I tried to calculate battery's capacity, using the rule of three. I'll give an example. In a route of 85km the avg. consumption was 17.5kwh/100km. That means that (85x17.5)/100=14.875kwh were consumed for the route. At the start the battery was at 80%, and at the end of the route was 51%. That means that 80-51=29% of the battery's capacity is equal to 14.875kwh. Using the rule of the three method, the total battery capacity is  (14.875x100)/29=51kwh. But my vehicle is enyaq 60 and that makes no sense. I should have get 58kwh. I've done this for several routes but I keep getting calculations about 50kwh. Any thoughts?

Best maybe start with 100% and run until there is a displayed 10% battery left and then charge again to 100% and see how many kWh it takes.

Similar to brimming an ICE vehicles but unlike an ICE you can not vent the tank.  The Battery will only take what it can take. 

(indicated range & kWh per Km or mile matters not as affected by weather / temp etc,  what you want to know is how much usable electric there is.)

 

 

 

 

 

 

 

Edited 17 November, 20214 yr by roottoot

Advertised capacity and real world capacity are unlikely to be exactly the same, even in optimal ambient temperatures.

Where in the world are you and what ambient temperatures are you experiencing at the moment?

I'm in Greece ant the temperature  was about 15oC, which is not bad to do some battery testing. No heat pump. I wasnt expecting to get 58, but for a brand new vehicle I expected a 55%. 

A fully charged battery gives me a real range of 280 km (170miles) with average consumption of 17.5kwh/100km (28kwh/100mi or 3.6mi/kwh) 

I'm in Greece ant the temperature  was about 15oC, which is not bad to do some battery testing. No heat pump. I wasnt expecting to get 58, but for a brand new vehicle I expected a 55%. 

A fully charged battery gives me a real range of 280 km (170miles) with average consumption of 17.5kwh/100km (28kwh/100mi or 3.6mi/kwh) 

I posted from my phone and my previous post was a bit wrong - so I Re-post

 

I'm in Greece ant the temperature  when i did that test was about 15oC, which is not bad to do some battery testing. No heat pump. I wasnt expecting to get from my calculations a 58Kwh, but for a brand new vehicle I expected to calculate 55Kwh. A fully charged battery gives me a real range of 280 km (170miles) with average consumption of 17.5kwh/100km (28kwh/100mi or 3.6mi/kwh).

 

I charged the battery and did some reverse calculations from the Kwh consumed by the wallbox, still the same result.   

You are not getting battery capacity by going with averages of km or miles per kWh.  Averages are made of highs and lows of numbers.

 

I have a car with a 50 kWh battery and 45 kWh usable.  I know that it takes 45 kWH but sometimes more.

3 miles per kWh x 45 = 135 miles.

4 miles per kWh x 45 = 180 miles

 

Coldest weather last winter and a few times i was getting only about 2 miles a kWh so

 was only getting 90 miles from full to nearly empty just driving short trips locally. 

I do not run it to empty but have to 5% showing .

 

I went 110 miles on a few occasions on runs in the same temperatures, the difference was weight carried in car as in a passenger or not, and also the car / battery hot before starting off and a non stop journey.

I might  get a indicated 2.1 kWh for some parts of a journey & when descending / regening over 3.5. 

The car just gives figures and sometimes they are pretty accurate and sometimes they are just strange but you get to know after setting out from a full charge how things might go for range, and is there lots of energy used at the start of the trip or are you getting regen and the battery charge is staying higher for the start of a trip.

 

At present in coldish weather i use near 5 kWh of charge only driving on average just 6 miles a day average and the car sitting the rest of day and night doing nothing. 

 

 

 

Edited 18 November, 20214 yr by roottoot