Preconditioning on 120v...

[VandalSibs]

Question on preconditioning on 120v power...

My SR+ gets back all of the power I use in my 50-ish mile round trip commute overnight on a 120v/15amp plug in my apartment's garage. I charge to 80%.

What I'm wondering is, does the car restrict the amount of 'climate control' to what shore power can provide, or does it balance between shore power and battery power?

 

[M3BlueGeorgia]

In my experience using 120v/15A while visiting relatives, it uses whatever power it needs, so heating the car would use a mixture of battery and power connection. At higher wattage, it can avoid using batteries.

 

[ilyak]

What I'm wondering is, does the car restrict the amount of 'climate control' to what shore power can provide, or does it balance between shore power and battery power?

I've not observed any difference in preconditioning itself between being plugged into an l1 outlet and an l2 one. The car will draw what it needs without restraint in both cases. I've seen preconditioning draw as much as 9 kW in my car, and it happily dipped into the battery for the 8 out of those 9 that an l1 connection wasn't able to supply.

 

[hcdavis3]

Conditioning by definition comes from the battery. There is no such thing as shore power. At 120 volts there’s no way the battery can keep up, especially when it’s cold.

 

[webbah]

It definitely uses what it needs. I can see this with ScanMyTesla while charging and using the heater on HI for testing (essentially the same as preconditioning).

 

[Rocky_H]

Argh.

Conditioning by definition comes from the battery.

Nonsense. Conditioning just means running heaters. This energy can (and does) come from various sources.

There is no such thing as shore power.

WTF? Of course there is. That is the outlet the car is plugged into and draws energy from.

At 120 volts there’s no way the battery can keep up, especially when it’s cold.

All of this is just basic subtraction of power levels. For a regular 5-15 outlet, it can only supply 1.4 kW of ongoing power draw. If the car is running some kind of heating for cabin or battery preconditioning, and that is consuming 4 or 6 or more kW, then sure, it is going to draw all of that 1.4kW from the "shore power" connection and also take whatever else it needs in addition from the battery too.

 

[jboy210]

Argh.

Nonsense. Conditioning just means running heaters. This energy can (and does) come from various sources.

WTF? Of course there is. That is the outlet the car is plugged into and draws energy from.


All of this is just basic subtraction of power levels. For a regular 5-15 outlet, it can only supply 1.4 kW of ongoing power draw. If the car is running some kind of heating for cabin or battery preconditioning, and that is consuming 4 or 6 or more kW, then sure, it is going to draw all of that 1.4kW from the "shore power" connection and also take whatever else it needs in addition from the battery too.

Sounds like you guys are saying the same thing. Just arguing if A/C power goes the charger to the heater, or from charger to battery and then to heater.

 

[VandalSibs]

Seems like that on 120v/15amp it draws from both. Thanks for all the input guys!

 

[SilverSp33d3r]

Even on my SR+ it needs more than the 240/32 AMP provided from my wall connector. With full pre-heat it looses~1% every 20 min.