If your home solar system is tied to your utility (grid-tied) and you don’t have a battery, your home solar system will not work during a power outage. You will not be able to produce or consume solar energy while the grid is down.
The purpose of this tool is to provide a general sense of how various lights and appliances can affect how long a fully charged battery system will last during a grid outage. To calculate how many “days” your battery will last in an outage, we divide the energy storage capacity of the installed Powerwall(s) by the sum of all selected activities’ energy consumption.
While this tool provides generalized examples, your battery system’s longevity during an outage depends on the specific characteristics of your appliances, such as the brand, model, and condition.
Miscellaneous Standby Power By default, we assume here that plugged-in devices in the home collectively consume 1 kWh of “standby power” over the course of a day (e.g. always-on uses like a printer display or microwave clock).