If you have a new account but are having problems posting or verifying your account, please email us on [email protected] for help. Thanks :)
Hello All, This is just a friendly reminder to read the Forum Charter where you wish to post before posting in it. :)
Hi all, The AutoSave Draft feature is now disabled across the site. The decision to disable the feature was made via a poll last year. The delay in putting it in place was due to a bug/update issue. This should serve as a reminder to manually save your drafts if you wish to keep them. Thanks, The Boards Team.

Solar PV Performance Thread - Post your monthly output



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

    Funnily enough my generation in October 2021 was only 0.2kWh different. But given that I've gone from 6.2kWp to 7.44kWp, October has been a turd.

    Fell 47.5kWh short of prediction, so only 84% of what I had hoped. August hit 115% and September 114% though so it's all good.

    Estimate for November is 130kWh.

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

    ctober Stats

    3.9kWp (S), 20kWh battery, 22 deg Slope, Sth Dublin

    Generation – 221.17 kWh
    Consumed  - 217.67 kWh
    Import   – 59.37 kWh
    Export   – 17.21 kWh
    Eddi    - 3.1 kWh
    Zappi   - 13.7 kWh

    Meter Readings 05406 (01128 Day - up 8 / 04278 Night - up 57) - Gas 6332 (up 39)

    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 |        |
    December |     56 |     52 |        |
    Total    |   2.41 |   2.90 |   3.10 |
 - Solar Capacity and production analysis

  • Registered Users Posts: 752 ✭✭✭ DC999

    October 2022

    4.9kW Dublin 12. Split is: E 55%, S 25%, NW 20%

    Production: 240 kWh

    Best day: 14 kWh (had a few of those)

    Worst day: 0.3 kWh

    Consumption: 465 kWh (including EV + heating for now while boiler is off)

    Self-use (no battery so always a challenge): 47%. Trying to run some low-watt electric heaters to keep boiler off 

  • Registered Users Posts: 651 ✭✭✭ rgfuller

    12th Month

    Dublin - Lucan - October 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: 355kWh (117kWh consumed directly, 141kWh into battery, 97KWh to grid)

    Best Day: October 1st - 20.3kWh

    Worst Day: October 19th - 0.6kWh

    Total Consumption: 407kWh (67% Solar: 33% Grid Import (135kWh))

    Milestones & Info:

    50kWh to Eddi

    1 Full Year of install/production - See the yearly performance thread

    Monthly Expected FIT €11.64 + Money Saved on Energy from PV :: €73.44 :: Total Savings €85.08 for Oct. (FIT @ 0.14c/KWh)

    Expected FIT since Feb 15th €340.78 :: (24 Feb, 254 Mar, 272 Apr, 413 May, 382 Jun, 435 Jul, 440 Aug, 151 Sept, 97KWh Oct : Total 2448KWh)

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

    309kWh generated for October with 22.8KW to the Eddi. 7.2KW South facing in Dublin. Best days were the 1st and the 10th generated 17KW on both days.

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

    West Dublin 7kwp S facing 20kwh battery

    Best day - 1st with 25kwh

    Worst day - 19th with 4kwh

    Days without import - 10

    Marginally better than last year's

    @Ha Long Bay your values seem a bit low and we seem to have similar system, you got any major shading?

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

    No shading at all when I check back both strings are performing at a similar level. I am the other side of the city. Looking back that day on the 19th I generated 1kwh where you produced 4kwh.

    21 panels so there will always be a slight deviation between strings.

  • Registered Users Posts: 724 ✭✭✭ garbanzo

    Hi fellow Solar folk.

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

    Total generated: 190.05 kWh

    Highest day:  1st October, 10.56kWh

    Lowest day: 19th October 0.47 kWh (note: that was the day it absolutely lashed all day and we’d thunder and lightning, though I consoled myself that the panels got a good wash 😀)

    Pleased to report we received the full SEAI grant last month of €2,400 too. 


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

    Myself and Jonathan have similar systems, both in Dublin about 10-15 miles apart......but on dark grey days he'd always struggle to match my output (sub 1-2Kwhr), but on sunny days in winter, his south facing as opposed to my E/W would demolish my output.

    I don't think we ever definitively sorted it out the reason (which galls me), but the best theory was that some panels are simply better at converting ambient light into power and/or my inverter was better at dealing with dealing with ambient light than his.

    It was consistent too - but more of a point of interest rather than either of us having a "fault" as such.

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

    Just curious now @SD_DRACULA my best month was May. How do your figures compare.

    JA panels and 6K Solis inverter here.

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

    For me the top was August with 908kwh

    About the same in May it seems:

    Probably just random clouds

    It's all down-hill from here 12 panels shaded until mid-Feb 😭

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

    Generated 413 kWh for October for my 6.1 kWh system. Cork, South Facing.

    Only used 44% of it and put that down to working in the office for all of the month until I get my working from home sorted. As a result I was not able to charge the EV on the few good days we had. Last October I generated 435 kWh so not that far off

    I must chase up those Feckers in ESBN to get my Smart meter installed so I can get the full benefit for the Feed in Tarriff and use the extra low nigh rate

  • Moderators, Sports Moderators Posts: 17,372 Mod ✭✭✭✭ slave1


    Array 1: 4.1kWp SSW with Winter Shading, 3.3kWp NNE

    Array 2: 2.73kWp SE, 0.91kWp S, 3.64kWp SW (all neighbourhood shading/optimised)

    522kW imported

    480kWh Generated

    410.2kWh consumed

    214kWh diverted to Eddi

    125.9kWh diverted to Zappi

    Approx 810.8kms of range into the EVs

    Highest was 37.8kWh

    Lowest was 3.3kWh

    74% self sufficient (excluding EVs)

    44% 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, €56.45

  • Registered Users Posts: 445 ✭✭ DownByTheGarden

    Are either of you charging your battery from the grid at night. Because the generation is way over estimated for the following day unless the solar generation exceeds what you charged the battery by. For example if you charged the battery last night look at your generation today in the solis app and see if it checks out.

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

    I have my system on Standby from 23:00 - 23:59 and then charge my batteries from 00:00 - 07:59.

    It makes the figures cleaner and easier to see when all charging and discharging in the same 24hr cycle

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

    I've a Givenergy system and Jonathan a Solis one as I recall - and that was a part of the logic I mentioned previously. One inverter may have different algorithm to squeeze out a few extra watts out the panels over another. The other thing is that some panels just are better at diffuse light than others.

    No, this wasn't a reporting thing I think - but I do raise it to keep in mind when comparing similar system. You can't just look at the dark days and if you have a difference, you have a problem. You should also look at the bright clear days in the same month and compare those. If you have a difference there also and you have the same aspect/orientation, then you could have a problem alright.

  • Registered Users Posts: 445 ✭✭ DownByTheGarden

    The reason i mentioned it was that solis reports the battery charge as generation, when its not really generation

  • Registered Users Posts: 418 ✭✭ septicsac

    Oct on 7.8KW in louth generated 479kwh, no stats etc as without datalogger until new one comes into stock.

  • Registered Users Posts: 2,625 ✭✭✭ yankinlk

    Solis cloud app is wrong but you can use the Solis Home app and get the correct numbers.

    ..... tldr

    Actually they are both correct... the issue is the daily reporting for gen includes import at night rate as day gen. But the monthly number only includes sunshine captured. I just checked October, and they both match.

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

    October 22

    543 kWh generated

    From November on can see me charging battery 50-80% on night rate as month progresses but was surprised at October results as expected to be importing more on night rate that month but managed to get through without having to charge battery. Shame with balancing still pull handful of units as pinergy day rate is ridiculously high.

    124kw exported @ 21c (€26.04)

    10kw imported @ 43c (€4.30)

    2kw imported @ 6c (12c)

    Profit on units €21

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

    That's very interesting. I find the same with my south facing panels. On great days it's great, but on less than mediocre days it seems to produce less than E/W. I've a plan for 4kWp west facing.

  • Moderators, Sports Moderators Posts: 17,372 Mod ✭✭✭✭ slave1

    E/W is 80% of S but if better sunlight gain in the mornings and evenings then E/W trumps.

    Always said if I was out the country I'd have two arrays, one S and the other E/W (and tilting)

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

    I'm out the country and my plan is for all 3. 8kWp currently south, then next is a 4kWp west and 4kWp northeast (don't have an east facing roof)

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

    4.83kWp south facing, Dublin Fingal

    322kWh generated

    11.5kWh exported (96% solar self-consumption)

    240kWh imported (4kWh day, 236kWh night)

    22.1kWh generated best day (17th Oct)

    0(!!)kWh generated worst day (19th Oct).

  • Registered Users Posts: 445 ✭✭ DownByTheGarden

    Im looking at this months report. It says ive generated 57kwh so far in november. If I look at yield on the inverter page though the yield for the month is 31kwh. The monthly report is wrong. Either way its a bug in the software and solis should address this. If that happened in my company it would be a priority to correct the buggy software and it would be done in a day or two at most.

  • Registered Users Posts: 2,625 ✭✭✭ yankinlk

    I agree... all im saying is... you wait untill next month and it will be resolved. My monthly data is wrong for Nov... but its correct for previous months (like October). They do resolve the calculation later.

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

    My figures still don't match.

    Solis Home says 254 for October, Solis Cloud says 387.

  • Registered Users Posts: 2,625 ✭✭✭ yankinlk

    Shrugs. I dunno. Any chance something is different in your home app? Mine looks like this... for comparison.

    Not defending it, the cloud app looks a mess when winter arrives amd night changing takes over.

  • Registered Users Posts: 5,032 ✭✭✭ John mac

    October stats , 7.4KW east west even split , Mayo.

    Total :- 248.6 KWh

    Best day 14th . 17KWh

    Worst day 29th . 2.1KWh

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

    4.8kW EW Dublin. 10kWh DIY battery

    November 2022 (kWh):

    Production: 100.8 (100 predicted, 101.4 last year)

    Consumption: 831

    Import: 736 (70d, 666n)

    Export: 5.8

    Best day: 4th: 6.1

    Worst day: 26th: 1.2