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Solar for Beginners [ask your questions here]

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Comments

  • Registered Users, Registered Users 2 Posts: 9,560 ✭✭✭con747


    Bump

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



  • Registered Users, Registered Users 2 Posts: 9,560 ✭✭✭con747


    Bump

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



  • Moderators, Science, Health & Environment Moderators Posts: 4,809 Mod ✭✭✭✭Tree


    Time for the mods to spawn round 2?



  • Moderators, Home & Garden Moderators Posts: 7,017 Mod ✭✭✭✭graememk




  • Registered Users, Registered Users 2 Posts: 9,560 ✭✭✭con747


    I think the couple of bump posts I posted kicked it back to normal.

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



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  • Moderators, Education Moderators, Home & Garden Moderators Posts: 8,307 Mod ✭✭✭✭Jonathan




  • Moderators, Category Moderators, Arts Moderators, Sports Moderators Posts: 53,104 CMod ✭✭✭✭magicbastarder


    Our system is due to be installed this week but I'm getting worried now about how much effect seagull scutter can have on them - would one big seagull s*** be enough to affect a panel? Especially without optimisers on that string?



  • Moderators, Home & Garden Moderators Posts: 7,017 Mod ✭✭✭✭graememk


    Rain washes it off quite easily. A small bit Doesn't really effect it



  • Moderators, Category Moderators, Arts Moderators, Sports Moderators Posts: 53,104 CMod ✭✭✭✭magicbastarder


    Cheers. Will have to talk to our neighbours though, they leave their leftovers out for the seagulls so we do get lots of them around at times. So we do get more than our fair share of seagull ****.



  • Registered Users, Registered Users 2 Posts: 9,097 ✭✭✭10-10-20


    Feeding fat seagulls. Well that's daft altogether.



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  • Moderators, Category Moderators, Arts Moderators, Sports Moderators Posts: 53,104 CMod ✭✭✭✭magicbastarder


    guess who was supposed to have his solar panels installed today?

    image.png


  • Registered Users, Registered Users 2 Posts: 8,012 ✭✭✭Soarer


    Don’t beat yourself up.
    My install brought an end to the 4 weeks of continuous blue skies and sunshine, and replaced it with blanket clouds!



  • Moderators, Home & Garden Moderators Posts: 7,017 Mod ✭✭✭✭graememk


    So it was your fault 😂. (Although we were needing some rain)



  • Registered Users, Registered Users 2 Posts: 8,012 ✭✭✭Soarer


    Got my email yesterday confirming my NC6.
    But when I login to the Network site, I still don’t see anything if the generation I’ve exported in the last few weeks.
    Is there something I’m doing wrong, as I’m sure I read somewhere that your smart meter registers your exports from day one.



  • Registered Users, Registered Users 2 Posts: 192 ✭✭serox_21


    I had my NC6 approved last Friday as well. Exports data will show up starting with the day they confirmed your NC6.
    It will take 2-3 days to show up exports on the esb website. Previous exported data is not counted. Only from the day they approve you NC6 and a MEC was added to your account.
    On your MPRNs and notification settings you should see similar to this:

    Screenshot 2025-06-13 at 10.03.49.png


    Exported electricity will be payed starting with the date they approved your MEC.



  • Registered Users, Registered Users 2 Posts: 192 ✭✭serox_21


    I have a shelly EM and the CT from the inverter measuring the import/export of house power.
    Comparing them with the ESB Networks data there is always a small mismatch
    Each day there is a between 0.1 - 0.5 Khw extra consumption on the ESB side than what my shelly/inverter is reporting and 0.2 -0.7Kwh less on ESB side for the export.

    Seems that this smart meter likes to measure electricity in ESB advantage, more on the import side and less on the export.

    Did anyone else noticed this behaviour. If it was my shelly EM measuring more/less the esb meter should show extra or less for both import and export.



  • Registered Users, Registered Users 2 Posts: 9,097 ✭✭✭10-10-20


    The ESB meter is far more advanced than a clip-on CT with a measurement accuracy of 1%. The position of the CT over the wire or surrounding electrical noise can hamper the accuracy of the readings.

    Even more professional meters have the same accuracy of 1%:

    https://www.meteorelectrical.com/distribution-control/meters.html



  • Moderators, Home & Garden Moderators Posts: 7,017 Mod ✭✭✭✭graememk


    Id agree, the ESBN meter is the most accurate, and the one that matters.

    If it's within 1% it's fine.

    If it was way way out I'd be investigating more. But I'd be quicker to blame the shelly rather than the actual meter



  • Registered Users, Registered Users 2 Posts: 192 ✭✭serox_21


    Yes, definitely Shelly EM is the the one that's not accurate. I'm not seeing huge differences, and less than 1KWh difference a day it's OK.
    Example for the 11th of June on Wednesday when it was sunny most of the day.
    Shelly was showing an export of 33.1Kwh while esb on their portal is showing 32.7Kwh.

    Noticed that ESB will record on the 30 min hdf file even a 0.0010KWh consumption, which is just 1Wh for that 30 min interval. Really sensible metering device. My Shelly won't pick than up.



  • Registered Users, Registered Users 2 Posts: 8,012 ✭✭✭Soarer


    Right, here's one for the learned.

    My export data started showing up on the Networks page on Thursday.
    Thursday - 11.6kWh
    Friday - 7.4kWh

    I force discharge my battery every night before my cheap rate. When I check my app as to what I've discharged, the figures are…
    Thursday - 10.09kWh
    Friday - 7.42kWh

    Those figures aren't a million miles away from the Networks figures.

    What are a million miles away are my solar exports.
    Thursday - 4.5kWh
    Friday - 28.76kWh

    Probably a daft question, but is it possible that my solar isn't being exported? It's going to the battery/house only? Or what other sort of explanation could there be?



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  • Registered Users, Registered Users 2 Posts: 9,097 ✭✭✭10-10-20


    There's something missing from the overall story as Friday most certainly doesn't add up at face value. And when you say 'solar exports' do you define that as the solar generation for the day as read off the inverter directly? The energy isn't vaporising anyway, it's most likely either being stored or being consumed internally or exported.

    What size battery do you have, what tariff plan are you on and do you have an EV charging or a cylinder heater engaging at any point? What controls the energy dump at night and how does it calculate the export period beforehand? Did Friday morning's cheap-rate import session complete successfully and what % was the battery at when the solar kicked in?

    Some smart plans have a night-boost from 2am to 4am, so a portion of the power stored from the day before would be dumped onto the grid after 12am, ie the next day. So hypothetically Friday may have been a good day for generation, storing a good portion of the 28.76kWh into the battery, and for all we know maybe it was also the day when you decided to put on a 30l boil of barley for your next beer fermentation. 😁

    That's why you need an energy dashboard, such as the one in Home Assistant as that will demonstrate the energy flows which aren't apparent to you from the meter data.

    https://www.home-assistant.io/docs/energy/

    Random example dashboard:

    image.png

    Hope it helps.



  • Registered Users, Registered Users 2 Posts: 8,012 ✭✭✭Soarer


    Thanks, it certainly does help.
    I’ll answer all your questions in a bit, but panic averted with my original question. The Networks monitor obviously took the weekend off, ‘cause everything is up to date today!



  • Registered Users, Registered Users 2 Posts: 6,018 ✭✭✭greasepalm


    I have had solar thermal panels on roof not heating the water and wonder where might i get a list of service agents that can service them in Dublin. Cheers.



  • Registered Users, Registered Users 2 Posts: 961 ✭✭✭whosedaddy?


    Planning to do DIY install. SemiD in North Dublin built in the 50s.
    Before looking into the actual electrical side , I need some guidance on the roof .

    The SEAI guidance says that contractors need to assess the roof and in doubt you need an engineer / need fix.
    I wonder has any installer ever called out any concern? And fixes were needed? How bad does it have to be?

    My roof has support purlin across the rafters. And that purlin is bowing with a few cracks , the southern one more than the one on the northern roof.
    But almost all roofs in the neighbourhood are sagging to some degree and none of their installers seem to have complained. Some members here also had pics uploaded showing the dip in the middle.
    But because I want to DIY , I’d need some reassurance that it’s not going to collapse on me….
    If anyone has any recommendations for a structural engineer in the Dublin area who does those site surveys please DM me. I’ve tried cold calling engineers and they didn’t want to know (too small of a job).



  • Registered Users, Registered Users 2 Posts: 6,018 ✭✭✭greasepalm


    Just to be aware of if its the original roof with tiles they may now be like a kit kat and break while walking on them as happened to me.



  • Registered Users, Registered Users 2 Posts: 1,277 ✭✭✭Curry Addict


    Im wondering do I have a problem in my system. Newly installed. Im getting an absolute peak of 4.6kw generation from a 5.7kva system on a perfect solar day like today and yesterday. its an east/west configuration. i would expect a higher generation with the sun directly above on a nice sunny day like today. i have limited experience as its a new install.



  • Registered Users, Registered Users 2 Posts: 15,711 ✭✭✭✭loyatemu


    I have 6.5kwp east/west and I don't think I've ever exceeded 5kw generation.

    With the sun directly overhead both banks of panels are going to be below full generation due to the angle of the roof.



  • Registered Users, Registered Users 2 Posts: 961 ✭✭✭whosedaddy?


    true. But forgot to add that the 70 year old felt is kaput and patched on so many occasions, so plan is to get it refelted anyway ( solar or not). And tiles checked.



  • Moderators, Home & Garden Moderators Posts: 7,017 Mod ✭✭✭✭graememk


    Any graphs of the production to show?

    The east west, on a normal roof pitch the power curve is lower at mid day but starts sooner and finishes later.

    A simplified example,

    If sun is directly above, and panels are at 45 degrees east, only half the panel would be visible to the sun,



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  • Registered Users, Registered Users 2 Posts: 979 ✭✭✭homewardbound11


    Anyone use anchors for ground mount systems ?( see attached Pic) . I’m trying to see if ground mounts would have any chance against another storm Eowyn if it ever happened again

    Last question . I queried on previous posts what should the trench depth be and all said 600 mm. My site inspection rep commented as it’s low voltage DC it’s not covered/ regulated . I’m still going with 600mm unless I get caught with rock or other pipes . Is this correct ?

    IMG_9895.jpeg


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