Separating EV charging cost from household electricity costs
Discussion
I'm toying with the idea of a 2nd hand EV to replace my diesel daily, partly out of interest, partly because it's the future etc, etc. Cars I am considering need only 3.6kw, commute is 17 miles, first 2 in heavy town traffic, 14 on dual carriageway, last mile in heavy town traffic. Repeat in reverse on the way home.
I don't have charging at work so will need a charger at home. However, I'd like to keep the costs of charging the car separate from the other electricity costs of the household. From what I've seen most people seem to run their home charging from their consumer unit, meaning all energy is being run through the one meter.
So, is there a way to split out the cost of EV charging when using a home unit and retaining just one electricity meter (some kind of smart metering perhaps) or will it require a second meter to be installed in parallel with the first meter to give a true split supply and therefore two bills? Anybody done such a thing?
I don't have charging at work so will need a charger at home. However, I'd like to keep the costs of charging the car separate from the other electricity costs of the household. From what I've seen most people seem to run their home charging from their consumer unit, meaning all energy is being run through the one meter.
So, is there a way to split out the cost of EV charging when using a home unit and retaining just one electricity meter (some kind of smart metering perhaps) or will it require a second meter to be installed in parallel with the first meter to give a true split supply and therefore two bills? Anybody done such a thing?
You won't need a dedicated charger.
That sort of mileage will need something like 10kWhrs a day, under £20 a month (night rate).
Any electrician would be able to install a check meter for that circuit if you want to keep an eye on things.
Even an early Leaf with 8 or 9 bars will do the job easily.
That sort of mileage will need something like 10kWhrs a day, under £20 a month (night rate).
Any electrician would be able to install a check meter for that circuit if you want to keep an eye on things.
Even an early Leaf with 8 or 9 bars will do the job easily.
I’d like this too, don’t think it’s possible, I have given back my fuel card since having the 330e so I can take advantage of the hybrid side, claiming 14p a business mike currently. It would like to put let’s say £30 of that claim against the electric like I do with a separate credit card for fuel, my fear is it’s going to be lost and scooped up with just a higher monthly assessment on duel fuel usage in a few months.
caziques said:
You won't need a dedicated charger.
That sort of mileage will need something like 10kWhrs a day, under £20 a month (night rate).
Any electrician would be able to install a check meter for that circuit if you want to keep an eye on things.
Even an early Leaf with 8 or 9 bars will do the job easily.
Thanks. When you say I won't need a dedicated charger, do you mean that I could instead charge it from a 3 pin socket using a granny charger?That sort of mileage will need something like 10kWhrs a day, under £20 a month (night rate).
Any electrician would be able to install a check meter for that circuit if you want to keep an eye on things.
Even an early Leaf with 8 or 9 bars will do the job easily.
I don't have night rate electricity at the moment, just a standard rate per KWh irrespective of when it is consumed.
I didn't realise that check meters existed but presumably if wired as you suggest then it will tell me the number of units/kwh run through that circuit and it would then just be a case of resetting it to zero every time I took a meter reading? If yes, then I could retrospectively determine the number of units used for EV charging and then determine total cost using the pence per KWh of my tariff.
pherlopolus said:
Our wall charger counts the units, just won't generate a separate bill.
Depends if your company trusts a meter reading to refund you...
Thanks. Does your wall charger allow you to reset the counter? Or alternatively does it have an app that tells you the number of units used for a defined period, e.g. monthly. That could help with determining the EV charging cost when used in conjunction with a bill from the energy supplier. Depends if your company trusts a meter reading to refund you...
jonwm said:
I’d like this too, don’t think it’s possible, I have given back my fuel card since having the 330e so I can take advantage of the hybrid side, claiming 14p a business mike currently. It would like to put let’s say £30 of that claim against the electric like I do with a separate credit card for fuel, my fear is it’s going to be lost and scooped up with just a higher monthly assessment on duel fuel usage in a few months.
You can get a pretty good idea through BMWs digital charging portal- just log in and put your energy tariff in. This is mine for this month
James_G said:
pherlopolus said:
Our wall charger counts the units, just won't generate a separate bill.
Depends if your company trusts a meter reading to refund you...
Thanks. Does your wall charger allow you to reset the counter? Or alternatively does it have an app that tells you the number of units used for a defined period, e.g. monthly. That could help with determining the EV charging cost when used in conjunction with a bill from the energy supplier. Depends if your company trusts a meter reading to refund you...
craig1912 said:
jonwm said:
I’d like this too, don’t think it’s possible, I have given back my fuel card since having the 330e so I can take advantage of the hybrid side, claiming 14p a business mike currently. It would like to put let’s say £30 of that claim against the electric like I do with a separate credit card for fuel, my fear is it’s going to be lost and scooped up with just a higher monthly assessment on duel fuel usage in a few months.
You can get a pretty good idea through BMWs digital charging portal- just log in and put your energy tariff in. This is mine for this monthjonwm said:
I set this up on Friday after the advice given here so will check the stats, going to ring my supplier on Tuesday to see if I can make a one of payments on the account every month rather than increasing the DD
Just out of interest - if your using the 3-pin granny cable at home... then could you not get one of those plug in energy monitors to keep on the end of the plug? crude - but it should give an extra source of consumption when the bmw portal is being flakey.NeoVR said:
jonwm said:
I set this up on Friday after the advice given here so will check the stats, going to ring my supplier on Tuesday to see if I can make a one of payments on the account every month rather than increasing the DD
Just out of interest - if your using the 3-pin granny cable at home... then could you not get one of those plug in energy monitors to keep on the end of the plug? crude - but it should give an extra source of consumption when the bmw portal is being flakey.Gassing Station | EV and Alternative Fuels | Top of Page | What's New | My Stuff