The ‘Impact’ screen on the Tesla app provides you with cards that help measure the high-level impact and performance of your solar and Powerwall systems. Tap the timescale selector on the top right of the screen to change the time period for all impact cards.
The ‘Self-Powered’ card measures self-sufficiency, or how effectively solar and Powerwall power your home without the need to use energy from the grid. A ‘Self-Powered’ value of 100% indicates that your home is fully powered by stored solar rather than energy from the grid.
The 'Energy Value' cards estimates the value generated by your Solar and Powerwall system.
Energy Value is the estimate of the value of solar energy generated at your home, based on the price of energy from your tariff, which may vary throughout the day. This estimate accounts for your own solar consumption, and the exports to the grid for the value of the electricity on your tariff.
Energy Value also accounts for the additional value that your Powerwall generates by storing solar energy and lowering your consumption from the grid.
The ‘Solar Offset’ card contrasts your system’s solar generation against your home’s energy usage. Your ‘Solar Offset’ value can be higher than 100%, indicating that your system is producing more solar energy than your home is consuming — this typically occurs during the summer months. A low ‘Solar Offset’ value may indicate that you need to install more solar to fully cover your home’s energy usage. Viewing your ‘Solar Offset’ card by the ‘Year’ timescale can help you identify seasonal effects on solar production.
The ‘Backup History’ card displays events in which your Powerwall has powered your home during a grid outage. By default, this card only shows events during the selected timescale, but you can tap ‘View All Events’ to see backup events throughout the lifetime of your system.