Musk said Tesla was confident it would have excellent integration between Powerwall and Tesla Solar (retrofit and roof) before the end of 2021.

Promise due by 2021-12-31. TRUE: by that date Tesla offered Powerwall integrated with both its retrofit solar panels and Solar Roof. Integrated means sold and installed as one system, for example with a shared or built-in solar inverter, unified control and monitoring in the Tesla app, or a combined product such as a Powerwall with integrated solar inverter. The word 'excellent' is not a separate quality bar. MOSTLY TRUE: such integration was available for both product lines by the deadline, with a minor detail missing. MOSTLY FALSE: integration was delivered for only one of the two product lines by the deadline, or it arrived only after 2021. FALSE: Tesla communications, product documentation or dated reporting from around the end of 2021 or later show that Powerwall and Tesla Solar still worked as separate, non-integrated systems at the end of 2021.

Set before the research began.

1. E1 Tesla Solar price hikes to be reversed, court documents state Teslarati · 18 September 2021

   “Solar Roof requires the purchase of a Tesla Powerwall battery, which stores additional energy accumulated from the solar roof to prevent blackouts and outages.”

2. E2 Tesla Solar price hikes to be reversed, court documents state Teslarati · 18 September 2021

   “Tesla Solar Roof and Solar Panels to be sold exclusively integrated system with Powerwall batteries”

3. E3 Software Updates | Tesla Support Tesla · July 2021 Own record

   “Tesla App Version 4.0.0 From Powerwall, to solar panels and Solar Roof, view your system’s real-time Power Flow on the home screen of the app — featuring a 3D home with components that reflect your solar system”

4. E4 Tesla Solar price hikes to be reversed, court documents state Teslarati · 18 September 2021

   “However, Powerwall production was stunted due to microchip shortages.”

Teslarati reported in September 2021 that Tesla Solar Roof and solar panels were to be sold only as an integrated system with Powerwall batteries, and that Solar Roof required a Powerwall purchase (E2, E1). Tesla's support page for App Version 4.0.0, dated July 2021, shows unified real-time Power Flow monitoring covering Powerwall, solar panels and Solar Roof (E3). Unified monitoring in the Tesla app covering Powerwall, solar panels and Solar Roof [E3], dated July 2021, matches one of the criteria's examples of integration before the end of 2021; Teslarati also reported in September 2021 that Solar Roof required a Powerwall purchase [E1] and that both solar product lines were to be sold only as an integrated system with Powerwall [E2], without giving a date for when that took effect. The Powerwall chip shortage reported in E4 does not show that the two systems still worked separately.