Discussion
Is there any way to see how much power is being drawn during charging on these? Currently trying to work out if it's worth switching to an EV charging tariff - we do around 6k miles a year, think we're charging the car about once every ten days roughly (from around 20% to 90%) but we both work from home so we're using stuff like computers and monitors, the kettle and other kitchen stuff etc. every day. I'm not certain that we charge the car enough that doing that overnight on an EV tariff would offset the increased cost from the higher electricity unit charge during the daytimes.
Alternatively, if there's no way to determine that from the car itself then would a smart meter help us work that out?
Alternatively, if there's no way to determine that from the car itself then would a smart meter help us work that out?
pills said:
8Bit, what type of charger are you using? A smart charger should be able to give this information.
It's a Hypervolt of some sort - that's a good shout, I don't have the app on my phone (it's on the wife's phone) so it never occurred to me to look at that, will investigate.61kWh battery so 20-90% very 10 days would be around 130kW per month (43kW per charge). Add 10-15% for charging losses and your at 3.3 miles/kWh on average from charger to road and 150kW in total used.
Assuming a 20p per kW reduction in costs on an EV tariff versus standard that's £30 a month saved on charging costs for your usage.
Ballpark numbers of course.
Assuming a 20p per kW reduction in costs on an EV tariff versus standard that's £30 a month saved on charging costs for your usage.
Ballpark numbers of course.
SWoll said:
61kWh battery so 20-90% very 10 days would be around 130kW per month (43kW per charge). Add 10-15% for charging losses and your at 3.3 miles/kWh on average from charger to road and 150kW in total used.
Assuming a 20p per kW reduction in costs on an EV tariff versus standard that's £30 a month saved on charging costs for your usage.
Ballpark numbers of course.
Tremendous, thanks for that! Ours has a 69kWh battery according to the sticker on the door so using your working (and assuming I've followed you correctly) that's about 166W over the month including charging losses, or 2000kW per year. I can work out what proportion of our annual electricity usage that leaves from there.Assuming a 20p per kW reduction in costs on an EV tariff versus standard that's £30 a month saved on charging costs for your usage.
Ballpark numbers of course.
8bit said:
SWoll said:
61kWh battery so 20-90% very 10 days would be around 130kW per month (43kW per charge). Add 10-15% for charging losses and your at 3.3 miles/kWh on average from charger to road and 150kW in total used.
Assuming a 20p per kW reduction in costs on an EV tariff versus standard that's £30 a month saved on charging costs for your usage.
Ballpark numbers of course.
Tremendous, thanks for that! Ours has a 69kWh battery according to the sticker on the door so using your working (and assuming I've followed you correctly) that's about 166W over the month including charging losses, or 2000kW per year. I can work out what proportion of our annual electricity usage that leaves from there.Assuming a 20p per kW reduction in costs on an EV tariff versus standard that's £30 a month saved on charging costs for your usage.
Ballpark numbers of course.
It's an interesting one to calculate and will swing quite a bit dependent on time of year, how much of your household usage you can push into the cheap period and what tariff you choose. All I would add is that your mileage is pretty limited so savings either way are going to be minimal at a guess.
SWoll said:
Apologies, dodgy info from google it would appear (earlier model perhaps). So 69kW with 67kW useable which alters the maths a bit but not by a huge amount.
It's an interesting one to calculate and will swing quite a bit dependent on time of year, how much of your household usage you can push into the cheap period and what tariff you choose. All I would add is that your mileage is pretty limited so savings either way are going to be minimal at a guess.
No worries, yeah the battery spec has changed a few times over the years. Your last point sums it up though, we're probably well below average mileage on the EV and both work from home so most of what we can push into the off-peak hours would be the car, washing machine and possibly the dishwasher.It's an interesting one to calculate and will swing quite a bit dependent on time of year, how much of your household usage you can push into the cheap period and what tariff you choose. All I would add is that your mileage is pretty limited so savings either way are going to be minimal at a guess.
Update on the above, based on 6k miles a year and assuming that about the only thing drawing power overnight was the EV charger we'd be about £300 worse off moving from our standard Flexible Octopus regular tariff to an EV tariff. Break-even seems to be if we doubled the EV mileage/charging.
Absolutely it’s worth running the numbers. I’m in a similar situation, due to not having any regular pattern to charging, and relatively low mileage, I’m actually better off using Octopus Tracker tariff (averaging about 20ppkWh) rather than Octopus Intelligent or Go which have cheap periods. Simply because most of my energy usage is during the peak period, it’s not mitigated by the amount in off peak.
8bit said:
Update on the above, based on 6k miles a year and assuming that about the only thing drawing power overnight was the EV charger we'd be about £300 worse off moving from our standard Flexible Octopus regular tariff to an EV tariff. Break-even seems to be if we doubled the EV mileage/charging.
Or shift some of your normal load to the cheap overnight rate. We run our washing machine and dishwasher during the low rate, for example.Switching from Octopus Flexible to Octopus Go, and "load-shifting" the immersion heater, dishwasher, washing machine and dryer to overnight, means my car charging is almost free. DD of £150 to cover Flexible, increased to £155 to cover Go.
Plug-in hybrid, charged 4 times a week using a granny charger, so around 4000 electric miles per year for a £60 increase in bills - 1.5p per mile.
Plug-in hybrid, charged 4 times a week using a granny charger, so around 4000 electric miles per year for a £60 increase in bills - 1.5p per mile.
escargot said:
8bit said:
Update on the above, based on 6k miles a year and assuming that about the only thing drawing power overnight was the EV charger we'd be about £300 worse off moving from our standard Flexible Octopus regular tariff to an EV tariff. Break-even seems to be if we doubled the EV mileage/charging.
Or shift some of your normal load to the cheap overnight rate. We run our washing machine and dishwasher during the low rate, for example.8bit said:
Would the dishwasher and washing machine draw enough power to tip the numbers in favour of the flexible tariff though? We could run the dishwasher overnight without any problem but washing machine would be problematic, we have two young kids so it's often used more than once a day.
Depends how much power your dishwasher uses - our's uses a fair amount.The energy use spikes overnight, in these photos of our energy use, is our dishwasher operating
As you can see - we try and make maximum use of the off-peak time - P2 & Storage battery charging, along with the dishwasher, washing machine and a dehumidifier when the washing is drying..
Edited by SDK on Friday 1st December 14:14
John87 said:
My LRDM with all packs is around £570 per month for 12k miles and 3 years. I ordered last August and took delivery in July so possible changes in interest rates have made a difference since I ordered.
Yep - the prices went up My November 2020 P2, same as yours, plus the option wheels is only £505 per month.
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