ricky10 wrote: ↑Fri Oct 06, 2023 10:59 pm
I don’t like the idea people just use off peak rate to work out running cost.
What about your peak tariff compared with say capped rate. Your house still needs leccy to run. By having an EV tariff you are going to run up the house leccy bill.
And the comparison is possibly even worse when compared with a tracker tariff where leccy rate has been around 15p consistently over the last few months.
I agree that calculating running cost solely on the basis of off peak rate is too simplistic and will generally give an optimistic answer. For the domestic useage the increase in peak electricity costs can increase the overall domestic cost, depending on the use profile. In my area Variable Octopus currently costs 27.511p/kWh where IO costs 30.6p/kWh peak rate and 7.5p/kWh off peak. If all the domestic use is during peak hours then the use costs, excluding standing charge, would increase by over 11% which has to be offset against the savings from off peak charging. If however the average demand is the same over the peak and off peak periods then the average rate is 24.825p/kWh which gives a 10% saving on the cost of domestic electricity and could be offset against the running costs of the car.
Cooking, ironing, use off kettle, coffee machine, radio, television etc are going to be concentrated in peak rate, however fridge, freezer, networking etc are likely to be on 24/7 and dishwasher, washing machine can often be operated off peak so there are significant savings opportunities. Using 1 minute interval where available, or otherwise using 15 minute interval, demand data for typical days where there is no car charging and the dishwasher was not used is showing typically 30p saving per day for domestic usage. Once solar power is taken into account, because this is used during peak hours, the saving due to switching to IO increases to 40p per day. This will vary day to day but I expect the effect on domestic use to at worst be cost neutral and probably to be beneficial. With charging 2 cars I expect a considerable saving. As the PodPoint charger is not aware of times where IO chooses to extend charging into peak hours the costs that it reports will be slight over estimates, however, for simplicity, I will use these values to assess the car running costs and assume that there is no increase or decrease in domestic costs due to the change to IO which should be taken into account.
iV80 Loft, 19"Regulus, Energy Blue, Maxx Pack, Travel Pack, Heat pump. Order Jul22. BuildWk17-23. UK WE23/6. Available 30/6/23. Collected 3/7/23 Untethered PodPoint. Third Rock mode 2 charger with Tough Leads modular extension lead and adapters.
