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One thing that is often overlooked is the vampire drain on EVs. In my experience, Tesla’s can use anywhere from 1-3 kwH every 24 hours sitting idle. The loss is
by tdiggity 5y ago
One thing that is often overlooked is the vampire drain on EVs. In my experience, Tesla’s can use anywhere from 1-3 kwH every 24 hours sitting idle. The loss is due to keeping monitoring and connectivity on. It’s not an exact science, but if you let your car sit for days then you can expect to have less range than when you left it.
Yes, they’ve made improvements (there were claims of 10+ miles of range lost per night on Model S). There is a deep sleep that seems to kick in after awhile. You can turn off mobile connectivity to help save watts.
Overtime, these little losses add up. It’s not something the car tracks, either. In fact, Tesla’s odometer omits the vampire drain and only shows you energy used while driving. You need a separate energy meter on the charging outlet, or a smarter charger that measures all power being used.
- cptskippy 5y agoI've noticed my Model 3 loses several miles a day. On the other hand my Leaf can sit for a week or more and show no loss.
- rektide 5y agoa car burning 100w sitting there idle (2.4kWh/day) is ridiculous. I hope this isn't right.
- tdiggity 5y agoSearch Tesla vampire drain, it’s a thing. The calculation is muddied even more because the tesla odometer doesn’t monitor two important things: vampire drain, and charging inefficiencies. The odometer only tracks power while your butt is in the seat (so if you park the car and use the ac, it will track that). This makes long term cost tracking hard: you can only depend on the miles driven metric from the car. You’ll need a separate meter to track total energy used to account for inefficiencies (power lost to heat and conversion) and vampire drain. The car shows kWH used since last charge, and it almost never matched what my smart meter measures if the car has sat for days.
- tdiggity 5y agoI’ll also add that some people ignore this (or are obvious to this) because the car has 300+ miles of range. What’s a few miles lost the next morning? /s no big deal. I’m a big tesla fan. But, sometimes the math doesn’t work. Especially if you aren’t driving it everyday.
- orwin 5y agoI can definitly be more if you let your Tesla out in the sun. The Tesla will protect it battery by cooling them appropriately. So active monitoring + cooling, 2.4 kWh/day is appropriate.
- cyberge99 5y ago1-3kwH every 24 hours would be between 41 or 51 watts per hour, correct?