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Tesla Powerwall2021-07-22T09:23:34-05:00

SunPower® SunVault™

Tesla Powerwall

Tesla Powerwall

We are a Tesla Powerwall Certified Installer
A Tesla Powerwall AC battery

A Revolutionary Battery For Home

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.

What Can The Powerwall Backup?

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:

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DAY
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HOURS
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MINUTES

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

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WINTER DAY
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SPRING DAY
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SUMMER DAY

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.

Tesla Powerwall Specs: (Capacity: 13.5kWh, Weight: 276lb / 125kg, Peak Power: 7kw, Scalability: x10 Powerwalls, Continuous Power: 5kw, Warranty:10 Years, Dimensions: 44inx29inx5.5in)
WHAT INCENTIVES ARE AVAILABLE FOR BATTERY BACKUP SYSTEMS?2021-08-06T13:43:39-05:00

Tesla Powerwall systems that are connected to a solar system are eligible for the 26% Federal Solar Investment Tax Credit. The system must be installed by the end of 2022 to qualify and by the end of 2023 to qualify for the reduced 22% Investment Tax Credit.

Battery backup systems are exempt for all sales taxes. Visit our incentives page for more detailed information.

Now’s a great time to lock in your energy rate before it rises again and the incentives disappear.”

WHAT TYPE OF WARRANTY DOES A TESLA POWERWALL HAVE?2021-08-06T13:42:30-05:00
The standard Tesla Powerwall warranty is 10 years at 70% of its rated energy capacity of 13.5kWh. This means a fully charge Powerwall is guaranteed to provide a minimum of 9.5kWh during an outage.
HOW MUCH DOES A TESLA POWERWALL COST?2021-08-06T13:41:48-05:00
A one unit Powerwall system can run from $12,500 to $13,000 depending on the degree of electrical difficulty. location on the building and if you purchase with solar. Multiple unit systems come with a significant savings, a two unit system can run from $22,000 to $25,500. Visit our financing page for our $0 down low interest loan options. Don’t forget, now is the best time to go solar with battery storage before the federal tax credit starts to fade away in 2022 and disappears in 2023. This incentive is also only eligible for Powerwall systems if they are connected to a solar system.
DOES A POWERWALL AUTOMATICALLY SWITCH ON WHEN THE GRID FAILS?2021-07-21T02:26:51-05:00
Your Powerwall will operate in a grid failure and your home will automatically switch over to the batteries. If the sun is shining when the grid goes down, your solar system will continue to charge your batteries and stop sending any energy back to the grid. We are required by code to install a “gateway” unit that relays power from your system to the Powerwall and isolates all the power in the house from the grid. This ensures the safety of lineworkers and is an automatic process when the grid goes out.
HOW MANY HOURS DOES IT TAKE TO CHARGE A POWERWALL WITH SOLAR?2021-08-06T13:41:08-05:00
This is another question that’s hard to quantify. How long it takes to charge a Powerwall with solar really depends on the weather, seasonal day lengths, brightness and shading. In perfect conditions with no loads and 7.6kW of solar power, a Powerwall could charge in 2 hours. Whereas for a typical December week up to 3 full days.
HOW LONG DOES A TESLA POWERWALL BATTERY LAST ON ONE CHARGE?2021-08-06T13:39:59-05:00
This is highly variable on how many loads you use during an outage. If you use electric heat and attempt to heat the entire house at night then you’ll draining the batteries rather quickly. A more realistic assumption for one Powerwall would be to run ten 100 watt light bulbs for 13 hours (without recharging the battery).
DO I NEED MORE THAN ONE POWERWALL?2021-07-21T02:26:00-05:00

We’re seriously not trying to dodge this question, but it really is different on a site-to-site basis and from a personal preference. For most systems, we install 1 or 2 powerwalls. The total number is a personal choice depending on how much power you want or need to store and what types of devices you hope to switch on during a grid outage. Each of our systems are fully customized to maximize the homeowner’s financial benefit and to reach their goals. To get a full picture of how many powerwalls you might need, we would need to have an in-depth conversation about your objectives and review your average consumption history.

WHAT CAN YOU POWER WITH A TESLA POWERWALL?2021-07-21T02:25:39-05:00

It’s all about the give and take when it comes to planning out your home battery storage solution. When designing your energy storage system, it is essential to find a balance between the total capacity of the Powerwall(s) with the demand of everything you need to power up. Each Powerwall can deliver up to 21 amps, and up to 6 Powerwalls can be stacked together. However, even if there is enough amperage to cover all of your loads, we need to consider the pace of how quickly electricity will be drawn to maximize the effectiveness of your back-up system.

A common misconception is that your solar output will recharge your battery at the same rate you’re using it. This depends greatly on uncontrollable factors like weather and user consumption habits. An easy way to look at battery storage is to think of how driving tendencies vary by operator and by vehicle. You may be a more efficient driver of your new Prius while your cousin Karen drives a 2001 Jeep Wrangler like she’s running a desert race. Similarly, Powerwall performance will be dependent on user consumption tendencies and what you are powering up. A small, highly efficient home with energy efficient appliances might power more than a larger, older home with leaky windows. By monitoring your usage and storage abilities, you’ll gain greater insight into what you can power and how quickly your Powerwall might recharge.

Ultimately, to determine what’s best for you, we need to take a look at your average historic usage and discuss what you’re looking to get out of our battery storage.

DOES A POWERWALL NEED TO BE INSTALLED WITH SOLAR?2021-08-06T13:39:29-05:00

Not technically, but it’s hard to see the benefit of having battery storage that’s not connected to a solar system in Washington State. Unlike areas that have a high variation in on-peak and off-peak rates, think California, time-of-use load shifting isn’t financially rewarding in the Evergreen State. There is no need to store your unused solar energy since net metering allows you to store your excess production on the grid as a credit to use later. This is essentially a free energy storage vault.

Battery backup systems that are connected to a solar system are eligible for the 26% Federal Solar Investment Tax Credit. Beginning in 2022, this tax credit will step down to 22% until a full sunset in 2023. Now’s a great time to lock in your energy rate before it rises again and the incentives disappear.

HOW DOES A POWERWALL BATTERY WORK?2021-07-21T02:24:43-05:00
In basic terms, sunlight is captured by your solar panels then converted into energy that you can use for your home. As that energy flows into your house, it is used by your appliances and any excess energy is stored in the Powerwall. Once the Powerwall is fully charged, additional electricity your system generates on top of that is sent back to the grid. When the sun goes down and your solar panels are not producing energy, your Powerwall will provide electricity to power your home.
WHAT DOES A TESLA POWERWALL BATTERY DO?2021-07-21T02:24:28-05:00

Just like any other battery storage option, a Tesla Powerwall captures and stores energy to be used by your home when needed later. What makes the Powerwall standout from other battery storage options is its ability to power larger loads and for a longer duration. This means you have the freedom to power up more of what you need without running out of storage during an outage.

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.

Example Household Daily Habits

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