When I bought my Model 3 in early 2019, many reviews and general discussions claimed that the Model 3 relied on a novel method of generating cabin heat: The claim was that they scavenged waste heat from the electronics and motors; and if more heat was needed than would normally be generated, the car would run the motors in a deliberately inefficient manner so as to produce more heat. The claim was that this method of generating heat was more efficient than using resistive heaters, which many other EVs used, although it was less efficient than heat pumps, which a few EVs used.
Once Tesla added heat pumps to the Model 3 (and Model Y, which has always shipped with a heat pump, IIRC), the claim about older models suddenly changed. Online discussions and auto reviews suddenly claimed that the older Model 3 had been using resistive heaters all along. References to heat scavenging dried up.
I've never seen any discussion about why these claims so suddenly changed, and now I'm wondering which claim was true: Does my 2019 Model 3 use resistive heaters, does it use a heat-scavenging system, or does it use both? Also, if it uses heat scavenging, how efficient is that compared to resistive heaters and heat pumps?
I'm curious about this because I've gotten questions about how EVs generate heat at EV events, and with National Drive Electric week coming up, I'd like to have my facts straight.
Once Tesla added heat pumps to the Model 3 (and Model Y, which has always shipped with a heat pump, IIRC), the claim about older models suddenly changed. Online discussions and auto reviews suddenly claimed that the older Model 3 had been using resistive heaters all along. References to heat scavenging dried up.
I've never seen any discussion about why these claims so suddenly changed, and now I'm wondering which claim was true: Does my 2019 Model 3 use resistive heaters, does it use a heat-scavenging system, or does it use both? Also, if it uses heat scavenging, how efficient is that compared to resistive heaters and heat pumps?
I'm curious about this because I've gotten questions about how EVs generate heat at EV events, and with National Drive Electric week coming up, I'd like to have my facts straight.