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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

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Renewable Energy: PV energy storage

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1 to 13 of 13

  1.  
    • CommentAuthorowlman
    • CommentTimeNov 17th 2014
     
    Interesting no? Anyone got any experience?
    http://www.samsungsdi.com/ess/residential-commercial-solution
    • CommentAuthorEd Davies
    • CommentTimeNov 17th 2014
     
    I only know of people doing this sort of thing for themselves but there are other commercial versions available - Navitron do one for example.

    It's interesting that this one claims to be able to provide power during a power cut - I assume that means that it has to go in series with the house (or at least the house circuits it's to power) otherwise it wouldn't be able to avoid power leaking to the grid in a power cut which is considered rather naughty. Does that mean that it wouldn't, therefore, be able to contribute energy harvested from PV in the afternoon towards evening cooking?
    •  
      CommentAuthorSteamyTea
    • CommentTimeNov 17th 2014
     
    Oh
    More batteries :wink:
    Never trust a graph without a scale.

    Here is mine for the weekend, its not like theirs.
    • CommentAuthorowlman
    • CommentTimeNov 17th 2014
     
    Are you nocturnal Steamy? you seem to be doing most of your living at Sparrer Fart.:bigsmile::wink:
    • CommentAuthorgravelld
    • CommentTimeNov 17th 2014
     
    That's either the immersion coil or the world's largest cup of tea.
    • CommentAuthorskyewright
    • CommentTimeNov 17th 2014
     
    Posted By: owlmanAre you nocturnal Steamy? you seem to be doing most of your living at Sparrer Fart.

    Might that be the E7 storage heating? If so I don't imagine that's quite the sort of use the PV energy storage people had in mind...
    •  
      CommentAuthorSteamyTea
    • CommentTimeNov 17th 2014
     
    Yes, the big peak is the E7 Water heating and the smaller ones are the washing machine.
    It does highlight a problem with storage, not everyone uses standard rate electricity, and we are being 'encouraged' to use off peak.
    • CommentAuthorowlman
    • CommentTimeNov 17th 2014
     
    That's a relief ST; I thought all those gargantuan early morning fry ups can't be doing your arteries any good at all.:wink:
    • CommentAuthorEd Davies
    • CommentTimeNov 17th 2014
     
    But Steamy, that's not actually a graph of your usage - more a graph of when you collect the energy. It's more analogous to the PV curve in the original graph, just 180° out of phase in the diurnal cycle.
    •  
      CommentAuthorSteamyTea
    • CommentTimeNov 17th 2014
     
    The main point I was making is that they used a graph without any scale, so it tells us nothing.
    This is only another battery storage system, no magic in it.
    And I bet it costs more than £1000 installed, the price I put on 5kWh of storage to be viable on another thread.
    • CommentAuthorringi
    • CommentTimeNov 17th 2014
     
    What if a storage system could turn on a heat pump when it had enough power stored for the pump to run…. Likewise washing machine…

    If I lived in the USA and hence had power cuts many times a year, then I would more see the point of having just enough storage to keep the lights on. Otherwise the price would have to come down a lot.
    • CommentAuthorEd Davies
    • CommentTimeNov 17th 2014
     
    “The main point I was making is that they used a graph without any scale, so it tells us nothing.â€Â

    But it's just an illustration pointing out the general pattern that generation and use happen at different times with PV in a typical household. Trying to be more specific would be a bit ridiculous, I'd think, though I'm intrigued to know how they transfer energy back in time from the day-time PV peak to the morning usage peak :wink:
    •  
      CommentAuthorSteamyTea
    • CommentTimeNov 17th 2014
     
    I wonder what a good price would be, grid power is around 12p/kWh, what are PV FITs, 15p/kWh.
    So if the batteries can last 5 years and the use a third of their capacity a day, that will be about 450 kWh/year for a 3.6 kWh system, or 2200 kWh in total.
    In cash terms it needs to be between £270 and £350.
    The real competitor is a stand by generator, not sure how much one that can start (and isolate the building) on a power cut would cost.

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