Monthly Cost Calculation
Discussion
I'm about to get my first EV and trying to calculate my monthly fuel cost but it seems to low!
Is it as simple as follows:
I do roughly 1,000 miles per month and the car will get roughly 200 miles per charge from a 60kwh battery, thus it would need charging 5 times from empty to full (I appreciate it'll always be topping up), and therefore I would use 300kwh of charge at my night time rate of 9.3p/kwh
My simple calculation equates to only £27.90 (+VAT) per month which seems rather low.
Am I doing it right?
Is it as simple as follows:
I do roughly 1,000 miles per month and the car will get roughly 200 miles per charge from a 60kwh battery, thus it would need charging 5 times from empty to full (I appreciate it'll always be topping up), and therefore I would use 300kwh of charge at my night time rate of 9.3p/kwh
My simple calculation equates to only £27.90 (+VAT) per month which seems rather low.
Am I doing it right?
Your range (as in, miles per kWh) figures may be a little optimistic, especially in winter. What kind of journeys are you doing? Bear in mind economy in an EV is the opposite of an ICE - so they can be better around town than on long trips.
If you didn't realise already, if you're charging at home the VAT is only 5%.
If you didn't realise already, if you're charging at home the VAT is only 5%.
Range for the car is 280 miles, and all the reviews online say c.200 is achievable even through the winter.
My journeys are mostly local (a/B roads) of 10 miles each way) plus a 120 mile round trip to work once each week on the M25/M4 where 70mph would be aspirational and it's more like 50-60mph.
I had forgotten about only 5% VAT, and the cost just seems exceptionally low, but that's good, especially as I should also be able to charge at work for free too, if I get up early enough!
My journeys are mostly local (a/B roads) of 10 miles each way) plus a 120 mile round trip to work once each week on the M25/M4 where 70mph would be aspirational and it's more like 50-60mph.
I had forgotten about only 5% VAT, and the cost just seems exceptionally low, but that's good, especially as I should also be able to charge at work for free too, if I get up early enough!
We cover around 800 miles a month (80% local, 20% motorway) and over the last 4 months the average cost per month is £35.
We use intelligent octopus for overnight charging.
This is for a model 3 performance that always has the heating on 28 degrees when O/H drives and when I drive, I dont think about economy i.e. drive quickly and usually at night. O/H covers around 85% of the driving
We use intelligent octopus for overnight charging.
This is for a model 3 performance that always has the heating on 28 degrees when O/H drives and when I drive, I dont think about economy i.e. drive quickly and usually at night. O/H covers around 85% of the driving
TheRainMaker said:
Yep, just add on 15-30% for charging losses and you are there.
What EV loses 30% during charging on a 3 pin or 7kWh charger?10% is about right from what I've experienced across 3 different EV's and 50k miles of home charging, so based on the OP's numbers I'd suggest 3 miles/kWh, or 3.1ppm at 9.3p kW. So £31 for 1000 miles including losses would seem about right.
Edited by SWoll on Thursday 20th April 12:10
For the purposes of your calculation, the car's range is irrelevant. All you need to know is how many miles you can do per kWh (over the last 11 months mine has averaged 3.28 mls/kWh), which will tell you how many kWh you need per month. Then multiply that by however much you pay per kWh. So : 1000/3.28 = 305kWh which at 9.3p/kWh will cost £28.35. As you are buying all that (rather than getting any from PV for example), then you need to add on say 10% for efficiency losses and 5% for VAT. I'd budget £35/month.
I also find that even though I should get 6hrs off peak electricity that I usually get 7 or 8 hrs if that is how long the car will take to reach the specified charge limit.
Regarding the increase to the daytime rate, I just switched my dishwasher, washer and dryer to kick off at 11.30pm and this alone has reduced my overall daily spend.
Equally, moving the gas to octopus tracker has reduced my gas spend significantly. I was on 10p/kWh and now its usually around 6p, today is 4.88p!
Regarding the increase to the daytime rate, I just switched my dishwasher, washer and dryer to kick off at 11.30pm and this alone has reduced my overall daily spend.
Equally, moving the gas to octopus tracker has reduced my gas spend significantly. I was on 10p/kWh and now its usually around 6p, today is 4.88p!
SWoll said:
TheRainMaker said:
Yep, just add on 15-30% for charging losses and you are there.
What EV loses 30% during charging on a 3 pin or 7kWh charger?10% is about right from what I've experienced across 3 different EV's and 50k miles of home charging, so based on the OP's numbers I'd suggest 3 miles/kWh, or 3.1ppm at 9.3p kW. So £31 for 1000 miles including losses would seem about right.
Edited by SWoll on Thursday 20th April 12:10
https://www.energate-messenger.com/news/225482/ada...
TheRainMaker said:
According to a completely unbiased test funded by the German automobile association..
Remember reading it at the time, and the big losses were all seen on a single model (Zoe) in winter. Here are the results for the rest of the cars tested.
Using a dedicated wallbox charger would appear to make my 10% estimation a little high, and even on a 3 pin every other model is at 15% or lower.
If you choose OVO energy and use their charge anytime tariff, you won't pay any more than 34p/kwh for non-EV use. And the EV charging cost is 10p/kwh.
Costs us £6.90 to charge from zero to 100%. And that is good for 200 - 240 miles depending on weather/conditions/driving style.
So between 3.45p and 2.86p per mile.
Costs us £6.90 to charge from zero to 100%. And that is good for 200 - 240 miles depending on weather/conditions/driving style.
So between 3.45p and 2.86p per mile.
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