Powerwall

The Powerwall is Tesla's rechargeable home battery, a unit that hangs on a wall, stores electricity from rooftop solar or the grid, and gives it back when the house needs power. It lets a home ride out a blackout, pull from stored energy during the expensive peak hours, or run entirely off the grid. Tesla unveiled it in 2015 as the flagship of its Tesla Energy division, and it has now passed more than 1 million units installed across over 30 countries.

What is the Powerwall?

The Powerwall is a flat, wall-mounted lithium-ion battery (a chemistry that packs a lot of energy into little weight) that stores electricity for a home. The current version, Powerwall 3, holds 13.5 kilowatt-hours (kWh, the energy a microwave uses running for about an hour) and builds the solar inverter, the part that turns solar panel output into the current your house uses, right into the battery. A single unit weighs about 130 kilograms and carries an IP67 rating, which means it is sealed against dust and water and can sit outside through rough weather.

Why the Powerwall Exists

The reasoning Tesla gave was direct. A home makes solar power during the day but needs it most at night, and the grid charges more when everyone wants electricity at once. A battery bridges that gap, storing cheap or self-made power for later, moving your demand off the pricey hours, and keeping the lights on when the utility goes down. The bigger goal, shared across all of Tesla Energy, is to speed up the switch to clean power and lean less on fossil fuels. There is a business case tucked inside that mission too: drive down the cost of each unit, sell far more of them, add ongoing solar and grid services, and energy storage becomes a business that keeps building on itself. Elon has always run his companies this way, with each product paying for the next big goal.

How it Works

A Powerwall sits between the utility meter and the home's breaker panel. Solar charges it by day, the grid tops it off when rates are low, and the battery gives that power back when the home needs it or the grid goes dark. The biggest leap from one generation to the next came in the hardware. Powerwall 1 in 2015 gave you 6.4 kWh of usable storage. Powerwall 2 in 2016 doubled that to 13.5 kWh and added a built-in inverter rated at 5 kilowatts (kW). Powerwall 3 in 2023 kept the storage the same but poured all its gains into raw power.

That jump in power is the whole reason one unit is now enough. Powerwall 2 delivered 5 kW, while Powerwall 3 delivers up to 11.5 kW, can kick on heavy motors rated up to 185 amps, and accepts up to 20 kW of solar across six inputs. Elon put it plainly: "What matters most about Powerwall 3 is that it can handle peak power of ~30kW, which is enough to handle dryers & air-conditioners. This means that a single Powerwall is now enough for most homes." Building the inverter into the battery also makes it easier to install.

The Economics of the Powerwall

The first Powerwall launched at $3,000 for the 7 kWh daily model, which gave you 6.4 kWh of usable storage, and $3,500 for the 10 kWh backup version, both before installation. The long-run math rests on a 10-year warranty that promises the battery still holds 70 percent of its capacity after a decade. For a household, the payback is the peak-rate power you never have to buy, the solar you store instead of selling back cheap, and the power that stays on through an outage. For Tesla, every install builds a lasting relationship across solar and grid services.

Current Status of Powerwall

The Powerwall is the face of a fast-growing storage business. Tesla does not break out Powerwall-only figures, so the clearest measure is total Tesla energy storage, which counts the utility-scale Megapack alongside the home battery.

That climb, from roughly 6.5 gigawatt-hours in 2022 to 46.7 gigawatt-hours in 2025, is a side business turning into a pillar. The count of batteries in driveways tells the same story.

Total Powerwall installs roughly doubled in about two years, crossing 1 million worldwide in September 2025. Gigafactory Nevada reportedly hit a record of around 1,500 Powerwalls in a single day in early 2025. The energy business it anchors is now a real part of Tesla's revenue rather than a rounding error.

What Comes Next

The next chapter is less about a single battery and more about the network they form together. Powerwall 3 scales up: stack several units and Expansion packs, and a home can reach up to 44 kW and 94.5 kWh of storage. Thousands of these batteries can be enrolled in virtual power plants, where a utility calls on home batteries all at once to steady the grid during a demand spike. As Elon noted when the team hit its milestones, a Powerwall gives a home "guaranteed continuous power during utility blackouts or brownouts," and adding solar lets a household "operate off grid." As the cost per kWh keeps falling, home storage keeps moving from an early-adopter novelty toward something as standard as the water heater.

The Bottom Line

The Powerwall changed how a home relates to the grid, from just taking whatever the utility sends to storing your own solar power and riding out blackouts on your terms. In ten years it went from a single product on a Tesla stage to more than a million units installed around the world, and the energy business it anchors keeps getting bigger.

Related

Keep reading: Solar Roof, Supercharger Network. Zoom out to the Tesla overview, or open the Tesla Lineup Explorer.