Powerwall System Design

Components that make up a Powerwall System

A Powerwall installation includes at least one Powerwall battery, a Backup Gateway and standard electrical hardware such as circuit breaker panels, conduit, junction boxes, or electrical disconnects as required by your particular installation and local electrical codes. In some cases, conduit and other electrical hardware can be hidden within the wall for an additional cost.

Designing for Whole Home Backup

When designing your system, Tesla will recommend the number of Powerwall units needed to back up your entire home (whole home backup). This means that during a power outage, your Powerwall system would be able to support all your appliances. You can then add more Powerwall units to keep your house operational during longer outages.  

If you order multiple Powerwalls for your system, they can be mounted as single side-by-side units on a wall or on the floor, or stacked front-to-back (up to 3 deep per stack) and mounted on the floor only.

Side-by-Side Mounting

When mounted side-by-side on a wall, Powerwall units must have enough clearance on each side for electrical connections and proper ventilation. 

Front-to-Back Mounting

When stacked front-to-back, Powerwall must be floor-mounted and the stack must be anchored to an adjacent wall, and the Powerwall units must be joined together with Powerwall Stack Kit hardware. 

Stacking Larger Powerwall Systems

For stacked systems with more than 3 Powerwalls, separate stacks of 3 units should be installed, with each stack attached to a wall. 

Powerwall whole home backup


Designing for Essential Load Backup

If your electrical situation doesn’t allow for whole home backup, Tesla can design your system for essential load backup. This allows you to back up essential loads such as lights and outlets and leave out larger equipment like air conditioners. While the grid is operational, all appliances will be useable, but when the grid goes down only the loads you deem as essential will be operational. Since these systems require less power, a single Powerwall will typically be enough. 

A single Powerwall provides 5kW (13.5 kWh) of continuous power. You can back up any number of appliances, so long as their combined power usage does not exceed the total 5kW of continuous power per Powerwall. To learn more about typical power consumption of different appliances, click here

essential load backup

Your Powerwall Installation Site

Powerwall and Backup Gateway can be installed indoors or outdoors, and can operate within a wide range of temperatures, from -4°F to 122°F. At the extremes of the temperature range, Powerwall may limit charge or discharge power to improve battery lifespan.

To optimise Powerwall performance, avoid installing Powerwall in locations exposed to direct sunlight or subject to sustained extreme temperatures. Additionally, while humidity and rain do not pose a risk, Powerwall should not be installed in locations subject to flooding or near water sources such as downspouts, faucets or sprinkler systems. In order to maintain proper ventilation, Powerwall should be kept clear of debris such as leaves and dense brush, and areas of accumulated snow.