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Solar PV Performance Thread - Post your monthly output

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Comments

  • Registered Users Posts: 1,840 ✭✭✭ garo


    The person on that thread posts a response from Pylontech customer service.
    Hi Kay,

    Thank you choose our product!

    Just like telephone battery cell, all normal lithium battery will get hurt in low temperature working condition specially in charging mode. For longer cycle of life and calender life we limit the current in low or high temperature. You can google the knowlage of "Lithium dendrites" if you have interesting.

    So our BMS of battery work together with inverter to limit the current to protect our battery cells. It is intelligent design.

    My proposal is:

    Install a heating system for our battery (heat in the cabinet). Rise the temperature above 10℃. And the battery's comfortable temperature is 18~28℃.
    Thanks and best regards!

    Yes it does result in unnecessary export to the grid. I'm not sure what I can do to fix this.


  • Moderators, Category Moderators, Motoring & Transport Moderators, Regional East Moderators Posts: 59,685 CMod ✭✭✭✭ unkel


    He acknowledges that the BMS will not let you charge the battery below 0C, which is sound. But he is nowhere suggesting that the amps should be limited to 10A under 10C, is he?

    And installing a heating system is a pretty terrible suggestion. It will cost more to run than the solar will generate that day. But sure it will protect the battery and that is all the battery manufacturer is interested in. Tesla does this too in the Powerwall. Wait till Sir Liamalot reads this, he'll have a right rant :p

    I'd say use common sense instead...

    "Wind is Ireland's oil" - An Taoiseach, 25/05/2022



  • Registered Users Posts: 1,840 ✭✭✭ garo


    Read the thread will ya. The response from Pylontech was to a question about limiting charge to 10A per battery.

    And yes heating the battery is a terrible idea.


  • Moderators, Category Moderators, Motoring & Transport Moderators, Regional East Moderators Posts: 59,685 CMod ✭✭✭✭ unkel


    garo wrote: »
    Read the thread will ya. The response from Pylontech was to a question about limiting charge to 10A per battery..

    Am I missing something? The problem was the guy was wondering why if he switched on a function (dvcc), presumably on his Victron or his inverter and nothing to do with the battery itself that the Pylontech batteries (!) charged slower

    And the answer from Pylontech was:

    "Hi Kay,

    Thank you choose our product!

    Just like telephone battery cell, all normal lithium battery will get hurt in low temperature working condition specially in charging mode. For longer cycle of life and calender life we limit the current in low or high temperature. You can google the knowlage of "Lithium dendrites" if you have interesting.

    So our BMS of battery work together with inverter to limit the current to protect our battery cells. It is intelligent design.

    My proposal is:

    Install a heating system for our battery (heat in the cabinet). Rise the temperature above 10℃. And the battery's comfortable temperature is 18~28℃.
    Thanks and best regards!"

    Which is a very vague answer with no specs / parameters

    "Wind is Ireland's oil" - An Taoiseach, 25/05/2022



  • Registered Users Posts: 12,242 ✭✭✭✭ joujoujou


    Nice day, nice result, I'd say. ;)

    501988.png


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  • Registered Users Posts: 1,840 ✭✭✭ garo


    unkel wrote: »
    Am I missing something? The problem was the guy was wondering why if he switched on a function (dvcc), presumably on his Victron or his inverter and nothing to do with the battery itself that the Pylontech batteries (!) charged slower

    Which is a very vague answer with no specs / parameters

    Agreed the answer is vague but I have searched the web and anecdotally there is charge limiting under 10C. This link has more info: https://batteryuniversity.com/index.php/learn/article/charging_at_high_and_low_temperatures
    Stands to reason that slower charging at lower temps helps preserve battery life. There is nothing in the manual indicating this si I will have to wait for a sunny warm day to confirm what I have observed.


  • Moderators, Category Moderators, Motoring & Transport Moderators, Regional East Moderators Posts: 59,685 CMod ✭✭✭✭ unkel


    If it was my battery, I'd give it the full amps from about 5C. Provided the BMS hasn't already some more sophistication built in other than temp <0C => charging is a no no :D

    "Wind is Ireland's oil" - An Taoiseach, 25/05/2022



  • Registered Users Posts: 1,840 ✭✭✭ garo


    I do believe this charge limiting is coming from the BMS. Any idea how to access the BMS settings?


  • Registered Users Posts: 1,478 ✭✭✭ MAULBROOK


    Lads can we keep this on track.

    Solar PV Performance Thread - Post your monthly output


  • Registered Users Posts: 1,840 ✭✭✭ garo


    Thanks for the reminder. Could a mod move this discussion to the other thread?


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  • Registered Users Posts: 1,478 ✭✭✭ MAULBROOK


    Good day today 18'1 kw.
    7 kw battery full by 1pm and water heated.
    Getting better day by day.


  • Closed Accounts Posts: 18,961 ✭✭✭✭ Shefwedfan


    Oh I’m all excited now with a full month performance nearly here to see how it’s going


  • Registered Users Posts: 5,201 ✭✭✭ championc


    Interesting to note this morning that @ 09:00, with the sun at 13 deg high and off to the South East , my panels output was broadly similar to 21 Dec when the sun was at high noon due South, when also at 13 deg. So there is no great difference as to the direction from which the sun is shining, but all about the angle the sun hits your panels.

    The following link is very useful - https://www.timeanddate.com/sun/ireland/dublin?month=2&year=2020


  • Registered Users Posts: 1,840 ✭✭✭ garo


    Yeah good link. The orientation does matter depending on your panel tilt. Shallower tilts make orientation less relevant.

    PS: Best day so far. Already at 12kWh at 1650 for a 4.8kW E/W system.


  • Registered Users Posts: 5,201 ✭✭✭ championc


    garo wrote: »
    Yeah good link. The orientation does matter depending on your panel tilt. Shallower tilts make orientation less relevant.

    PS: Best day so far. Already at 12kW at 1650 for a 4.8kW E/W system.

    Me too - I'm at 8.92kw @ 17:00 for 2.7kw South Facing


  • Registered Users Posts: 85 ✭✭ Winterman1234


    Best day yet here also(installed 31st of January), 6.4kWh from a 2.5kW system facing S-SE located Donegal


  • Closed Accounts Posts: 3,364 ✭✭✭ rolion


    AND...happy harvesting to all of you, days longer, Sun waking up higher and happier on the sky...

    Today, got 14.9KWh closing in the 12.9MWh ;)
    PV diverter, injected in the cylinder a mere 8KWh.

    504051.jpg


  • Registered Users Posts: 27 eamon_l


    2.7kWh produced do far today despite the storm warnings. South Dublin, 4.2kWh system east/west split (4/10). Very happy since my system was reconfigured.


  • Closed Accounts Posts: 18,961 ✭✭✭✭ Shefwedfan


    Those with givenergy, is the website down? I cant get on since Thursday


  • Registered Users Posts: 5,201 ✭✭✭ championc


    championc wrote: »
    January - 75kw

    2.7kw South Facing - South Dublin - 22 deg slope

    February - 121.55kw


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  • Registered Users Posts: 85 ✭✭ Winterman1234


    2.5kw south east facing donegal

    February Generation -82 kWh
    Grid consumption - 127kWh
    Hot Water(Eddi) - 38kWh


  • Registered Users Posts: 1,478 ✭✭✭ MAULBROOK


    MAULBROOK wrote: »
    System 4.8kw SE north Wexford

    2020
    Jan 130.6 kw

    2019
    December 94 kw
    November 120.8 kw

    Getting 3 more panels added at the end of Feb.
    The company are adding them for nothing as a thank you for some good sales leads.

    South East in north Wexford.
    6.2kw (up graded from 4.8kw on feb 25)
    Feb 249.5kw generated


  • Registered Users Posts: 405 ✭✭ handpref


    Shefwedfan wrote: »
    Those with givenergy, is the website down? I cant get on since Thursday

    It’s been down all right, back up as of this morning.

    February -160 generated
    5.4 east west


  • Registered Users Posts: 12,242 ✭✭✭✭ joujoujou


    SSW facing 4.3 kW, Mayo/Roscommon border.

    157.7 kWh in February.

    Worst daily yield - 0.9 kWh on 7th.

    Best daily yield - 15.8 kWh on 27th.

    Average - approx. 5.44 kWh per day.


  • Registered Users Posts: 1,840 ✭✭✭ garo


    February
    Expected 143
    Actual 165
    4.8 kW E/W 24 degree tilt


    Good month to make up for the poor Jan. March expected is 291 so we’re really starting to ramp up now.


  • Registered Users Posts: 1,226 ✭✭✭ Valhallapt


    504283.png
    Screenshot 2020-03-01 at 09.17.41.png

    219.9Kw For February from 5.4Kw SSW panels in Kildare


  • Registered Users Posts: 27 eamon_l


    102kWh produced since the 14th Feb when my system was reconfigured. 4.2 kWh system on an East/West uneven split


  • Closed Accounts Posts: 18,961 ✭✭✭✭ Shefwedfan


    255.1 generated in Feb
    175.2kWh battery throughput
    1107.60kWh House Consumption
    71.3kWh exported to the grid
    965.5 Grid import


  • Moderators, Society & Culture Moderators Posts: 31,953 Mod ✭✭✭✭ Gumbo


    Gumbo wrote: »
    3kW system in Dublin 11.
    South facing.

    Jan 2020 - 114.18 kWh generated.

    Feb : 171.33 kWh generated.


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  • Moderators, Category Moderators, Motoring & Transport Moderators, Regional East Moderators Posts: 59,685 CMod ✭✭✭✭ unkel


    Shefwedfan wrote: »
    1107.60kWh House Consumption

    :eek:

    That is 4 times as much electricity use as the national average!

    "Wind is Ireland's oil" - An Taoiseach, 25/05/2022



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