I've had a Tesla Powerwall for a bit now, and I've noticed that the "Solar Generation" number in the app is always lower than the solar generation number given to me by the MySunpower (solar system) app. For instance on 6/17 the Tesla App says 24.7 kWh were generated, while the Sunpower app says 39.6 kWh was generated. This is obviously a large difference. I only have one Powerwall, and it uses a sub panel to connect to most of the rooms in my house (not all), but it seems really unlikely that the few rooms I don't have are consuming 15 kWh per day (especially since they're bedrooms that no one is in during the day). Any ideas what is going on here?