I have the same 2-8 peak period, and I'm in the same boat in regard to wanting to charge our car overnight during off peak, and I have enough extra solar and PW capacity that I'm okay running the house beyond just peak when the battery is at a medium-to-high level of charge. I wish the PW let us do this via the app, as you say via a power user mode or something. However, without that, I accomplish essentially the same goals you have by using Darwins excellent Powerwall Manager app for SmartThings. (requires SmartThings hub, and there are various posts on TCM about
Darwins app). I already had a smarthings hub to optimize and automate my house around peak/off-peak Utility periods.
So currently I have the system in "Balanced" mode, with Peak defined as 2-8pm, and I accomplish essentially your same goals and its worked every day for weeks with no issue (except when I had an inverter's failure recently - different story). The first few days it seemed wonky but once I stopped changing modes for a few days, it settled in and work as expected. My main difference from your scenario is I'm okay with the Powerwall running the home before peak during the day while it recharges the PW, so from Sunrise until peak (at least in the winter when I have much more solar and battery than my house needs to cover the peak period) I set a shoulder period from around 7am ending at the same time as Peak ends at 8pm. The final piece needed to make this work, in lueue of the Tesla App enabling this, is I use Darwins app to schedule the PW reserve to change in coordinations with my shoulder and peak times, so I use his app with the SmartThings hub to do the following:
Tesla App Powerwall Settings:
- Peak: 2pm to 8pm
- Shoulder: 7am to 8pm. (for your desired goal you'd probably set shoulder to 2pm to 3am)
Smarthings Powerwall Manager App Scheduling of Reserve (to change in coordination with my off/peak/shoulder schedule), and force certain PW usage behaviors:
- At 8pm each day, when my peak ends, I scheduled reserve to go to 100%.
This has the effect of telling the PW to not power the house on battery, at the time I want my car to start charging from the grid on off-peak rate time, starting at 8pm. It's worked every time. One Noteable exception... it seems like there is a bug where if I turn off "Stormwatch" in the app the Balanced/Reserve mode settings and scheduling don't seem to work correctly, regardless of using the Powerwall Manager app or not. So I simply leave Stormwatch on now. It's not really needed where I live, so I'd prefer Tesla not to override my system with Stormwatch, but for now the Balanced/Shoulder schedule only seems to work correctly for me with Stormwatch turned on. My PW version is 1.40.2.
- At 7am I scheduled my reserve to go down to 50% (from 100% overnight). when my solar starts producing (and at the same start time as my defined Tesla App shoulder period),
This has the effect of allowing the battery to power my home during my defined shoulder period as long as reserve is over 50% (which in winter it always seems to be) but provides a safety net in case for some reason the PW SOC went very low. In addition, because this is a "Balanced/Shoulder" period, the house is powered first by Solar, with extra going to the battery, and any extra after that going to the Grid once the battery hits 100% (giving me a billed kWh offset). During this time more is going to the PW to charge it than my house uses by like a 3 to 1 ratio except for little blips like hair driers, microwave, etc. In the winter, with this scenario, my PW still ends up fully charged by the time my peak starts at 2pm. (As my AC usage ramps up next summer and starts to put a heaver load, I'll raise the morning reserve back to 75% or 90% as I had it early this month, forcing more solar to go to charge the PW up to at least the higher reserve to make sure the AC doesn't drain the PW before Peak rolls around, but still allowing extra solar to power the house, and possibly return to the grid for offset credit.)
- At 2pm (when my peak period starts), I schedule my reserve to go to 0%.
(again via Darwins PW Manager app as is the case in all four of these steps) to guarantee the house is powered by Solar and PW only during my 2-8pm peak.
- At 8pm.. goes to step one above, where I set reserve to 100%, which forces the house to power from the grid, to charge my car.
A couple notes on changing modes and reserve levels. I do actually "schedule" the reserve to change about 30 minutes before (or after) the defined shoulder periods, just to make sure it's in affect by the time the PW Peak/Shoulder schedule activates. Power reserve changes seem to go into effect more quickly, and more consistently than "Balanced/Cost-Saving" mode changes - which seem to discombobulate the system for hours or more at time. If you change the the "Self-powered/Balanced/CostSaving/Bakcup" modes, I don't think you can just watch if for a few hours to truly know what it's going to do. You kind of have to let the "Balanced/Cost-Savings" modes to sit for 1-3 days before you'll see them behave consistently - at least that's been my experience on my system, but I've heard others report the same.