Charging cost and time
Discussion
Just got my Tesla M3 LR and done a few trips to work and back.
So now I'm trying to work out the cost and how long I need to charge for.
I only have a 3 pin socket at home at the moment. From what chatgpt is telling me, I'm not entirely sure it's correct. Also I'm trying to work out the savings by changing tarrif.
So my journeys total energy used is 15.5kWh. Currently the tarrif I'm on is 0.27p all day.
The tarrif I'm looking at is 5 hours at 0.089p and then the rest of the it's 0.2937p.
If someone who's smarter then me obviously could work this out, I'd appreciate it.
Chatgpt is saying current tarrif would cost £4.03 but if I change tarrif it would be £2.19.
Would also be good to know how long it would take for a standard 7kW home charger.
So now I'm trying to work out the cost and how long I need to charge for.
I only have a 3 pin socket at home at the moment. From what chatgpt is telling me, I'm not entirely sure it's correct. Also I'm trying to work out the savings by changing tarrif.
So my journeys total energy used is 15.5kWh. Currently the tarrif I'm on is 0.27p all day.
The tarrif I'm looking at is 5 hours at 0.089p and then the rest of the it's 0.2937p.
If someone who's smarter then me obviously could work this out, I'd appreciate it.
Chatgpt is saying current tarrif would cost £4.03 but if I change tarrif it would be £2.19.
Would also be good to know how long it would take for a standard 7kW home charger.
For timing, 15.5 kWh on a three-pin charger at ~2.2 kW will take approx 7hours (15.5 / 2.2 = 7.05).
With a hardwired home charger at 7kW, it would be 15.5 / 7 = 2hrs 13 mins
For costs:
- On your current all-day tariff, 15.5 kWh x 27 p/unit = £4.18 (whatever sort of charger you use)
- On the split rate tariff with the three-pin charger you pay
5 hours x 2.2 kW x 8.9p = 98p
+2 hours x 2.2 kW x 29.37p = £1.32
for a total of £2.30
- With a 7kW home charger, all charging is at the lower rate, so
15.5 kWh x 8.9p = £1.38
If you go to the split rate, obviously you're paying a higher rate during the day. 2.37p a unit surcharge at the UK average electricity consumption of 2700 kWh is £63.99 a year, or 17.5p/day.
However you'd only have to shift about 15% of your domestic consumption into the overnight period (a dishwasher or laundry run, say) to break even on domestic usage, thus leaving the charging savings undiminished.
If I were you, I'd just sign up for Intelligent Octopus Go. I believe it natively supports Teslas, so you could do that with either the three-pin or a 7kW charger. With IOG you charge the car at 7p a unit for as long as it needs charging, without paying a surcharge in daytime. So swap electricity supplier, zero upfront cost, cheaper overnight for as long as you need, and no extra daytime cost.
With a hardwired home charger at 7kW, it would be 15.5 / 7 = 2hrs 13 mins
For costs:
- On your current all-day tariff, 15.5 kWh x 27 p/unit = £4.18 (whatever sort of charger you use)
- On the split rate tariff with the three-pin charger you pay
5 hours x 2.2 kW x 8.9p = 98p
+2 hours x 2.2 kW x 29.37p = £1.32
for a total of £2.30
- With a 7kW home charger, all charging is at the lower rate, so
15.5 kWh x 8.9p = £1.38
If you go to the split rate, obviously you're paying a higher rate during the day. 2.37p a unit surcharge at the UK average electricity consumption of 2700 kWh is £63.99 a year, or 17.5p/day.
However you'd only have to shift about 15% of your domestic consumption into the overnight period (a dishwasher or laundry run, say) to break even on domestic usage, thus leaving the charging savings undiminished.
If I were you, I'd just sign up for Intelligent Octopus Go. I believe it natively supports Teslas, so you could do that with either the three-pin or a 7kW charger. With IOG you charge the car at 7p a unit for as long as it needs charging, without paying a surcharge in daytime. So swap electricity supplier, zero upfront cost, cheaper overnight for as long as you need, and no extra daytime cost.
Edited by samoht on Thursday 18th September 23:10
Ankh87 said:
Just got my Tesla M3 LR and done a few trips to work and back.
So now I'm trying to work out the cost and how long I need to charge for.
I only have a 3 pin socket at home at the moment. From what chatgpt is telling me, I'm not entirely sure it's correct. Also I'm trying to work out the savings by changing tarrif.
So my journeys total energy used is 15.5kWh. Currently the tarrif I'm on is 0.27p all day.
The tarrif I'm looking at is 5 hours at 0.089p and then the rest of the it's 0.2937p.
If someone who's smarter then me obviously could work this out, I'd appreciate it.
Chatgpt is saying current tarrif would cost £4.03 but if I change tarrif it would be £2.19.
Would also be good to know how long it would take for a standard 7kW home charger.
15.5kWh @ £0.27/kWh = £4.19So now I'm trying to work out the cost and how long I need to charge for.
I only have a 3 pin socket at home at the moment. From what chatgpt is telling me, I'm not entirely sure it's correct. Also I'm trying to work out the savings by changing tarrif.
So my journeys total energy used is 15.5kWh. Currently the tarrif I'm on is 0.27p all day.
The tarrif I'm looking at is 5 hours at 0.089p and then the rest of the it's 0.2937p.
If someone who's smarter then me obviously could work this out, I'd appreciate it.
Chatgpt is saying current tarrif would cost £4.03 but if I change tarrif it would be £2.19.
Would also be good to know how long it would take for a standard 7kW home charger.
15.5 kWh @ £0.089/kWh = £1.38
HTH
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