Pre-conditioning at home...energy pulls from battery instead of the wall? why?

[ginmqi]

Correct me if I'm wrong but it seems like when I precondition my car while its at home and connected to my 240v outlet (its the mobile connector, not hardwired/tesla wall charger) that it seems to draw the energy for the preconditioning from the HV battery instead of straight from the wall? I noticed since I will set the charge to say 80% and then when I leave at a later time after it has already been charged to 80% then I see it dips below 80% and the HVAC has been kicking on.

I though it would pull the preconditioning energy from the wall/mobile connector instead of the HV battery? Not a huge deal but just slightly annoying to start the drive with less than my preset charge...maybe I'll have to charge it a few extra percent to account for this?

 

[ucmndd]

It DOES use shore power when connected to a charger, you should be able to verify this via the app and/or indicator lights on the charging equipment.

That said, preconditioning can and often does use more power than the mobile connector can provide. In that case the balance comes from the HV battery.

 

[ginmqi]

It DOES use shore power when connected to a charger, you should be able to verify this via the app and/or indicator lights on the charging equipment.

That said, preconditioning can and often does use more power than the mobile connector can provide. In that case the balance comes from the HV battery.

Ah got it. Thanks!

 

[brainhouston]

I don't pre-condition but if I leave few hours after charge was complete, sometimes it's few % lower...
Car won't recharge unless it drops 5% in my case, 2016 X

 

[philander]

Apropos of... certainly not this 80% case, but in my experience if you're below 20% SOC, preconditioning won't start even if you're connected to adequate wall power.

 

[aerodyne]

I see almost no current going to precondition the battery at temps above 50 degrees. Can't comment on lower temps because they don't happen here...

So, I just charge to get the batt warmed up. Makes a slight difference going from a warmish garage to 40ish deg temps as far as efficiency on the road

 

[KalJoMoS]

On that 240V you will get 3kW (if on UMC, one phase circuit). Your car preheating is above 5kW so all that is missing from the outlet will be provided by the battery.

 

[shahryaran]

But isn't the energy stored in the battery overnight is from the wall?
So it kind of does.
You stored that energy in the battery and now use the battery to precondition.