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What is likely to happen, if anything, if I try and export to the grid and import from the grid simultaneously?

Andrew J

I have this scenario:  I want to export from a house battery to the grid during the period 23:30 to 01:00 at 3.6kW (until battery is empty.)  At the same time, I have my car plugged in charging at 7kW.  Would that have the net effect of pulling 3.4kW from the grid?  Is anything likely to fail?

As a basic summary, I can charge my house battery up at 7p from 23:30 to 05:30 and discharge it to the house during the rest of the day, thus I pay only 7p for electricity used.  I don't fully discharge the battery during this period so I can sell the remaining charge back to the grid at 15p before fully charging up again ready for the day.  However, I also need to charge my car up which I also do 23:30 to 05:30 - Note because of the tariff I am on I have NO control over when the charging actually occurs so I cannot configure it to avoid the time period where the house battery is discharging.  Re-configuring the battery to not discharge when I plug the car in is a laborious process which I want to avoid.  I only actually charge the car once or twice a week.

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  • first I live across the pond so I will ask the first question: what is, and how is the 'grid' paying you??

    this is rather important as my grid pays me per Kw at the same price they charge me. So it work out nice ie. if I draw 3 Kw and generate 5 Kw they pay for 3 Kw only. When i move into my new digs I bringing in 3 phase for the shop, etc. I take 2 legs for 220/110 and that where the switch  will be since they are looking at total load on the 3 phase any I generate on the back end gets credit. 

    I don't have times, or high/load times so I don't worry about it but you might have to. do you have different rates for different time of the day / night?

    . 

  • in reply to phoenixcomm

    Yes, £0.07 23:30 to 05:30 and £0.27 05:30 to 23:30. I can export at £0.15. The grid is just what we call the national electricity infrastructure here. The battery I have has the capacity to support the house between 05:30 to 23:30 with charge still remaining. So I basically pay £0.07 for all my electric. Any excess I can sell back at £0.08 profit (I expect to be a millionaire any day now Grinning). However, once late autumn and winter roll around my ASHP will consume a lot more and I expect to pull on the grid at the higher price. 

  • in reply to Andrew J

    Your £0.15 rate is cheap! I pay about $0.15/Kw flat + $8.00 service fee, But he, he, I don't sell we trade Kw used == Kw supplied!!  So if I use 2kw and give them 2.kw its free ( plus the service fee which I have to pay..)  but sadly I live in an Apartment currently so I am currently looking for something in my service area! 

  • in reply to phoenixcomm

    The standard rate for import between 05:30 and 23:30 is £0.277 so I’m pretty much getting electric for 25% of that.  I also have to pay something like £0.47 a day as a service charge.  You may think £0.15 for export is cheap but it’s about the best on the market - some utility companies are paying as little as £0.01!  
    Electricity in the UK is very expensive compared to the rest of Europe (the world) because its price is pegged to the price of coal and gas plus a surcharge for green investment.

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  • in reply to phoenixcomm

    The standard rate for import between 05:30 and 23:30 is £0.277 so I’m pretty much getting electric for 25% of that.  I also have to pay something like £0.47 a day as a service charge.  You may think £0.15 for export is cheap but it’s about the best on the market - some utility companies are paying as little as £0.01!  
    Electricity in the UK is very expensive compared to the rest of Europe (the world) because its price is pegged to the price of coal and gas plus a surcharge for green investment.

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