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Solar PV battery options

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Comments

  • #2762
    the_amazing_raisin
    Registered Users, Registered Users 2, Paid Member Posts: 13,371 ✭✭✭✭the_amazing_raisin


    https://www.boards.ie/discussion/comment/119793376#Comment_119793376

    Ah what could go wrong 😉

    Seriously though, don't do it! 😱

    "The internet never fails to misremember" - Sebastian Ruiz, aka Frost



  • #2763
    Mr Q
    Registered Users, Registered Users 2 Posts: 1,086 ✭✭✭Mr Q


    https://www.boards.ie/discussion/comment/119793154#Comment_119793154

    They're expensive in my view. I purchased some from Alibaba earlier this year and they were about 50 euro per cell less than that with customs, delivery etc.

    Obviously USD rates have changed since then but not by that amount.



  • #2764
    the_amazing_raisin
    Registered Users, Registered Users 2, Paid Member Posts: 13,371 ✭✭✭✭the_amazing_raisin


    https://www.boards.ie/discussion/comment/119796289#Comment_119796289

    I agree, but battery prices seem to have shot up in the past few months, so earlier this year might as well be last century

    For comparison PWOD seem to be €1k more for what appears to be the same cells (no idea since they don't list manufacturers)

    I know OYE might be cheaper but I'm not quite willing to roll the dice given a few people have had bad experiences. I'm a bit more willing to take chances with an EU seller since I have some basic buyer protection at least

    "The internet never fails to misremember" - Sebastian Ruiz, aka Frost



  • #2765
    championc
    Registered Users, Registered Users 2 Posts: 6,564 ✭✭✭championc


    The CALB,'s from PWOD have only changed by the Dollar exchange rate swing all year. Yes, a few 100 for 16 cells, but that's all



  • #2766
    the_amazing_raisin
    Registered Users, Registered Users 2, Paid Member Posts: 13,371 ✭✭✭✭the_amazing_raisin


    https://www.boards.ie/discussion/comment/119797634#Comment_119797634

    But those are 200Ah cells, it's currently about €2k for 16 of those from AliExpress

    The ones I posted are 280Ah x16 cells for ~€2,900

    So it's around €10 per Ah regardless, don't see how it's a bad deal...

    "The internet never fails to misremember" - Sebastian Ruiz, aka Frost



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  • #2767
    championc
    Registered Users, Registered Users 2 Posts: 6,564 ✭✭✭championc


    So the 200ah are listed at €1870 right now, which is about €1550 after removing the VAT at the checkout - so €1550 delivered to your doorstep.

    200AH 3.2V Lifepo4 Battery DIY 12V 24V 48V High Capacity Lithium Iron Phosphate Cell for RV Vans Home Solar Off Grid System

    https://a.aliexpress.com/_msr02hE



  • #2768
    unkel
    Registered Users, Registered Users 2 Posts: 60,160 ✭✭✭✭unkel


    A good bit less capacity but a good bit more quality for roughly the same money. I'm all about value for money but in this case I would pick the CALBS. I'd say they have higher resale value too. Not that you are thinking about that now, but it is quite possible you will. I bought my first 10kWh of them in late 2019 and less than 18 months later I bought a new batch of 20kWh and sold my first batch. For more than they cost me new.

    "Make no mistake. The days of the internal combustion engine are definitely numbered" - Quentin Willson, 1997



  • #2769
    ELM327
    Registered Users, Registered Users 2, Paid Member Posts: 19,496 ✭✭✭✭ELM327


    Asking a very stupid question but it doesnt make sense to me and some googling doesnt help.

    How do you know the capacity? It's 3.2v? Surely it needs to be 48-52v?



  • #2770
    E30M3
    Registered Users, Registered Users 2 Posts: 329 ✭✭E30M3


    https://www.boards.ie/discussion/comment/119798942#Comment_119798942

    3.2 V X 16 Cells



  • #2771
    ELM327
    Registered Users, Registered Users 2, Paid Member Posts: 19,496 ✭✭✭✭ELM327


    See I knew it was something stupid and I knew there would be some series involved.

    So do you just assume they are 16 cells?



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  • #2772
    E30M3
    Registered Users, Registered Users 2 Posts: 329 ✭✭E30M3


    https://www.boards.ie/discussion/comment/119798979#Comment_119798979

    15 or 16 depending on the Battery and BMS configuration.



  • #2773
    unkel
    Registered Users, Registered Users 2 Posts: 60,160 ✭✭✭✭unkel


    The capacity of what?

    One CALB cell has a capacity of 200A (and is 3.2V nominal), a pouch cell as used in a Pylontech is also 3.2V nominal - all LiFePO4 cells are - and has a capacity of 25Ah

    If you put battery cells in series, the voltage increases, but the capacity stays the same. Examples:

    1. The famous DIY 10kWh pack that many people in this forum built. It uses 16 cells in series (16S1P), so has a capacity of 200Ah and a nominal voltage of 16*3.2 = 51.2V. The pack has a capacity of 51.2*200 = 10.24kWh
    2. A Pylontech US2000 which is a very popular proprietary pack in Ireland. It uses 15 cells in series and 2 in parallel (15S2P) of 25Ah pouches. So the pack has a nominal voltage of 15*3.2 = 48V and the capacity is 15*2*25*3.2=2.4kWh


    Hope that helps!

    "Make no mistake. The days of the internal combustion engine are definitely numbered" - Quentin Willson, 1997



  • #2774
    Galego
    Registered Users, Registered Users 2 Posts: 1,254 ✭✭✭Galego


    Question for the experters.

    Is there need to install a fused isolator between a Pylontech battery and a solis (or any) inverter?

    Someones is telling me "the manufacturer instructions show they need external short cct protection, and it's the easiest way of getting the fuses installed, and no more expensive as a fuse carrier only than as a fused isolator"

    I thought I just had to plug in the battery to the inverter and off you go!



  • #2775
    Mr Q
    Registered Users, Registered Users 2 Posts: 1,086 ✭✭✭Mr Q


    https://www.boards.ie/discussion/comment/119797068#Comment_119797068

    Mine came from China but I have got emails since then saying they have EU stock now in Poland. 294USD per box of 2 batteries including all costs was the last price I seen.

    They are listing them as 111euro a piece from China before other costs.



  • #2776
    unkel
    Registered Users, Registered Users 2 Posts: 60,160 ✭✭✭✭unkel


    https://www.boards.ie/discussion/comment/119799439#Comment_119799439

    I'm no electrician, but any cable coming from the positive terminal of any battery, should have a fuse imho


    (That said, there is probably a fuse on the positive terminal inside the Pylontech, can't remember. But I'd put one in the cable anyway)

    "Make no mistake. The days of the internal combustion engine are definitely numbered" - Quentin Willson, 1997



  • #2777
    Geeyfds53573
    Registered Users, Registered Users 2 Posts: 360 ✭✭Geeyfds53573


    Another 16 on the way

    €1421.72 today from PWOD

    € 475,37 32％ Off | 3.2V 200AH LiFePO4 Rechargeable Lithium Iron Phosphate Battery Pack For Golf Cart RV Boat Solar Battery Energy Storage System

    https://a.aliexpress.com/_mrupNYg



  • #2778
    graememk
    Moderators, Home & Garden Moderators Posts: 7,305 Mod ✭✭✭✭graememk


    https://www.boards.ie/discussion/comment/119859651#Comment_119859651

    Dont forget bus bars!



  • #2779
    unkel
    Registered Users, Registered Users 2 Posts: 60,160 ✭✭✭✭unkel


    That's not a bad price these days, but when I click on it I get just under €3000 (before VAT) for 32?

    "Make no mistake. The days of the internal combustion engine are definitely numbered" - Quentin Willson, 1997



  • #2780
    Geeyfds53573
    Registered Users, Registered Users 2 Posts: 360 ✭✭Geeyfds53573


    https://www.boards.ie/discussion/comment/119859957#Comment_119859957

    Not too bad and I played all the games (-:



  • #2781
    JHet
    Registered Users, Registered Users 2 Posts: 525 ✭✭✭JHet


    Some decent prices today:

    image.png

    That's €1,794.20 for 14.4 kWh

    and €1,344.44 for the 10 kWh CALBs.

    image.png


    Post edited by JHet on


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  • #2782
    unkel
    Registered Users, Registered Users 2 Posts: 60,160 ✭✭✭✭unkel


    Sweet. Thanks @JHet. A good bit cheaper again than yesterday I think. Couldn't resist any longer, got myself another 16 😁

    "Make no mistake. The days of the internal combustion engine are definitely numbered" - Quentin Willson, 1997



  • #2783
    Geeyfds53573
    Registered Users, Registered Users 2 Posts: 360 ✭✭Geeyfds53573


    https://www.boards.ie/discussion/comment/119862946#Comment_119862946

    Now that is a great price - we’re they cheaper actually on the day?



  • #2784
    Geeyfds53573
    Registered Users, Registered Users 2 Posts: 360 ✭✭Geeyfds53573


    https://www.boards.ie/discussion/comment/119859887#Comment_119859887

    Good point will I need 16 more? PWOD store also?



  • #2785
    graememk
    Moderators, Home & Garden Moderators Posts: 7,305 Mod ✭✭✭✭graememk


    https://www.boards.ie/discussion/comment/119865091#Comment_119865091

    Yep 16 more.



  • #2786
    ECO_Mental
    Registered Users, Registered Users 2 Posts: 2,788 ✭✭✭ECO_Mental


    Hi

    I am doing some basic sums here on whether I would get a battery or not, but also it's for a thing in work where I am giving a presentation on my experience of my own PV system over the past year. I know most of the talk on here is DIY is the only solution but how much are commercial batteries. I have made some enquires but people are slow to get back with prices.

    How much would a 10 kWh or even a 20 kWh commercial system be, I have number in my head of around €10k to €15k...

    Thanks

    6.1kWp south facing, South of Cork City



  • #2787
    micks_address
    Registered Users, Registered Users 2 Posts: 9,495 ✭✭✭micks_address


    https://www.boards.ie/discussion/comment/119880835#Comment_119880835

    the givenergy 9.5kwh battery is listed here at 4192 sterling plus vat https://midsummerwholesale.co.uk/buy/giv-energy/giv-9-5-batt



  • #2788
    ECO_Mental
    Registered Users, Registered Users 2 Posts: 2,788 ✭✭✭ECO_Mental


    https://www.boards.ie/discussion/comment/119880897#Comment_119880897

    Need to get that fitted and set up as well so another grand or two I suppose..

    6.1kWp south facing, South of Cork City



  • #2789
    micks_address
    Registered Users, Registered Users 2 Posts: 9,495 ✭✭✭micks_address


    yeah and what im not sure of.. does say the givenergy battery work with any invertor? mine came as a package deal with hybrid invertor/battery/panels



  • #2790
    graememk
    Moderators, Home & Garden Moderators Posts: 7,305 Mod ✭✭✭✭graememk


    https://www.boards.ie/discussion/comment/119880835#Comment_119880835

    I think 5kwh off the shelf batteries are coming in at 2-3k each.

    + Then getting a storage inverter/upgrading to a hybrid inverter

    The givenergy ones are actually 10kwh batteries "under the hood" but they allow discharge to 0% instead of stopping at the usual 20%



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  • #2791
    ECO_Mental
    Registered Users, Registered Users 2 Posts: 2,788 ✭✭✭ECO_Mental


    Here is a complete package 8kW inverter and 18.4 kW of storage £14,625 or around €16,500 eek! that's not even fitted or delivered....

    As everyone says DIY is the way forward but just checking as not everybody is up to DIYing something like this....

    https://midsummerwholesale.co.uk/buy/storedge/solaredge-3ph-8k-bat-bundle


    6.1kWp south facing, South of Cork City



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