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It used to be possible for the car to lose range while charging on 110V in extreme cold. A firmware update a couple of years ago prevents that from happening.
A cold soaked battery pack at -20C will, in my experience, not gain any charge on a 110V 15A circuit. Probably won't on a 20A circuit either, but I've not tried it. It will help a lot if temperatures warm up during the day. It will also help if you can keep the car out of the wind, which will otherwise drain heat from the battery pack very efficiently.
Good luck - I'm interested to hear what happens with your experiment...
Starting warm from driving seems to be the real trick.
Yes, the NEMA 6-20 outlet. Some motels use a NEMA 6-15 outlet.Most Air conditioners that plug into the wall... found in A LOT of hotels older than ~15 years; pretty much any hotel where you park outside your door... are 220 (usually 208v) and 20 amps. I've charged off these on a few occasions; you can usually get a good ~3kW charge rate off them... I wouldn't try to pull more than 18 amps or you risk tripping the breaker....
Most garages have 20A outlets. If yours does you may want to get the NEMA 5-20 adapter for the UMC and then you could get 5 miles of range per hour charging. The difference adds up, especially when parked in a hotel garage overnight.I've used 120v time to to time, adds +4 miles per hour. I actually do it in our work garage sometimes if I start the week on a low % of charge. I can drive to work and use about 8 miles to get there, 8 miles to get home = 16 miles (rated) each day. Plug in though for about 8 hours and it nets me a good ~30-32 miles. In just going back to work it covers my commute and other errands for the day, and nets me gain each day as well.
-T
I currently achieve a 5-6mph charge rate on a S with a 5-20 (a wonderful UMC adapter, IMO!). It wouldn't surprise me one bit if my new Model ☰ will charge at 7mph with a 5-20.Most garages have 20A outlets. If yours does you may want to get the NEMA 5-20 adapter for the UMC and then you could get 5 miles of range per hour charging. The difference adds up, especially when parked in a hotel garage overnight.