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Home attached battery storage solution

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Comments

  • #92
    Muahahaha
    Registered Users, Registered Users 2 Posts: 19,760 ✭✭✭✭Muahahaha


    Sir Liamalot wrote: »

    The battery efficiency is only one third.
    The inverter efficiency and the charger efficiency must be factored.

    No battery, no charger = lot's better.
    Batteries can not compete with utility power on cost in any consumer goods configuration.

    so if you set it up to charge on night time electricty you would lose almost 70% of the electricity :confused: Sounds pretty pointless then if thats the case, the battery would likely be dead before you come near re-couping the costs of it. Is 30% efficiency as good as it gets with batteries or is it possible that it will improve to 80 or 90% over time?


  • #93
    [Deleted User]
    Posts: 5,238 ✭✭✭ [Deleted User]


    one third of the losses. Batteries are between 0% and 95% efficient depending on flavour and service histroy. Inverters typically 85% chargers typically 80%, DC charge controllers > 95%.
    These are measured figures not datasheet cherry picking.

    So import lecky at half price. Lose about ~20 - 30% in power converter heat sinks.
    Most batteries don't pay for themselves, unless your remote power provider is comparatively more expensive.
    Will it improve?

    Flow batteries are interesting as are carbon based.
    Mechanical batteries have serviceable parts so things like pumped hydro at 80% efficient beats a lottov alternatives over it's lifetime.

    Let the ESB worry about storage, offsettting import is the best we can do and we can do a lot with that.


  • #94
    Muahahaha
    Registered Users, Registered Users 2 Posts: 19,760 ✭✭✭✭Muahahaha


    ah right that explains it better. Seems like unless you get a cheap second hand battery and do the install yourself then the cost-benefit doesnt really stack up.


  • #95
    [Deleted User]
    Posts: 5,238 ✭✭✭ [Deleted User]


    Not even then, I have done and it's a back-up system.
    Beats a diesel from here to Sunday.

    High amperage DC switchgear and control gear ain't cheap. Scrutinise system cost, not battery cost.


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