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Measure how much energy used for non-driving (eg AC)?

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Mrklaw

Active Member
Mar 5, 2020
2,623
1,734
Berkshire
Is there any way to measure the electric used for other systems like AC etc during driving and while parked up? Recently while parked for relatively short periods I’ve forced the AC to stay on while shopping to come back to a cool car, so was curious what it was costing.

I have teslafi if that can do it?
 
TeslaFi will give a useful ball park figure in the context of the BMS reported figures but that can report different figures just by virtue of sitting there so whilst not definitive, still useful enough to categorise into the context of not much, quite a bit, significant etc

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And here's how Tessie reports it. The cost is based on what you put in as your home electric rate (I only public charge so put that as 35p/kWh).

It'll also do you a graph for a set time like the last 7 days.
 

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in my experience the difference between the KW supplied by the charger (AC) and the energy reported used by the car for driving is about 30% . I based this on a 6 month period when all my charging was being done at one charger so I could easily compare the two.
obvously it depends on time of year preheat, sentry use (minimal in my case) etc
 
My 2020 SR+ is better charging from 32A, according to TeslaFi; driven = 2,845kwh (20% of used), added = 3, 290kwh (7.3% of used) and used = 3,551kwh.
Lifetime; miles driven = 10,243 with 278 Wh/Mile, Avg Speed = 33.2 mph and Total Cost £180
I don't precondition often except when freezing or like now <28C