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How does Backup work?
In the event of a utility power outage, the Backup Gateway immediately disconnects the home electrical system from the utility and restores power to the home. Whereas a traditional solar system typically shuts down during a grid outage to prevent any power from going back into the grid, because the Backup Gateway manages the grid connection, solar can continue to operate. Powerwall is able to coordinate its charge and discharge based on home usage and solar production, while curtailing solar production when necessary.
How does Self-Powered mode work?
In Self-Powered mode, Powerwall charges from the excess solar energy generated during the day, and discharges to power your home at night.
When solar is producing more power than the home is using, Powerwall captures and stores that energy. When the home is consuming more energy than solar is providing, Powerwall discharges enough energy to offset the home usage. If solar is producing more than Powerwall can store, or the home needs more than Powerwall can provide, the remainder is automatically exported or imported from the grid respectively.
How does Time-Based Control work?
Time-based control makes use of an energy forecast to optimize the operation of Powerwall.
The energy forecast learns the patterns of your home energy use and seasonal solar production to maximize the value of your energy. If you are forecast to buy high-cost energy, Powerwall prioritizes charging during low-cost times and discharging during high-cost times.
But if the reserve is set to 100% in Self-Powered Mode, it means that it will not discharge any stored solar energy for self consumption, right? So, it is equal to Backup Mode?In other words, Backup Mode reserves 100% of your battery for grid outages, where Self-Powered Mode allows the battery to discharge to a set reserve level for self consumption of stored solar energy.
100% of your Powerwall is reserved for backup at all times
Charging Priority: 1) Any Solar
Discharging Priority: * Only during grid outage
Use stored solar to power your home after the sun goes down
Charging Priority: 1) Excess Solar
Discharging Priority: 1) Net Usage
Yes. In theory, if the reserve level was set for 100%, Self-power Mode would effectively equal Backup Mode. I am not sure why you would want to set the Self-Powered Mode to 100% reserve. It is easier to set Self-Powered Mode to say 30% and tap on screen between the two modes as needed.
From my experience, the charging rate (when solar is connected) is the same if the battery is full. If the battery in not full, there is a difference in charging priority (rate), per the Tesla FAQ:
Furthermore, the PW will charge at a lower sustained rate when there is no solar and the PW is charging from the grid. I recall seeing in forum posts in the 1-2 kW? range.
Where did you get the table re charging and discharging priorities? My PW starts to charge and then appears to get distracted and moves to discharge under the net usage priority - this before the battery has fully charged with Solar.