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How low can you go...Daily, Weekly, Monthly, Whatever... electricity grid import

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mickyduck55
mickyduck55 Posts: 655 Forumite
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edited 4 October 2021 at 5:04PM in Green & ethical MoneySaving


It has been the first week of the year when I have had little or no import from the grid so I am creating this thread so we can brag about how little energy we import in a week. I was surprised at this low figure as we were not deliberately time shifting energy usage.  It has been a normal week with cooking, baking , washing, dishwasher and showering (I did convince my better half to use the power shower instead of the 10 kW electric one as there was ample hot water heated by the immersion).

I think it will be difficult to get down to zero because of the inverter not being fast enough when certain electric appliances kick in and out causing some minor import, early morning toaster and kettle at the same time will require some import... so who will be the first to Zero ?
3.995kWP SSW facing. Commissioned 7 July 2011. 24 degree pitch (£3.36 /W).
17 Yingli 235 panels
Sunnyboy 4000TL inverter
Sunny Webox
Solar Immersion installed May 2013, after two Solar Immersion lasting just over the guarantee period replaced with Solic 200... no problems since.

13 Feb 2020 LUX AC 3600 and 3 X Pylon Tech 3.5 kW batteries added...

20 January 2024 Daikin ASHP installed
«13456718

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  • QrizB
    QrizB Posts: 13,822 Forumite
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    edited 23 April 2021 at 5:19PM
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    Wow and I though I was doing well by only importing 4kWh on Sunday! Congratulations on getting so low B)
    N. Hampshire, he/him. Octopus Go elec & Tracker gas / Shell BB / Lyca mobi. Ripple Kirk Hill member.
    2.72kWp PV facing SSW installed Jan 2012. 11 x 247w panels, 3.6kw inverter. 30MWh generated, long-term average 2.6 Os.
    Taking a break, hope to be back eventually.
    Ofgem cap table, Ofgem cap explainer. Economy 7 cap explainer. Gas vs E7 vs peak elec heating costs.
  • EVandPV
    EVandPV Posts: 2,109 Forumite
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    Can't beat your weekly figure Mick, that's seriously low !
    Closest we came to a zero import day was 21st March with 0.211kwh.



    Scott in Fife, 2.9kwp pv SSW facing, 2.7kw Fronius inverter installed Jan 2012 - 14.3kwh Seplos Mason battery storage with Lux ac controller - Renault Zoe 40kwh, Corsa-e 50kwh, Zappi EV charger and Octopus Go
  • mickyduck55
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    Lots of sun and biggish battery capacity...
    3.995kWP SSW facing. Commissioned 7 July 2011. 24 degree pitch (£3.36 /W).
    17 Yingli 235 panels
    Sunnyboy 4000TL inverter
    Sunny Webox
    Solar Immersion installed May 2013, after two Solar Immersion lasting just over the guarantee period replaced with Solic 200... no problems since.

    13 Feb 2020 LUX AC 3600 and 3 X Pylon Tech 3.5 kW batteries added...

    20 January 2024 Daikin ASHP installed
  • mickyduck55
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    QrizB said:
    Wow and I though I was doing well by only importing 4kW on Sunday! Congratulations on getting so low B)
    I guess you don't have a battery so its unlikely you will ever get that low.. I bought the battery because it irked me that I was pouring power out to the grid all day then had to buy it back in the evening when I came home / the sun went down.  I know its not a good ROI.. but I like the idea 

    3.995kWP SSW facing. Commissioned 7 July 2011. 24 degree pitch (£3.36 /W).
    17 Yingli 235 panels
    Sunnyboy 4000TL inverter
    Sunny Webox
    Solar Immersion installed May 2013, after two Solar Immersion lasting just over the guarantee period replaced with Solic 200... no problems since.

    13 Feb 2020 LUX AC 3600 and 3 X Pylon Tech 3.5 kW batteries added...

    20 January 2024 Daikin ASHP installed
  • Solarchaser
    Solarchaser Posts: 1,663 Forumite
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    Yeah im at 14kwh, for the week so this is something I can't compete in.
    The leccy shower is what kills it for me, its running 5 times a day on a normal day, so unless I can convince the family to shower when the sun is out (tried and failed) then it's not gonna happen.

    I suppose the silver lining is that it's 2kw a day from an average usage of 30kwh a day (not sure why it's so high, it's usually 20-25kwh a day) so the solar +batts is working well.

    Just need to fit hot water tank and ditch the leccy showers 
    West central Scotland
    4kw sse since 2014 and 6.6kw wsw / ene split since 2019
    24kwh leaf, 75Kwh Tesla and Lux 3600 with 60Kwh storage
  • mickyduck55
    mickyduck55 Posts: 655 Forumite
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    A little effort this week time shifting so kettle and toaster not on together and zero 10 kWh electric showers, we used the power shower and the solar heated water via the Solic

    Total generation for the week 166.87 kWh  :)



    3.995kWP SSW facing. Commissioned 7 July 2011. 24 degree pitch (£3.36 /W).
    17 Yingli 235 panels
    Sunnyboy 4000TL inverter
    Sunny Webox
    Solar Immersion installed May 2013, after two Solar Immersion lasting just over the guarantee period replaced with Solic 200... no problems since.

    13 Feb 2020 LUX AC 3600 and 3 X Pylon Tech 3.5 kW batteries added...

    20 January 2024 Daikin ASHP installed
  • michaels
    michaels Posts: 28,100 Forumite
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    WE use about as much in a week as you do in a month and I thought our house was quite electricity efficient so I have no idea how you do it.
    I think....
  • QrizB
    QrizB Posts: 13,822 Forumite
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    edited 5 October 2021 at 8:08PM
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    michaels said:
    WE use about as much in a week as you do in a month and I thought our house was quite electricity efficient so I have no idea how you do it.
    It's odd, I look at mickyduck and think the same - how does he do it? Then I see he's got ~4kWp of PV and 10kWh of batteries, vs. my ~2.7kW and (until recently) 1.2kWh of battery.
    December will be when we see how much energy we need in the dark and cold ;)
    N. Hampshire, he/him. Octopus Go elec & Tracker gas / Shell BB / Lyca mobi. Ripple Kirk Hill member.
    2.72kWp PV facing SSW installed Jan 2012. 11 x 247w panels, 3.6kw inverter. 30MWh generated, long-term average 2.6 Os.
    Taking a break, hope to be back eventually.
    Ofgem cap table, Ofgem cap explainer. Economy 7 cap explainer. Gas vs E7 vs peak elec heating costs.
  • greyteam1959
    greyteam1959 Posts: 4,589 Forumite
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    @QrizB
    How much did your battery setup cost ?
    If you don't mind me asking.

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