Decoding 3,200 km of Tesla Telemetry: Temperature vs Efficiency, AC/DC Charging Losses, and the Truth About Vampire Drain
A deep dive into 3,252 km of real-world driving, 600 kWh of charging, and 750+ hours of parking telemetry collected via self-hosted TeslaMate on a private home NAS. Featuring an exact 158.8 km controlled experiment on cold weather efficiency penalty, AC vs DC charging losses, Sentry Mode phantom drain, and 9,600 km LFP battery health.
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This article reflects personal experiences and opinions as of the date of publication.
Table of Contents
- Debugging an EV with Ground-Truth Data, Not Anecdotes
- 1. Dataset Overview & Analysis Pipeline
- 2. [Drives] Ambient Temperature vs Efficiency: An Exact 158.8 km Controlled Experiment
- 1) A Controlled Highway Corridor: 20.1°C vs 7.6°C
- 2) Urban Congestion vs Highway Cruising Efficiency
- 3. [Charging] AC vs DC Charging Efficiency: The Truth Behind Inverter Losses
- 1) Why DC Fast Charging Loses Less Than Half the Energy
- 2) Output Matters: 3 kW vs 7 kW AC Charging
- 4. [Parking] The Reality of Vampire Drain: Sentry Mode vs Deep Sleep
- 1) Sentry Mode Active: 240 Watts of Continuous Compute
- 2) Deep Sleep: True Phantom Drain is Practically Zero
- 5. [Longevity] LFP Battery Health After 9,622 km: A Remarkable 0.6% Degradation
- The LFP Voltage Plateau & Calibration Cycles
- 6. Epilogue: The Power of Owning Your Data
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