Tesla Powerwall

Tesla Powerwall Certified InstallerSunergy Systems is a proud Tesla Powerwall Certified Installer, which means we offer a customized solar-plus-battery solution that enables you to access the free, abundant power of the sun when you need it the most for back-up power in the event of a grid outage. Plus, if combined with solar, then it too is eligible for the 30% Federal tax credit.

Each Powerwall consists of a lithium-ion battery pack, liquid thermal control system, and integrated inverter and software. The unit mounts seamlessly on a wall or on the ground, indoors or outdoors.

Sunergy Systems is one of a few companies in the greater Seattle area to be a Tesla Powerwall Certified Installer. We also provide other back-up solutions, to find the right solution for you, contact us for a free consultation.

What can Powerwall do?

Powerwall Specifications


Example Household Daily Habits

Powerwall calculator

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). Based on the above daily habits, A fully-charged Powerwall will provide the following duration of power during an outage


Powerwall backup hours


When coupled with a 6.5kW solar energy system, in the Puget Sound region, the duration may be increased by


Powerwall and solar


How do we calculate energy usage?

These estimates provide a general sense of how various electricity-using activities affect how long a fully charged Powerwall battery system will last during a grid outage. Different activities are assumed to be spread out over time (rather than all at the same instant) , so as not to exceed a Powerwall’s peak power delivery. 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 estimate 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.