solar battery storage from Tesla

Feeling Powerless? Moxie Up with Tesla Powerwall and Solar

Powerwall Energy Storage Batteries Are a Clean, Effortless, and Cost-Effective Alternative to Generators

tesla powerwall

Whether caused by a hurricane, wind storm, ice storm, or other unforeseen events, power outages create a number of unwanted headaches for homeowners. If you don’t have a quick, reliable, and sustainable backup power source, loss of food, communication, comfort, and safety soon follows.

Generators have traditionally been the go-to solution for extended power outages, but recent advances in battery storage technology have resulted in a much smarter solution: energy storage batteries such as Tesla Powerwall. When combined with solar panels, Tesla Powerwall can help you keep your lights on and fridge cold no matter how long a power outage lasts.

Tesla Powerwall vs Generator

Battery backups, like Tesla Powerwall, offer the same backup power ability as conventional gas, diesel, or propane generators, without the need for refueling. But the advantages of Powerwall don’t stop there.

Advantages of Powerwall:

  • Automatically turns on when power outage detected
  • No loud motor or operating noises
  • No need to refill with fuel
  • Zero maintenance requirements
  • Completely weatherproof and safe to touch
  • Option to connect up to 10 batteries for additional power

What does Tesla Powerwall do?

With this industry-leading home energy storage system, your ability to consume and utilize clean energy from the sun is nearly limitless. The Tesla battery pack can store surplus solar energy during the day and use that energy later when the sun is not shining.  What makes the Powerwall different from other battery storage options currently on the market is its capacity to support larger loads, which means you have the freedom to power up more of what you need. You would be hard-pressed to find an energy storage battery with more capacity and overall performance than Tesla Powerwall.


Courtesy of Tesla

How does Tesla Powerwall work?

It’s very similar to a generator but uses 100% renewable energy. 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. When the sun goes down and your solar panels are not producing energy, your Powerwall will provide stored electricity to power your home. 

What can you power with a Tesla Powerwall?

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’s essential to find a balance between the total capacity of the Powerwall(s) with the demand for everything you need to power up. Each Powerwall can deliver up to 21 amps, and up to 10 Powerwalls can be stacked together. However, even if there is enough amperage to cover all of your loads, you need to consider the pace of how quickly electricity will be drawn to maximize the effectiveness of your back-up system.

Does Powerwall automatically switch on when the main power grid goes out?

On a typical day, Tesla Powerwall and solar will meet most of your home’s energy needs. When the grid goes down, solar energy will continue to power your home and charge your battery. The battery can detect an outage, disconnect from the grid, and send power to your home in a fraction of a second. Your home energy system will continue to run without interruption. If you have solar and battery backup, energy will continue to power your home and recharge Powerwall. 

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 also what allows you to continue powering your home during an outage.

solar battery storage from Tesla
Courtesy of Tesla

What is the Storm Watch feature on Tesla Powerwall?

Storm Watch automatically detects incoming storms and prepares for them by keeping energy stored in the Powerwall. For Powerwall customers with backup in selected regions, Tesla will automatically detect incoming storms and charge the Powerwall up completely to ensure power is available in the event of a weather-related grid outage. Owners can manually turn this off from the app, if desired.

What’s the best place for Powerwall to be installed?

Tesla’s Powerwall can be installed as a ground-mount installation or mounted to a wall, depending on what’s best for your location. It is touch-safe, meaning it doesn’t need any special clearances nor does it come with any specific safety setbacks. The Powerwall is also water-resistant and dustproof, making outdoor installations an option in most locations.

Batteries are heavy and so is the Powerwall 2, tipping the scales at 269 pounds. At just 6.1 inches thick, the Powerwall 2 is much heavier than it looks like it would be, thanks to the bulk of the volume being filled with batteries. Overall, the Powerwall 2 has a footprint of 45.3 in x 29.7 in x 6.1 in, making it slender enough to mount to a wall without being obtrusive, but large enough to pack in some serious storage capacity.

On the wiring side, there are two primary configurations for how the Powerwall 2 is wired into the home. If the Powerwall 2 will only be used to provide backup power to essential loads in the home, a new sub-panel is required to connect the Powerwall 2 to the specific circuits in the home that will have power in the event of a grid outage.

powerwall home backup battery
Courtesy of Tesla

On the other hand, when the Powerwall 2 is wired into the entire home to be used as a whole home backup solution, it is wired directly into the main electrical panel of the home. In this configuration, only the Powerwall(s) and the Backup Gateway are added — a new sub-panel is not required.

whole house energy backup tesla powerwall
Courtesy of Tesla

How many Powerwalls do I need?

In very general terms, one Powerwall should be able to cover your emergency circuits, lights, and outlets. If you are looking to power larger appliances 2-3 Powerwalls is a good start. 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 a battery storage system.

What type of warranty does a Tesla Powerwall have?

The standard Tesla Powerwall warranty is 10 years at 70% capacity. This means that if the Powerwall loses more than 30% of its storage capacity within 10 years it would be covered by the warranty.

Install Powerwall with MOXIE

MOXIE is a Certified Tesla Powerwall Installer with hundreds of successful Tesla Powerwall and solar installations completed. With our expert in-house electricians and PV installers, we make it easy for you to turn your home into a self-powered green home with 100% hassle-free, renewable backup power. Contact MOXIE today to learn more about adding Tesla Powerwall and solar or for your free, no-obligation quote. Call 855-669-4387 or fill out our quick contact form.

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