If your energy costs vary through the day, or if you are on a time-of-use rate plan, Powerwall can take that into account to maximise your savings. When electricity is expensive, Powerwall uses stored low-cost energy to power your home. Regional regulations may apply to the operation of Powerwall, which may vary some aspects of this mode.
Powerwall learns how you use energy
Powerwall has an array of electrical current sensors that monitor energy usage and solar production. Tesla’s intelligent forecasting software predicts future usage and production. Based on the varying cost of electricity from the grid, Powerwall optimises the times it charges and discharges. As Powerwall learns, you get the most value from your solar production without having to change how or when you use energy.
Select the mode for your Powerwall
From the Powerwall home screen in the Tesla app, select Customise and then Advanced Time-Based Control. Within this mode, there are two strategies: ‘Balanced’ and ‘Cost Saving’. Balanced uses stored solar to power your home when electricity is expensive and after the sun goes down. Cost Saving uses stored low-cost energy to power your home when electricity is expensive, maximising your savings.
|Powerwall Operating Mode||Backup Reserve||Self-Powered %||Savings|
|Self-powered||You set the percentage||Great||OK|
|Advanced - Time-based control (Balanced)||You set the percentage||Good||Good|
|Advanced - Time-based control (Cost Saving)||You set the percentage||OK||Great|
Set your reserve for power outages (Optional)
Your backup reserve is the minimum percentage of its capacity Powerwall keeps charged in case there is a power outage. For example, setting a 30% reserve for power outages means Powerwall will maintain at least 30% charge that is only used during an outage, while 70% of its capacity is used for cycling. You can increase or decrease the amount reserved using the ‘+’ or ‘-‘ icons.
Edit your price schedule
You can set up a schedule to let Powerwall know the times electricity is expensive (peak) and inexpensive (off-peak). Select ‘Edit Price Schedule’ and slide the start and stop times for the yellow peak hours and blue off-peak hours to match your utility rate plan. If your schedule is different on weekends and weekdays, use the week/weekend option to input a different schedule. Below are several examples of what you may find on your utility website, which correspond to peak hours of 12:00 PM to 6:00 PM and off-peak hours of 10:00 PM to 4:00 AM.
Utility Rate Information
Tesla App Price Schedule