(206) 297-0086
  • Google
  • Instagram


Tesla Powerwall Certified Installer

Tesla Powerwall Certified Installer

Sunergy Systems is a proud Seattle based Tesla Powerwall Certified Installer. 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, when combined with a solar energy system, your Powerwall might be eligible for sales tax exemption and will be eligible for the 26% Federal tax credit.

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

Our Powerwall FAQ has answers to all your Tesla Powerwall questions in one place to learn about Tesla Powerwall specs, how battery + solar works, & more!

Sunergy Systems is one of a select few solar installers in the greater Seattle area to be a Tesla Powerwall Certified Installer. We also provide other battery back-up solutions; to find the right solution for you, call us today at (206) 297-0086 for a free consultation.


What Can The Tesla Powerwall Do?

"System Specifications" Three columns Column 1: An icon of a house with a directional arrow wrapping around the outside - 1 Number of powerwalls. Column 2: An icon of a Power line tower crossed out with kW next to it - 5.0 storage continuous power capacity Column 3: An icon of a battery with kWh inside of it - 13.5 storage energy capacity.

Example Household Daily Habits

Chart with 4 columns describing a typical households appliances and power consumption in a day. Electrical Load - Refrigerator (21 cu. Ft.) Quantity 1 Time "ON" per day N/A Energy per day 1.62 kWh Electrical Load - Microwave Oven Quantity 1 Time "ON" per day 60 Minutes Energy per day 1.50 kWh Electrical Load - Stove (3-Burners - Medium) Quantity 1 Time "ON" per day 20 Minutes Energy per day 1.25 kWh Electrical Load - Pots of Coffee Quantity 1 per day Time "ON" per day N/A Energy per day 0.12 kWh Electrical Load - Toaster (2 slices of bread) Quantity 1 per day Time "ON" per day N/A Energy per day 0.04 kWh Electrical Load - Heater Furnace Blower Quantity 1 Time "ON" per day 5 hours Energy per day 2.50 kWh Electrical Load - Light Bulbs (10W) Quantity 10 Time "ON" per day 5 hours Energy per day 0.50 kWh Electrical Load - TV (60"") Quantity 1 Time "ON" per day 6 hours Energy per day 0.45 kWh Electrical Load - Laptop (Medium) Quantity 2 Time "ON" per day 4 hours Energy per day 0.28 kWh Electrical Load - Charge your Phone Quantity 2 per day Time "ON" per day N/A Energy per day 0.03 kWh Electrical Load - Modem/Router Quantity 1 Time "ON" per day 24 hours Energy per day 0.48 kWh Electrical Load - Security System Quantity 1 Time "ON" per day 24 hours Energy per day 0.60 kWh Electrical Load - Blow-dry your hair Quantity 1 Time "ON" per day 10 minutes Energy per day 0.25 kWh Electrical Load - Phantom Loads Quantity 1 Time "ON" per day 24 hours Energy per day 1.02 kWh Total 10.82 kWh

How Long Will Powerwall Last In A Power Grid Outage?

Powerwall stores 13.5 kilowatt-hours (kWh) of usable electricity and will recharge using solar power (when installed). Based on the above daily habits, a fully-charged Powerwall will provide the following duration of power during a power grid outage:




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


Winter Day


Spring Day


Summer Day

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 a power 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.