16 February

Diagnostics on the Powerwall after more than a year of use. You can see they’re sold as a capacity of 13.5kWh, but you can end up with more, as ours is, 14.7kWh. And 0% degradation for the battery after more than a year is fantastic, means it hasn’t lost any capacity to charge. It’s warranted to hold 70% of its original capacity even after 10 years, which is still ample storage for most homes. (‘Energy remaining’ means today, battery currently charging.)