If Powerwall has less than 10% energy remaining, it will enter a standby state. Powerwall will automatically attempt to recharge from solar for 6 minutes every hour between 8 am and 4 pm local time. If enough solar is available to charge Powerwall, it will remain on. Otherwise, it will turn off and wait for the next hour.
As you may be aware, your solar system will not run if the grid is down. This means that the batteries have to ‘trick’ the solar system into thinking the grid is up. It does this by creating a micro-grid at your home. Solar will not start producing until it has observed a stable grid for at least five minutes.
When your battery system exits this standby state in the morning, it must run all your backed up loads for five minutes before solar starts producing. When solar starts producing, it MUST be producing more than your home is using. If it is not, then your battery system would have to continue to discharge to run your backed-up circuits, further draining your battery. Since it is already at a critically low state, the battery system will shut back down to preserve the remaining energy so it can attempt this restart procedure when there is enough solar to run your home AND recharge the battery system. If your home runs for 6 minutes at 8am and then turns back off, it means your home was using more power than your solar was producing and the system has shut back down to preserve what energy remains in the battery system.
Therefore, it is critical that your home’s usage is LESS than your solar production when the battery system attempts to restart the solar system. You can help ensure this happens by turning off as many backed-up circuits as possible. This way, when the battery restarts the solar system, your usage will be lower, and your system will have the best chance to remain on, recharge the battery system, and power your home. As your solar system starts producing more power, you can turn more loads on.