Does anyone here have a PowerWall without solar? I want to know if the Time Based, Cost Saving mode is available in such a system, and how it behaves.
My guess is that PowerWall would charge from the grid beginning at the end of peak (or partial peak) periods, until it is fully charged. Then it waits untill peak period starts, when it begins to discharge at the same rate the house consumes power, making the draw from the gird go to zero. It would continue discharging until it gets down to the reserve level or the peak period ends. This would allow the customer to time-shift his draw from the grid to off-peak times, saving him money and reducing peak demand on the grid, a win-win situation, as well as providing backup during all but extended grid outages. This is my guess, but Tesla and installers have been unable able to confirm this, because there are so few non-solar customers.
I ask this because a friend, who is not able to get solar, is considering a PowerWall, and asked me to help him calculate the savings he could expect with a PW under the various time-of-use tariffs available to him.
I do have solar, and PowerWall charges only from solar, except when Storm Watch is active when it charges from the grid. On sunny days here in October, our solar production is more than enough to fully charge the PW and thus allow us to use gird power only during off-peak hours. Cloudy or short winter days will result in inadequate charging, of course, and hence some peak price consumption.
I would appreciate any feedback on this, especially from someone with experience or specific knowledge of non-solar installations.
Thanks,
SW
My guess is that PowerWall would charge from the grid beginning at the end of peak (or partial peak) periods, until it is fully charged. Then it waits untill peak period starts, when it begins to discharge at the same rate the house consumes power, making the draw from the gird go to zero. It would continue discharging until it gets down to the reserve level or the peak period ends. This would allow the customer to time-shift his draw from the grid to off-peak times, saving him money and reducing peak demand on the grid, a win-win situation, as well as providing backup during all but extended grid outages. This is my guess, but Tesla and installers have been unable able to confirm this, because there are so few non-solar customers.
I ask this because a friend, who is not able to get solar, is considering a PowerWall, and asked me to help him calculate the savings he could expect with a PW under the various time-of-use tariffs available to him.
I do have solar, and PowerWall charges only from solar, except when Storm Watch is active when it charges from the grid. On sunny days here in October, our solar production is more than enough to fully charge the PW and thus allow us to use gird power only during off-peak hours. Cloudy or short winter days will result in inadequate charging, of course, and hence some peak price consumption.
I would appreciate any feedback on this, especially from someone with experience or specific knowledge of non-solar installations.
Thanks,
SW