I realize this is an older thread, but I have a similar question - perhaps by now others from this post have learned more about the Battery TMS behavior and can help me out.
I have a 2016 Spark EV 2LT with QC. Have had it about a month & have questions regarding Battery TMS.
I live in Phoenix, and its June now, temps are 100 deg + a day, average around 105deg.
I agree with Zoomit, that there should be clear and specific details on how the car operates and what its programed to do when plugged in so I know what to expect, charging, unplugged, etc... Simply recommending to leave it plugged in if temps are +/- certain ranges is vague as to what you can expect to happen or what the parasitic power usage will be.
My situations is this:
I have an on/off Peak power plan. Off peak is overnight from 7pm & 12 noon next day - cheapest power & no demand charge. Between 12 noon - 7pm power is more expensive PLUS there is a demand charge for appliances that use significant amperages - ie: Dryer, AC, Stove, EVSE.
I have the Bosch 40a EVSE (obviously the Spark can only charge at a max rate of 3.3kw - (I have other EV's that charge at 6.6kw & higher). I charge the car in the morning & its charged 100% complete before 12 noon. But during the afternoon between 12-7 when it gets hot in the garage I will see the EVSE blinking (indicating charging in progress) and fans are on in the Spark. Obviously thats the TMS maintaining the battery temp. The Bosch or Clipper Creek EVSE's I have don't indicate the specific power consumption, they just indicate charging or not.
My question is:
What is the power draw for the battery TMS system when the car is fully charged and the TMS turns on to maintain/condition the battery to the proper temp range?
If it draws a significant amount of 240 power, it could increase my On Peak Demand and raise my ele bill considerably. Side note - my EV only ele cost for a month is averaging $12-15 for both cars with total @ 1,400 miles monthly always charging Off Peak. I accidentally plugged in the Leaf on a Fri afternoon one time and charged the car at 6.6kw. That one 2 hour charge in the afternoon increased my On Peak Demand significantly & cost an additional $50!
Anyway, I called the Chevy EV Team/Specialists to ask what the Battery TMS power draw was when the car was fully charged.
I had to explain it several times as they kept trying to tell me that the battery must be charged when depleted - this is not a battery charging question.
Several times they called me back after conversing with the "EV Engineers" . Each time saying that it was variable depending on the outside temp, that it PROBABLY used ABOUT the same power as a toaster, that the battery likes to be kept at 75 deg. etc... no real answer yet.
I rephrased my question, asking about a specific temp and what is the MAX power the Battery TMS will use if the ambient air temp is 120 deg. Their answer was that the max power usage at 120v is 12amps, and at 240v is 20a. Thats the on board charger limits, not what the Battery TMS will use. I highly doubt the Battery TMS will drat 20a at 240v even with the AC compressor on.
So, I guess I will find out on my next ele bill how much power the Battery TMS is using based on my On Peak Demand.
Its unacceptable that I can not get an answer to my question, or even speak directly with the "EV Engineer", as I am forced to ask questions and get answers via a CS rep that has no idea what I'm trying to ask. The Engineers that designed and built the Spark EV should know the parameters & various power consumption rates for all the different systems on car... its not like the car built itself and know one knows how it works - frustrating!