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Living in a region were you need to warm up car for 5 minutes to stop it being an unwelcoming block of ice, and experiencing frequent failures to get the starte
by Andrew_nenakhov 4y ago
Living in a region were you need to warm up car for 5 minutes to stop it being an unwelcoming block of ice, and experiencing frequent failures to get the starter running due to discharged battery due to cold, I always wondered how much cold affects battery performance and his much the heating costs in miles. Tesla's figures look unbelievably good, and I think they don't account for heating. In -20° you'd need at least 1-2 kWt heater to not freeze, so heating alone would take 5-10% of total energy consumption.
- gocartStatue 4y agoLuckily the engines still generate plenty of heat and EVs use modern heat pumps.
- Andrew_nenakhov 4y agoTesla claims to have 90..94% motor efficiency. With model Y using 13kW per hour, even if you count all 6-10% of this as heat, and manage to capture it, it'll still be hardly enough to keep the car at a comfortable temperature without additional heating.
- gocartStatue 4y agoWell, it looks worse than I thought: https://insideevs.com/news/452464/tesla-model-y-heat-pump-system-details/amp/ https://insideevs.com/news/452464/tesla-model-y-heat-pump-sy... With home air-to-air heat pumps I took COP of 2-3 as a base for heating, it seems that COP=1 is a big deal in a car.
- throwaway290 4y agoNorway proves EV are OK in the cold. They overtook ICEs already.
- Andrew_nenakhov 4y agoNorway is a particularly bad example here because, despite its northern location, the climate is very mild, with the average winter temperature of just -6°C, while we here regularly see temperatures below -20°C and up to (or down to?) -35°C.