Whether you’re tired of paying sky-high electric bills or want to reduce your carbon footprint, home solar systems are becoming increasingly popular across the country. But what happens when the sun goes down or the power goes out? Enter the Tesla Powerwall, a game-changing home battery system that allows you to store solar energy for later use, provide backup power during outages, and even minimize your reliance on the grid. In this article, we will explore everything you need to know about the Tesla Powerwall, its key features, and how it can benefit you as a consumer.


What is the Tesla Powerwall?

The Tesla Powerwall is a rechargeable lithium-ion battery designed to store excess energy generated by solar panels for later use. As an AC-coupled battery, it comes with its own integrated AC inverter, making for an easy installation process, and can even work without solar panels, drawing charge from the grid alone. The Powerwall is available in two models, each with a 13.5 kWh capacity, and promises to be a reliable solution to the problem of power outages and rising energy bills.


Tesla Powerwall: What You Need to Know

Key Features

The Tesla Powerwall boasts an impressive list of features that make it stand out from other home battery systems. These features include:

  • Energy independence: With the Powerwall, you can rest easy knowing that you have backup power during outages caused by storms, blackouts, or even natural disasters.
  • Solar energy storage: The Powerwall allows you to store excess solar energy during peak hours so that you can use it later when needed, reducing your reliance on the grid.
  • Lithium-ion battery: Lithium-ion batteries are known for their long lifespan, safety, and reliability, making them a popular choice for home battery systems.
  • Tesla app: With the Tesla app, you can monitor your Powerwall’s charge level, power flow, and energy usage from anywhere in the world.
  • Power output: Depending on the weather conditions, the Powerwall can deliver between 7 kW and 9.6 kW of output during a blackout, making it a reliable backup power source.
  • Federal solar tax credit: The Powerwall is eligible for a federal tax credit of up to 26% of the cost of installation, making it an affordable option for many homeowners.

Battery System

The Tesla Powerwall uses a lithium nickel manganese cobalt oxide (NMC) battery, a type of lithium-ion battery known for its high energy density and long cycle life. The Powerwall’s battery system is designed to be stackable, allowing you to add additional units as needed to increase your storage capacity. The battery has a round-trip efficiency of 90%, meaning that 10 kWh of energy stored in the battery can produce 9 kWh of usable electricity.

Powerwall Models

The Tesla Powerwall is available in two models: Powerwall and Powerwall+. Both models offer the same storage capacity of 13.5 kWh, but the Powerwall+ comes with a Tesla solar inverter, making it a great choice for those building their solar system from scratch. The Powerwall has three operating modes:

  • Self-powered mode: The Powerwall stores energy from your solar panels or the grid during off-peak hours to use later when energy consumption is high.
  • Backup mode: In the event of a power outage, the Powerwall automatically switches to backup mode, providing seamless power to your home.
  • Time-based control mode: The Powerwall can be configured to charge during off-peak hours when energy is cheaper and discharge during peak hours, reducing your energy bill.

Tesla Powerwall Cost

The cost of a Tesla Powerwall can vary depending on several factors, such as location, energy usage, and installation costs. The base price of a single Powerwall unit is around $8,000, excluding installation costs, and the Powerwall+ costs around $11,000. However, the federal solar tax credit can offset some of these costs, making the Powerwall an affordable option for many homeowners.

Solar Installation and Solar Panels

Before installing a Tesla Powerwall, you will need to have solar panels installed on your property. Solar panels capture energy from the sun and convert it into electricity, which can be stored in your Powerwall for later use. Solar installation costs can vary depending on the size and location of your property, but the benefits of solar energy, such as reduced energy bills and a smaller carbon footprint, make it a worthwhile investment.

Solar Battery: Energy Storage and Power Output

The Tesla Powerwall can store up to 13.5 kWh of energy, enough to power an average American household for about half a day. However, the battery can power different appliances for different amounts of time, depending on the energy usage of those appliances. During a power outage, the Powerwall can deliver between 7 kW and 9.6 kW of output, enough to power essential appliances such as refrigerators, lighting, and computers.



If you’re considering a home solar system, the Tesla Powerwall is an excellent choice for energy storage and backup power. With its advanced features and reliability, the Powerwall can provide a cost-effective solution to sky-high energy bills and power outages. As a consumer, it is essential to understand the key features of the Tesla Powerwall, its battery system, cost, and installation requirements. With this knowledge, you can make an informed decision and enjoy the many benefits of solar energy.

As a leading solar company in Charlotte, NC, Solar Boy Energy offers a wide range of solar installation services, including Tesla Powerwall installation. With Solar Boy Energy, you can enjoy the benefits of solar energy, reduced energy bills, and increased energy independence. Contact Solar Boy Energy to learn more about our services and options for backup power.