: 445 ✭✭ DownByTheGarden

    Do it the way you learned in school. Go to the kids pencil case, steel their protractor. Use the protractor, piece of string and a nail for weight. Go up to the attic, put the protracor agaist the roof. See where the string lands.

  • Registered Users Posts: 800 ✭✭✭ silver_sky

    The app counts charging from the grid as generation, but the inverter doesn't. It's very strange.

  • Registered Users Posts: 11,480 ✭✭✭✭ DrPhilG

    November Stats

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

    Generation – 154.7kWh (118% of estimate)

    Export – 1.9kWh

    Import – 919.8kWh

    Best day – 3rd, 13.2kWh

    Worst day - 21st, 0.4kWh

    Huge import this month, as I've been running electric heaters in place of using the oil. My estimated savings for November for heat alone is just over €220. I've used over 200 litres less oil compared to November 2021.

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  • Registered Users Posts: 445 ✭✭ DownByTheGarden

    If you go to total yield in your app for end of yesterday. Then go to the total yield at the end of last month. Take one away from the other you get the correct figure.

    So many people think they are generating up to 50% more in the month than they actually are from the people ive been speaking to about it.

    Just looked at mine for today. Right now at 2:25pm It says 11kwh generation. But the real generation is 3.7kwh. That 300% over estimation for today. Awful software.

  • Registered Users Posts: 7,349 ✭✭✭ micks_address

    96kwh - system commissioned 11th of November. 4kw south east, 3kw north west (very little production) North Dublin

  • Registered Users Posts: 2,286 ✭✭✭ ECO_Mental

    6.1 kWp, South facing, just south of Cork City

    291 kWh for November which is as predicted, but 50 kWh less than last November year...

    Best day 22 kWh on the 5th November

    Self-consumption of 58% which is getting better, the EV is soaking up a few more kWh on the good days, but also I am generating less so, the % use is going up.

    I see a lot of people are posting now how much they consumed in their houses well I burned through 1,688 kWh for the month (imported 1,396 kWh). I'm going to have an interesting bill come January, but I am with Electric Ireland so I should get a couple of hundred of a FIT payment (they are promising!!) and the gov subsidy should take a bit of the sting out of it.

    All electric house with an EV so 64% of that consumption is between the EV and the heat pump.

  • Registered Users Posts: 1,693 ✭✭✭ SD_DRACULA

    7kwp South (4kwp shaded until Feb 😭) and 20kwh batteries

    45kwh more than last November.

    Way disappointed with the 10 day units, all trickle usage that the Solis can't see

  • Registered Users Posts: 651 ✭✭✭ rgfuller

    13th Month

    Dublin - Lucan - November 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: 219kWh (80kWh consumed directly, 118kWh into battery, 21KWh to grid)

    Best Day: November 16th - 12.3kWh

    Worst Day: November 22nd - 1.0kWh

    Total Consumption: 422kWh (51% Solar: 49% Grid Import (207kWh))

    Milestones & Info:

    Last Year (Nov 2021) Generation 170kWh, Consumption 460kWh

    Passed 6MWh generated since installation (late Oct 2021).

    22kWh to Eddi

    Monthly Expected FIT €5.04 + Money Saved on Energy from PV :: €70.09 :: Total Savings €75.13 for Nov. (FIT @ 0.24c/KWh)

    Expected FIT since Feb 15th €592.56* :: (24 Feb, 254 Mar, 272 Apr, 413 May, 382 Jun, 435 Jul, 440 Aug, 151 Sept, 97 Oct, 21KWh Nov: Total 2469KWh)

    *Recalculated my Expected FIT (Airtricity)

    Post edited by rgfuller on

  • Registered Users Posts: 100 ✭✭ simpsimp

    Central Dublin, 5.85kWp, SW Facing

    223kWh for November

    125kWh consumed / 98kWh exported

    (Just got a battery in, so will be interested to see how that tips things in December)

  • Registered Users Posts: 3,872 ✭✭✭ rameire

    First Full month after installation for me.

    Location Clonee. Total install 3.8kwp with 5kwh battery.

    East facing 1.52kwp

    South facing 2.28kwp

    Total generation was 142.8 KWH

    Best day was Nov 16th with 8.8kwh, worst was Nov 26th with 0.7kwh.

    Best day overall was October 28th the day after installation with 11.1kwh.

    Consumption has ballooned in the last month, have an inlaw OAP living with us and the day room is an outside shed where the heating is a Dyson, my god its painful seeing the energy in the battery just disappear.

    🌞 3.8kwp, 🌞 Split 2.28S, 1.52E. 🌞 Clonee, Dub.🌞

  • Registered Users Posts: 752 ✭✭✭ DC999

    Wow, nearly 1700kWh used for the month and it’s a decent A rated house from what I recall you said. We’ve a BER at the other end of the scale, but a small house so easier to heat. We used 570kWh in Nov (for house plus low mileage EV, but gas cooker) – that’s most we’ve ever used. We’re also running most heating on electric (plug-in rads). That’s only 110kWp or so for electric heating. Ok, it wasn’t 100% electric heating as also use the gas to ‘boost’ the hall and upstairs (small house).

    Not looking to gloat, but I though us heading for 600kWh was a big jump. In summer we use around 450kWh between the house and EV. So maybe you’re EV does a lot of mileage, ours doesn’t. 

    Edit: We've a gas cooker, which we'll change in time. Use the air fryer too at times

    Post edited by DC999 on

  • Registered Users Posts: 1,813 ✭✭✭ bullit_dodger

    November gone already......

    Slightly better than last year (111.2Kwhr verses 99.4Kwhr last year - PVGIS for me is 96.6Kwhr)

    I know this from last year, but the E/W splits are not good in winter. I generated 111Kwhr from 5.3Kw, giving me 20.94Kwhr/1Kwp. My shed installation (not included above in the spreadsheet) facing exactly 180 generated 65.88kwhr from 2.3Kwp giving me 28.64Kwhr/1Kwp.

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  • Moderators, Education Moderators, Home & Garden Moderators Posts: 7,589 Mod ✭✭✭✭ Jonathan

    4.83kWp south facing, Dublin Fingal, 10kWh battery

    205kWh generated

    8kWh exported (96% solar self-consumption)

    518kWh imported (3kWh day, 515kWh night)

    14.4kWh generated best day (16th Nov)

    0.2kWh generated worst day (26th Nov)

    142kWh natural gas heating (heavily augmented with night electric resistive heating @ 6.7c/kWh)