How long will Powerwall last in an outage?
Powerwall stores 13.5 kWh of usable electricity and will recharge using solar power (if you have it). Discover how long a fully-charged Powerwall will last in an outage by selecting your daily habits.
How do we calculate energy usage?
The purpose of this tool is to provide a general sense of how various electricity-using activities affect how long a fully charged Powerwall battery will last during a grid outage. Different activities are assumed to be spread out over time (rather than take place at the same instant) , so as not to exceed a Powerwall’s peak power delivery of 7 kilowatts. To calculate how many “days” your Powerwall 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.
A “day” in this tool represents a household’s variety of selected activities within a single 24-hour period. However, depending on the timing of these activities, the Powerwall’s stored energy may be depleted in a number of hours that is considerably less than 24 hours. While this tool provides generalized examples, your Powerwall’s longevity during an outage depends on the specific characteristics of your appliances, such as the brand, model, and condition.
Toaster Making two slices of toast uses approximately .04 kWh of electricity.1 | Brew some Coffee Brewing one pot of coffee uses approximately 0.12 kWh.1 | Take a 10-minute shower Heating enough water for a 10-minute shower uses approximately 3 kWh (using an electric water heater).2 | Blow-dry your hair Blow-drying your hair for 10 minutes uses approximately .25 kWh.1 | Wash your clothes Washing your clothes in a cold-rinse cycle uses approximately 0.3 kWh.3 | Dry your clothes One load of laundry in the dryer will use 2.5 kWh (using an electric dryer).1 | Vacuum Vacuuming for 15 minutes uses approximately 0.19 kWh.1 | Do the Dishes Running your dishwasher in energy-saver mode will use 0.5 kWh.1 | Top off your EV 7.6 kWh will fuel approximately 20 miles of driving in a Model S. We recommend at least 2 Powerwalls if you plan to use Powerwall to charge your electric vehicle.4 | Charge your iPhone In an outage, we thought it would be helpful to have some extra battery power. Charging your phone 4 times uses approximately 0.06 kWh.5 | Charge your laptop Charging your laptop two times uses approximately .55 kWh.1 | Playing Xbox 360 One hour of gaming gaming uses approximately 0.15 kWh.1 | Watch TV Watching 2 hours of television on a 49” LCD screen uses approximately .02 kWh.1 | Binge-watch TV Outages can be tedious. Watching 6 hours of television on a 49” LCD screen uses approximately .07 kWh.1 | Keep the Lights on Six hours of 10 LED indoor light bulbs at 10 watts each uses 0.6 kWh. | Keep the Fridge Running No puddles under the fridge here. A medium size (17.6 to 22.5 cubic feet) fridge uses 1.53 kWh per day. | Pool Filtration Pump A pool filtration pump with a 1.3 kw capacity in use for 5 hours will use 6.5 kWh. Note that this is not a pool heating pump because when Powerwall is eligible for the Federal Income Tax Credit, it cannot be used to heat a pool. | Wi-Fi A modem and router uses 0.48 kWh over a 24 hour period. | Turn on the A/C A/C electricity usage is highly dependent on the size of the home and type of A/C unit. A central 3-ton A/C unit running for 3 hours will use 9 kWh. | 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).
What is a kilowatt-hour (kWh)?
A kilowatt-hour is the metric used to measure electricity usage. It represents the electricity used by 1 kilowatt (equal to 1000 watts) of power consumption (e.g. the approximate power draw of a microwave) for one hour.