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    • CommentAuthorGarethC
    • CommentTimeJun 28th 2016
     
    What gubbins are needed for EVs to feed electricity back to the grid?

    Inverters at homes (and other charging stations?).

    Software so EVs know when to "buy" and "sell" (the latter up to a limit so they don't go flat).

    A way to measure when you bought and sold, and at what rates. Smart meter in the home? What if 'selling' at a remote station?

    Variable tarrifs. At least "low" (5p/kWh?), "normal" (15p/kWh), "high" (25p/kWh). Govt would probably want to limit the 'high' cost for social reasons.

    Anything else?
    •  
      CommentAuthorSteamyTea
    • CommentTimeJun 28th 2016
     
    Should there be a difference in price of you sell power to yourself as compared back to the grid for others to use. As far as the grid/DNO/Generation companies it should make no difference.
    Also how about regional differences. Why should someone in Cornwall not be able to charge a car at a cheap rate because some farmer is using power in the morning (there is a 40 minute solar time difference). Similarly, what if the next town to you has a large arc furnace that is trying to take advantage of cheap rate power, that will just flatten your batteries for you.
    • CommentAuthorGarethC
    • CommentTimeJun 29th 2016
     
    But if the electricity's at cheap rate, due to lots being generated by wind/solar etc. doubt cars would generally sell back during these periods.

    Trying to guesstimate how the ability to buy leccy cheap and sell high (say at my indicative rates) might affect the economics of EV ownership. i.e. what 'profit' might be realistic, and would it pay for the inverter etc, or make EV ownership generally more attractive.

    But I'm failing. Too many variables. I'll come back to this, but can anyone with more knowledge (low bar) come up with an answer in the meantime?
    • CommentAuthorringi
    • CommentTimeJun 29th 2016
     
    https://www.theguardian.com/environment/2016/jun/24/solar-battery-storage-bulk-buy-scheme-promises-lower-prices-sooner
    • CommentAuthorGarethC
    • CommentTimeJun 29th 2016
     
    And more questions! What happens when batteries get old? Is it just that they lose, say, 30% of their capacity? In which case, is battery degradation less of a problem for a battery with 200 miles initial range than one with 100 miles initial range, as the former delivers less range anxiety even when depleted?
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