EV and Air Source Heat Pump!

cathyem1

I wonder if anyone is in the same position as me. I’ve got an EV and home charger that are not eligible for Intelligent Octopus Go and am having an ASHP installed this week. Is there a best energy rate for these two? I have been looking at the difference between Octopus Go and Cosy Octopus and seeking other suppliers, but my head is spinning! Any recommendations would be very gratefully received.

QrizB

It really depends on your numbers.

• Imagine you've got a fairly verage house and use 2500kWh a year for normal stuff.
• And the same average house needs 10500kWh a year for heat. At a COP of 3 that's 3500kWh.
• Then imagine you drive your EV for 9000 miles a year, get 3 miles per kWh and charge solely at home, that's 3000kWh.

So that's 9000kWh a year.

• On the standard variable tariff, it'll cost you ~25p/kWh. That's £2250 a year.
• If you switch to Cosy, and can arrange to use the heat punp and charge the car exclusively on the 13p/kWh Cosy rate, that's £845. Your domestic use will spead across the rates, but might average 30p/kWh? That's another £750. Total cost £1595.
• Or on Go, you'll get your car charging and maybe a 1000kWh of your other use at 8.5p/kWh. That's £340. The remaining 5000kWh will be at 26.5p/kWh, which makes £1325. Total £1665.

Work out your own expected use, check the tariffs for your own region and do the maths for your particular situation. Then choose!

Edit to add: if you swapped your EV charger for one that's compatible with Intelligent Go, on those numbers it would save about £100 a year (combining the lower tariff and longer off-peak period). Only marginally worth it considering the install cost.

cathyem1

QrizB said:

It really depends on your numbers.

• Imagine you've got a fairly verage house and use 2500kWh a year for normal stuff.
• And the same average house needs 10500kWh a year for heat. At a COP of 3 that's 3500kWh.
• Then imagine you drive your EV for 9000 miles a year, get 3 miles per kWh and charge solely at home, that's 3000kWh.

So that's 9000kWh a year.

• On the standard variable tariff, it'll cost you ~25p/kWh. That's £2250 a year.
• If you switch to Cosy, and can arrange to use the heat punp and charge the car exclusively on the 13p/kWh Cosy rate, that's £845. Your domestic use will spead across the rates, but might average 30p/kWh? That's another £750. Total cost £1595.
• Or on Go, you'll get your car charging and maybe a 1000kWh of your other use at 8.5p/kWh. That's £340. The remaining 5000kWh will be at 26.5p/kWh, which makes £1325. Total £1665.

Work out your own expected use, check the tariffs for your own region and do the maths for your particular situation. Then choose!

Edit to add: if you swapped your EV charger for one that's compatible with Intelligent Go, on those numbers it would save about £100 a year (combining the lower tariff and longer off-peak period). Only marginally worth it considering the install cost.

You are an absolute star ⭐ thank you so much! I’ll give the calculations a go. You’re on the Christmas 🎄 card list 😉

Reed_Richards

I'm on the Eon NextDrive V5 tariff.  For my area, that's 6.381p + VAT per kWh between 00:00 and 07:00 and 22.985p + VAT per kWh for the rest of the day.  Standing charge is 61.117p + VAT per day.  Maybe @QrizB can do their sums and see how that compares to the Octopus tariffs?  

QrizB

Reed_Richards said:

I'm on the Eon NextDrive V5 tariff.  For my area, that's 6.381p + VAT per kWh between 00:00 and 07:00 and 22.985p + VAT per kWh for the rest of the day.  Standing charge is 61.117p + VAT per day.  Maybe QrizB can do their sums and see how that compares to the Octopus tariffs?  

Lol ok, challenge accepted

Let's say all the car charging plus 1500kWh of the rest at 6.7p/kWh, plus 4500kWh at 24p/kWh. £300 plus £1080, total £1380.

YMMV, offer not valid in Basingstoke (just because).

cathyem1

Reed_Richards said:

I'm on the Eon NextDrive V5 tariff.  For my area, that's 6.381p + VAT per kWh between 00:00 and 07:00 and 22.985p + VAT per kWh for the rest of the day.  Standing charge is 61.117p + VAT per day.  Maybe @QrizB can do their sums and see how that compares to the Octopus tariffs?  

Thank you! 

cathyem1

QrizB said:

Reed_Richards said:

I'm on the Eon NextDrive V5 tariff.  For my area, that's 6.381p + VAT per kWh between 00:00 and 07:00 and 22.985p + VAT per kWh for the rest of the day.  Standing charge is 61.117p + VAT per day.  Maybe QrizB can do their sums and see how that compares to the Octopus tariffs?  

Lol ok, challenge accepted

Let's say all the car charging plus 1500kWh of the rest at 6.7p/kWh, plus 4500kWh at 24p/kWh. £300 plus £1080, total £1380.

YMMV, offer not valid in Basingstoke (just because).

QrizB said:

Reed_Richards said:

I'm on the Eon NextDrive V5 tariff.  For my area, that's 6.381p + VAT per kWh between 00:00 and 07:00 and 22.985p + VAT per kWh for the rest of the day.  Standing charge is 61.117p + VAT per day.  Maybe QrizB can do their sums and see how that compares to the Octopus tariffs?  

Lol ok, challenge accepted

Let's say all the car charging plus 1500kWh of the rest at 6.7p/kWh, plus 4500kWh at 24p/kWh. £300 plus £1080, total £1380.

YMMV, offer not valid in Basingstoke (just because).

This is just getting better! I'll check out Eon 🤩

cathyem1

Ok, I've just checked and my tariff would be 

Peak 25.39p per kWh
Off peak 6.7p per kWh
Standing charge 50.84p

4500 kWh at 6.7p = £301.50
4500 kWh at 25.39p = £1142.55
Total £1444.05 
VAT 5% 72.20
Standing charge £185.56

GT £1701.81

Does this look right?

cathyem1

Obviously this is based on the original usage quoted. I think ours would be a bit lower as we have a 2 bed house, but we are at home all day

QrizB

Can you check that you haven't added VAT twice? And you should be able to check your energy bills and see what your estimated annual consumption is, before you get your ASHP, then base your future electricity use on that.

cathyem1

I have my annual gas and electric usage. Do I just apply COP 3 to my gas kWhs used or use the number as written?
I'll check on the VAT - thank you