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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.

PLEASE NOTE: A download link for Volume 1 will be sent to you by email and Volume 2 will be sent to you by post as a book.
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Products: Home Battery v. EV

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  1.  
    • CommentAuthorRobinB
    • CommentTimeAug 23rd 2023
     
    Been looking at quote for 6kWh home battery to add to our PV setup - circa £6k installed.

    Tangentially I'm considering a 60kWh vehicle (BYD Dolphin if you're wondering) with a ticket price of £31k and V2L (vehicle to load) facility.

    So the car has 10x capacity of home battery and V2L functionality for only 5x the price? Plus I'd have a car. Can I just have a car?

    Hmm. What am I missing? How will UK utilities handle V2L? Might I need a home battery as a staging post?
    •  
      CommentAuthordjh
    • CommentTimeAug 23rd 2023 edited
     
    Posted By: RobinBHow will UK utilities handle V2L?
    They won't; they don't need to. V2L is vehicle-to-load, not vehicle-to-grid (V2G). V2L means you can plug an appliance into the car, such as a kettle or an electric drill, not that you can plug your house into it.
    • CommentAuthorphiledge
    • CommentTimeAug 24th 2023
     
    Posted By: RobinBWhat am I missing? How will UK utilities handle V2L? Might I need a home battery as a staging post?


    As djh has said, V2L is an off grid feature for camping, remote working etc and not intended to be connected or potentially connected to the grid. If you disconnect your house from the grid then there's no reason you can't plug your house into the car, but the house needs to be disconnected from the grid with an interlocked changeover switch to ensure your car powered house cant be connected to the grid. Not sure what your cars V2L is rated at but worth checking your V2L output will meet the house demand if you go to plug the house into the car.

    If youve already got PV and possibly used up your 3.68kw/16amp G98 allowance, youd likely need to apply to your DNO for permission to connect an AC coupled battery whether its standalone or in the car. A DC coupled battery connected and output restricted through your PV inverter wouldnt be a problem as you keep your potential export within the limits of what youve already got, assuming what youve already got is legit!
    • CommentAuthorrevor
    • CommentTimeAug 24th 2023
     
    Posted By: RobinBBeen looking at quote for 6kWh home battery to add to our PV setup - circa £6k installed.

    Bit steep for 6Kw. Was quoted £9950 for Tessla 2 plus gateway that is 13.5 Kw fitted just last week at a show. My current 10kw battery was about £5500 3 years ago
    As DJH states it is vehicle to load usually max is 16Amps or thereabouts maybe 13. I think there would be a way of powering part of your your house if you limited to what the EV battery can supply. You could select some low powered favoured circuits and put them on a small consumer unit. Before this a changeover switch into which on one side you would wire in the feed from EV battery and the other side from your existing consumer unit suitably protected. In power cut you would switch over. Hasten to add I am not a qualified sparky but suitably p registered sparky could rig something along these lines quite quickly. the components would be affordable. Or just run an extension lead to boil the kettle drive the telly etc. Ideal situation is have both but I would go for a bigger battery than 6kwh as you only get about 75 to 80% actually workable.
  5.  
    "The V2L adapter that comes with the Dolphin can be plugged into the type 2 AC port providing up to 2.2 kW of continuous power to appliances."
    https://zecar.com/resources/byd-dolphin-charging-guide

    2.2kW is enough for lights and gadgets, but usually not enough for cooking or kettles. Handy for camping trips though!

    Doesn't sound like it is intended for feeding a fixed installation such as a house, so likely it doesn't have safety type approval to do that. In which case is doubtful that it would comply with UK wiring regs to 'rig something up' that the manufacturer didn't intend it for, so wouldn't meet building regs or insurance.


    AIUI 'V2L' is a little AC inverter that comes with the car, similar to the ones caravans use for a kW or two, no wall box is needed. Whereas for "V2G" the power is drawn out of the car via the DC charging connector (capable of many kW) and then converted to AC by the wall box (so the wall box needs grid safety approvals).

    Also AIUI, of the two kinds of DC connectors, only Chademo has agreed international standards for bi directional power flow. The other kind of plug, CCS, is more common on new cars and is planned to have bi directional standards agreed from 2025. Some manufacturers are taking a punt ahead of the standards being agreed, others are hanging back. Anyone know more about this?
    • CommentAuthorrevor
    • CommentTimeAug 24th 2023
     
    Posted By: WillInAberdeenDoesn't sound like it is intended for feeding a fixed installation such as a house, so likely it doesn't have safety type approval to do that. In which case is doubtful that it would comply with UK wiring regs to 'rig something up' that the manufacturer didn't intend it for, so wouldn't meet building regs or insurance.


    Valid point an electrician would be able to advise I am sure. Don't think what I have suggested is any different to running an extension lead with several outlets which some will be tempted to do no doubt. Each hard wired outlet coming out of a consumer unit with breakers and RCD I think would be safer. Think the Kia EVs with V2L will supply 3.5kw certainly the EV6 does.

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