EV Discussion thread

1961Nick

There's hardly been any premium on the IO day rate & with the latest price reduction it's the same as the price cap. The standing charge is a little bit higher but that's a small price to pay when you're charging your car at 7.5p/kWh.

My import has averaged just under just under 8p/kWh & I'm also on target to consume 98% of this year's generation - last year was 96%.

michaels

WE have V2H and a TOU tariff (5 hours 4.5p, 19 hours 45p), average unit rate (excluding free PV) is about 6.5p per kwh.

We also heat water tank and house using leccy during the off peak window as 4.5p per unit is much cheaper than gas.

Grumpy_chap

Grumpy_chap said:

209 miles in total for the return journey and the car reads 44 kWh consumed. 
That equates to 4.75 miles/kWh which I'd be very pleased with.
I have plugged the car in to charge again.  The car reports this will take 22 hours (via granny charger as my charge point is not yet in place).  That's 2 kW load to replenish 44 kWh in 22 hours.  I will update after the charge if the car then reports anything different and any change to the miles/kWh.

Compared to the 44 kWh the car said I used in driving, the amount the car says I replenished back to the start point is 50 kWh.

My electric rate is 30.90 pence/kWh so a cost for the journey of £15.45 in energy.
Based on comments, I should add between 10% to 20% for charging losses via the granny charger.  That works out to 60 kWh or £18.54 at the higher end.
My wife calculated petrol cost for her Fiesta would have been £21.50
A win for the EV.

Solar or EV tariff would have been cheaper still.  Paid public charging would likely have been more expensive than home charging though I don't have accurate information to assess that against petrol costs.  

The worst case miles / kWh based on the above is 209 miles / 60 kWh equals 3.5 miles / kWh. 
Maybe (hopefully) the charging losses are less than 20%?

Exiled_Tyke said:

I reckon our dishwasher uses about 2kWh a cycle. 

That is surprisingly high.
So much so, I went to look up the data for our dishawasher and it says 0.75 kWh/cycle:
https://www.johnlewis.com/bosch-series-6-smv6zcx01g-fully-integrated-dishwasher/p5558591?s_ppc=2dx92700070984466752_mixed_technology_BAU&tmad=c&tmcampid=2&gclid=EAIaIQobChMI19bXqOqDgAMVkfntCh0jpAdZEAQYASABEgKKC_D_BwE&gclsrc=aw.ds
(It's the second result if searching for "KWh" in the page)

Dishwasher is one of the easy time-shift wins that can be had because there is a delay function and the only concern is finished before you awaken in the morning.

Martyn1981

Hiya Grumpy, why not have a play with the numbers and see what you get.

Just for fun (and a start) I'll make a guestimate (actually two), so firstly let's say you use 3,000kWh's pa, and now add 8,000miles at an import rate of 4m/kWh, so +2,000kWhs.

For a second example, let's go with 4,000kWh's, plus 10,000 miles at 3.5m/kWh, so + 2,860kWh's.

For both, I'll guess at a baseload of 200W, or 511kWh pa, and we'll switch 75kWh's for that easy win dishwasher example.

So, for version 1, you start of with 5,000kWh's @ 30.90p/kWh = £1,545.

or with the OVO example of 33p day rate, 20p night rate and 10p BEV rate we get:

BEV rate, 2,000 @10p = £200
Night rate 586 @ 20p = £117.2
Day rate 2,414 @ 32p = £772.48
Total = £1,090
Save £455

For arguments sake, let's shift 25% of the BEV charging out of the EV charging rate, in case you need to force it, and put half in the night rate, and half in the day rate:

BEV rate, 1,500 @10p = £150
Night rate 586 + 250 @ 20p = £167.20
Day rate 2,414 + 250 @ 32p = £852.48
Total = £1,170
Save £375



Version 2, you start with 6,860kWh's @ 30.90p/kWh = £2,119.74

BEV rate, 2,860 @10p = £286
Night rate 586 @ 20p = £117.2
Day rate 3,414 @ 32p = £1,092.48
Total = £1,496
Save £624

And again, for arguments sake, let's shift 25% of the BEV charging out of the EV charging rate, in case you need to force it, and put half in the night rate, and half in the day rate:

BEV rate, 2,145 @10p = £214.50
Night rate 586 + 358 @ 20p = £188.80
Day rate 3,414 + 358 @ 32p = £1,207.04
Total = £1,610
Save £510


Have a play and see what you get, but with BEV's using some much energy, and being so easy to timeshift, I suspect the cheap/night rate options will win out, unless you have enormous daytime consumption, and minimal driving.

[Edit - Wow, there's a MSE member called '10p', who'd have thunk.]

Grumpy_chap

Martyn1981 said:

Hiya Grumpy, why not have a play with the numbers and see what you get.



[Edit - Wow, there's a MSE member called '10p', who'd have thunk.]

Thanks for the very detailed assessment - and taking the time to look at that.

I have to consider this in the round, especially the lack of smart meter.  I am struggling to get EDF to even agree to upgrade the meter to allow me to connect the EV charge point - that is a priority in the short term over whatever the tariff is.  I won't stay with EDF because they are awful, but assume that changing the meter will be quicker with current supplier than changing to a new supplier then initiating a meter swap.  I just want any meter that allows me to charge the car off a granny charger.




Let's hope that "10p" saved a bit more than that. 

silvercar

Grumpy_chap said:

Martyn1981 said:

Hiya Grumpy, why not have a play with the numbers and see what you get.



[Edit - Wow, there's a MSE member called '10p', who'd have thunk.]

Thanks for the very detailed assessment - and taking the time to look at that.

I have to consider this in the round, especially the lack of smart meter.  I am struggling to get EDF to even agree to upgrade the meter to allow me to connect the EV charge point - that is a priority in the short term over whatever the tariff is.  I won't stay with EDF because they are awful, but assume that changing the meter will be quicker with current supplier than changing to a new supplier then initiating a meter swap.  I just want any meter that allows me to charge the car off a granny charger.




Let's hope that "10p" saved a bit more than that. 

What is stopping you using the granny charger with your current meter?

Grumpy_chap

silvercar said:

What is stopping you using the granny charger with your current meter?

I meant "off" as in "not on" a granny charger.
I am currently using the granny charger because the electrician won't connect the  charge point via the existing meter and cutout.  Both need upgrading, each by separate companies.  Oh the joys of the split market.

Grandad2b

Grumpy_chap said:

I have to consider this in the round, especially the lack of smart meter.  I am struggling to get EDF to even agree to upgrade the meter to allow me to connect the EV charge point - that is a priority in the short term over whatever the tariff is.  I won't stay with EDF because they are awful, but assume that changing the meter will be quicker with current supplier than changing to a new supplier then initiating a meter swap.  I just want any meter that allows me to charge the car off a granny charger.

I can't comment on the prospects for getting a smart meter installed by your current provider but I switched to Octopus and asked for a smart meter at the same time. New meter was installed about a fortnight after the switch went through.

dave23

Hello Grumpy_chap do you have any idea how long the granny charger cable is? I am looking at getting an electric car and a Tesla is high on my list and would need to use a granny charger until I have a wall charger fitted

Grumpy_chap

dave23 said:

Hello Grumpy_chap do you have any idea how long the granny charger cable is? I am looking at getting an electric car and a Tesla is high on my list and would need to use a granny charger until I have a wall charger fitted

Amply long enough for me.
Realising that is not a standard unit of measurement I have just measured my lead and it is 5.5m.

Hope that helps.