Economy 7 - Electric Car & Immersion Heater.. A few questions

Cardew

DragonQ said:

Note that my estimate of 235 miles for a 64 kWh battery is pretty pessimistic, that's more if you're doing a lot of driving at 70 mph. You'd get closer to 300 miles with mostly city driving.

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https://www.whatcar.com/news/what-car-real-range-which-electric-car-can-go-farthest-in-the-real-world/n18159

The tests in this article give 'real world motoring' range and  all have considerably less range than you suggest. There is a link in the article which shows the test criteria.

DragonQ

Cardew said:

DragonQ said:

Note that my estimate of 235 miles for a 64 kWh battery is pretty pessimistic, that's more if you're doing a lot of driving at 70 mph. You'd get closer to 300 miles with mostly city driving.

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https://www.whatcar.com/news/what-car-real-range-which-electric-car-can-go-farthest-in-the-real-world/n18159

The tests in this article give 'real world motoring' range and  all have considerably less range than you suggest. There is a link in the article which shows the test criteria.

I can't see where they actually break down what their test entails beyond "a mix of stop-start urban traffic, rural roads and motorways". WLTP figures are generally considered good, although it hugely depends on what kind of driving you're doing and temperature (just like a petrol or diesel car). For what it's worth, the numbers in that article are a fair bit lower than the average of numbers I've seen elsewhere (for the cars I've looked into anyway), so it depends who you believe I suppose. Obviously when calculating you need to use the efficiency of the car you have or are interested in and for me it was the Kona or e-Niro, which are at the top end of the efficiency range.

Cardew

DragonQ said:

I can't see where they actually break down what their test entails beyond "a mix of stop-start urban traffic, rural roads and motorways".

There is a link in the article I posted. https://www.whatcar.com/news/what-car-real-range-how-we-work-it-out/n18158

I have never owned an electric car, but most of the articles I have read say the manufacturers claimed range is akin to manufacturer's claimed MPG for petrol/diesel cars.

DragonQ

Yes I went to that link, which describes a lot about how they make the test fair between different models but almost nothing about the driving conditions of the test (page 10), hence I said:
I can't see where they actually break down what their test entails beyond "a mix of stop-start urban traffic, rural roads and motorways". 

I'm not referring to manufacturer figures, which I agree are higher than most people would obtain, I'm referring to real-world reports from different reviewers and users. For example, Kia claim the e-Niro will do 282 miles. The EV database claims 235 miles is more realistic. From my research, it's probably about half way between that. The WhatCar article claims it to be 224 miles, very much on the low side.

Again, it depends hugely on conditions. If you're doing a constant 70 mph maybe you'd only get 200 miles out of it. If you did pure city driving you'd likely exceed 300 miles.