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Solar PV Performance Thread - Post your monthly output



  • Moderators, Sports Moderators Posts: 17,423 Mod ✭✭✭✭ slave1


    4.1kWp SW with Winter Shading, 3.3kWp NE

    552kW imported (two EV household)

    637kWh Generated

    579.95kWh consumed

    270kWh diverted to Eddi

    147.2kWh diverted to Zappi

    Approx 902.8kms of range into the EVs

    Highest was 34.1kWh

    Lowest was 4.1kWh

    58% self sufficient (excluding Evs)

    51% 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, €58.99

    My savings are "low" versus others as I'm on the fixed Energia plan with low rates (5.84c night). April this year is 20% lower than last year. Passed the 7MWh since install. Hopefully my second string and battery setup will be finalised in May which will give considerable boost to the numbers.

  • Registered Users Posts: 10,009 ✭✭✭✭ Ha Long Bay

    741KW generated for April up from 664KW in March. 7.2K South Facing. 142KW of April's generation went to the eddi.

  • Registered Users Posts: 2,966 ✭✭✭ irishchris

    Yep, at the moment have only 5kw batteries but I have 20kw DIY batteries on the way. Half of them due to be delivered on Friday and others hopefully in the coming days

  • Registered Users Posts: 651 ✭✭✭ rgfuller

    6th Month

    Dublin - Lucan - April 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: 652kWh (213kWh consumed directly, 167kWh into battery, 272KWh to grid)

    Best Day: April 24th - 38.0kWh

    Worst Day: April 12th - 3.8kWh

    Total Consumption: 462kWh (83% Solar:17% Grid (77kWh))


    4kw shy of 2MWh generated since install last October

    2nd Month Generation Exceeds Consumption

    3 Days no import 15th, 21st and 24th

  • Registered Users Posts: 469 ✭✭ raytaxi

    270kWh for April 2.5Kw system in louth west facing

    Best day 14.9 on 24 April

    Worse 1.8 on 12 April

    Broke 2.3mWh day after 1st anniversary of Install first full year was 2296kWh

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  • Registered Users Posts: 40 Ummagumma_78

    April 552 kWh

    Best Day 09th 29.3 kWh

    Worst Day 11th 6kWh

    We are coming up to 1st full year since install on 07thMay21. Have generated 4617 kWh since install. We (3 adults and 2 kids) have consumed 6271 kWh. We are lucky enough to have net metering so have effectively only paid for 1654 kWh since install.

    A little over €300 consumption costs (excluding standing charges) as well as a reduction on our use of oil. Significant financial and environmental benefits.

    Very happy with year 1. Looking forward to expanding the system.

  • Registered Users Posts: 409 ✭✭ handpref

    5.4 kwp east west split-

    April generation 444kwh

  • Registered Users Posts: 1,847 ✭✭✭ bullit_dodger

    Very similar installation as yourself handpref (5.3Kwp here split 1.5Kwp East/3.8Kwp West) in Dublin 16. Although fairly dissimilar production graphs for the month.

    Totaled 479Kwp for the month verses your 444Kwp. That's close enough that it doesn't matter a dam. It's interesting to me that you have a 5x days with more than 25Kwhr to my 2. Where are you located? Just wondering if you had any shading on the start of the month (for example a chimney that might have been reducing production which no longer was an issue later on when the sun was higher?)

  • Registered Users Posts: 78 ✭✭ zenit

    First full month, 3.1 East/ 2.4 West, 504kWh.

  • Registered Users Posts: 791 ✭✭✭ reklamos

    There is smth not right with these figures. How can battery discharge is higher than charge?

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  • Registered Users Posts: 1,847 ✭✭✭ bullit_dodger

    Can do - albeit it depends on how they classify it. "Generation" was 741Kwhr of which 263kwhr went to the battery. There's a 31Kwhr in "Energy from Grid" which of course you'd need to specify where that went. Did it go to the house, or the battery? Interestingly, if you add 263Kwhr, and that 31Kwhr, you get 294Kwhr - which is pretty close to that 290Kwhr which the battery discharges. So you probably have 27kwhr of that 31kwhr (from the grid) going to the battery. I know - I know.......

    GivEnergy are also guilty of that ambiguity.

  • Registered Users Posts: 5,059 ✭✭✭ SouthWesterly

    Just did the maths on my electricity bill for the last 2 months. Generated 615kw of solar. Used 400kwh less (day usage) than the same time last year when we didn't have solar pv (Feb - April). Saved 89 euro on just the energy. Add vat and it becomes €101 saving.

    Also saved 139kwh night rate which was €17 savings. I assume it's down to the heat pump drier we have.

    3.24kw system facing west

  • Registered Users Posts: 791 ✭✭✭ reklamos

    I was wondering if the figures should not be otherway round. There are charge/discharge loses and 10% is a figure that I would expect.

  • Registered Users Posts: 1,847 ✭✭✭ bullit_dodger

    Ohh 100% mate. Totally agree with you - they all do it though. There's a certain ambigutiy around where they are measuring.....and they could be clearer as to where the stuff goes.

  • Registered Users Posts: 11,486 ✭✭✭✭ DrPhilG

    April Stats

    6.2kWp (2.8 south/3.4 west), 20kWh battery, Zappi & Eddi – Donegal

    Generation – 575.9kWh, a 12% decrease from 2021

    Export – 14.9kWh, down from 79.3kWh in 2021

    Import – 277.3kWh, slight (17kWh) increase from 2021

    Best day – 27th 36.8kWh

    Worst day - 4th, 3.6kWh

    Days with less than 1kWh purchased - 10

  • Registered Users Posts: 1,847 ✭✭✭ bullit_dodger

    Days with less than 1kWh purchased - 10

    I like that stat. As in the metric itself......useful stat to know.

  • Registered Users Posts: 11,486 ✭✭✭✭ DrPhilG

    Yeah I had previously counted days with zero export but even on a great day you'll sometimes buy 0.1 or so just by bad timing so I count the sub 1 days instead.

  • Registered Users Posts: 1,718 ✭✭✭ SD_DRACULA

    The reality is that every single day is a day with less than 1kwh since the inverters cannot detect with 100% accuracy the usage as they still take some time to react to the load.

    It might be: Days with apparently less than 1kWh purchased - 10

  • Registered Users Posts: 172 ✭✭ harderthanf

    6.8 kwp Wexford. Eddi and Zappi. 2 EVs.

    Generated: 807kWh

    Exported: 164kWh

    Imported: 314kWh

    Zappi: 348kWh

    Eddi: 53kWr

    Lowest generation day: May 5th - 3.3kWh

    Highest generation day: May 24th - 45.9kWh

  • Registered Users Posts: 1,847 ✭✭✭ bullit_dodger

    Very true - although you could argue that the latency works both ways. You might be exporting a little before the inverter logs it as an export, in which case you may have "balanced" some of the import that you had delays in logging. If you follow me?

    The main thing though isn't really about 0Kwhr or <1Kwhr, it's that the "number of days" figure. I like the stat, it's a good one.

    For me, it's easy! Everyday I don't have enough :-)

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  • Registered Users Posts: 5,426 ✭✭✭ championc

    Whey hey, for sub 1kW imports

    10 days in March

    15 days in April

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

    4.8kW EW Dublin. 10kWh DIY battery

    April 2022 (kWh):

    Production: 501 (442 predicted, 563 last year)

    Consumption: 752.1

    Import: 283(53d, 230n)

    Export: 31.9 (94.2 last year)

    Best day: 24th: 27.9

    Worst day: 12th: 3.4

  • Registered Users Posts: 1,397 ✭✭✭ THE ALM

    8.16kW Midlands. 5kWh battery, Eddi, Zappi, EV

    Down slightly on March and up slightly on projected production. Have been away for the last 10days so exported more than normal.

    Generated 857.5kWh

    Consumed 654.6kWh

    Battery 155kW

    Zappi 119.8kW

    Eddi 95.9kW

    Only one day beat the highs of March which was on the 29th at 46.7kW.

  • Registered Users Posts: 976 ✭✭✭ kabakuyu

    Just completed my first full year of solar yesterday.A 2.5 kwh system facing south in Galway.

    Total for the year was a respectable 2,708 kwh.

    Best day was 18.9kwh.

    Worst day was .6kwh

    Best month was July with 339.7kwh.

    Worst was December with 67.8kwh.

  • Registered Users Posts: 2,293 ✭✭✭ ECO_Mental

    I'm calling it early!!...... its 19:30 but heavy clouds if I get another 0.5 kWh today Ill be very lucky

    Anyway big month 811 kWh..... best bay 44.2 kWh and worst day 6.5 kWh

    My home assistant is saying 830 kWh and that's from a ShellyEM, but I have been using Solis readings all the way along so I will be consistent. Actually from the solis web page its saying 800 kWh but the reading from the actual inverter scrolling through it says 811 kWh. I think they updated the online portal during the month so I am assuming the online reading is a bit short.

    What HA is saying though I generated more energy than I consumed for the month, but actually only used 40% of it the rest went back into the grid. I am happy with that at least I can say I am carbon neutral.

    I also over performed on the PVGIS-SARAH estimate by about 10%.

    All data on the PVStats website and the google sheets doc

  • Registered Users Posts: 3,561 ✭✭✭ graememk

    I'd say the Shelly is more accurate, as the logging is only every 5 minutes on the solis.

  • Moderators, Category Moderators, Motoring & Transport Moderators, Regional East Moderators Posts: 61,191 CMod ✭✭✭✭ unkel

    1.12MWh, the new array is helping. Will I get 1.5MWh next month?

  • Registered Users Posts: 5,426 ✭✭✭ championc

    May Stats

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

     Generation – 445.69 kWh
     Consumed  - 314.52 kWh
     Import   – 19.02 kWh
     Export   – 100.39 kWh
     Edd9    - 31.7 kWh
     Zappi   - 58.6 kWh

    Meter Readings 05238 (01099 Day - up 3 / 04138 Night - up 11) - Gas 6239

    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 |        |
    July     |    261 |    387 |        |
    August   |    254 |    264 |        |
    September|    268 |    248 |        |
    October  |    151 |    185 |        |
    November |     90 |     78 |        |
    December |     56 |     52 |        |
    Total    |   2.41 |   2.90 |   1.38 |
 - Solar Capacity and production analysis -

  • Moderators, Education Moderators, Home & Garden Moderators Posts: 7,611 Mod ✭✭✭✭ Jonathan

    4.83kWp south facing, Dublin Fingal

    606kWh generated

    196kWh exported (67% solar self-consumption)

    26kWh imported

    33kWh generated best day (14th May)

    5kWh generated worst day(s) (9th and 17th May)

    A big drop in self-consumption this month. Haven't been using the oil radiators, and it hasn't been warm enough to warrant the portable AC unit either. The 5kWh battery has been covering our needs entirely since 9th May (charged from grid a few nights at start of May as weather was muck).

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

    4.8kW EW Dublin. 10kWh DIY battery

    May 2022 (kWh):

    Production: 584.7 (579 predicted, 650.6 last year)

    Consumption: 690.3

    Import: 149(41d, 108n)

    Export: 53.4 (123.5 last year) - was away a few days

    Best day: 27th: 31.1

    Worst day: 9th: 5.7