https://protonsforbreakfast.wordpress.com/2025/01/10/powerwall-battery-degradation-winter4/
After 4 winters, the capacity of my Tesla Powerwall 2 is declining by around 0.4 kWh per year i.e. about 3% of its nominal 13.5 kWh capacity.
Round Trip Efficiency approaches 90% in winter, but falls to 80% in summer.
Do you have any similar data?
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