I apologize in advance if this has been discussed to death already, but I have searched the forum threads, used volkerize and read the owners manual and can’t figure out precisely what “preconditioning” is and how it works.
I am preparing to take my first long trip in my P85D away from supercharges and want to maximize my driving range, so I want to do everything “right”.
There are two different things people seem to conflate (or perhaps they are the same?) when discussing preconditioning: 1) Getting the cabin to a comfortable temperature before leaving and 2) Getting the battery to operating temperature before leaving
I’m not concerned about #1 – my car is in a garage at 55 degrees and I can use the phone app to set the temp a bit before I leave and will be fine.
#2 is where I would like a lot more specific information. Threads indicate warming can occur from driving the car, charging the battery or by the onboard warmers. It appears to be far more power intensive (one thread indicated the draw could outstrip a 40A connection) and potentially a big contributor to initial power use.
Suggestions in threads range from:
• Timing charging so the car hits 100% just seconds before you get in and drive off
• Warming the cabin up to 70 degrees an hour early and this warms the battery as well
• Get in the car an do something to wake the car up
• Just leaving the car plugged in overnight (this one doesn’t seem correct to me)
1) What is the “preconditioned” operating temperature of the battery?
2) Assuming the garage and battery are at 55 degrees, how much energy is expended to warm the battery?
3) Does charging the battery always get the battery to operating temperature? Or only if it’s for long enough and the outside temp isn’t too low? For example, is saving the last 10% of the charge for just before you leave sufficient or might that not fully warm the battery?
4) Does preconditioning get the battery to a minimum temperature or a range of temps?
5) Does charging hit that minimum temp or actually get the battery much warmer than that?
6) Could a big charge actually get the battery warm enough that the battery would need to cool initially using battery power to do that?
7) If the battery is “fully preconditioned”, how much temp does it lose per hour (Assuming it’s in a 55 degree garage)?
8) Does the fact that the car doesn’t seem to take power from the wall until it loses 3% mean you could lose this to preconditioning without taking it from the wall?
9) Once the battery is preconditioned is there any way to enter a "hold" mode when plugged in to keep the battery warm?
I know that I am likely totally overthinking this, but from reading the forums I know there are plenty of smart and dedicated (and curious!) MS owners and I’m betting someone might definitive answers!