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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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  • Theoretically - yes. Nothing should fail as long as both are wired and protected to handle the currents as they occur individually. Grid battery storage does the same thing. Don't think the battery gets "empty" tho.  

    Your electricity cost must be absolutely outrageous if you save money using battery storage and only connecting utility grid at night , unless you omitted having daytime solar charging system. Your car does have a plug, so there is control when you charge it up. 

  • in reply to robogary

    As I say, I don’t have control over when the car charges, it is a schedule set by my utility company based on some algorithm they have otherwise I would just schedule accordingly. The 16kW house battery is just part of the overall system. 

    But I’m interested in my question: I think the outcome will be either a net pull from the grid, or the battery just won’t discharge. 

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  • in reply to robogary

    As I say, I don’t have control over when the car charges, it is a schedule set by my utility company based on some algorithm they have otherwise I would just schedule accordingly. The 16kW house battery is just part of the overall system. 

    But I’m interested in my question: I think the outcome will be either a net pull from the grid, or the battery just won’t discharge. 

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