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Tesla Solar Battery Review

A Revolutionary Battery For Home and Business

Powerwall 2 is designed to store any excess solar energy your PV system produces. This allows owners to power their home or business with free solar energy during the day or night, and can provide seamless and reliable power in the event of a blackout. 

Powerwall 2 also requires no maintenance and comes with a 10-year warranty.

The Tesla Powerwall 2 will also be able to be used for:

How is Powerwall 2 Different?

Powerwall 2 offers 13.5kWh of usable capacity, and comes with an in-built inverter. This allows Powerwall 2 to convert DC power to AC power internally, getting rid of the need for an extra hybrid inverter. This will result in lower installation costs and a much easier installation process.  

Safety and battery life is maximised thanks to the liquid thermal controls and touch safety technology. 

Users can seamlessly monitor and automatically manage your Powerwall, solar panels, Model S or X with the Tesla App.

With over-the-air software updates, Powerwall 2 will continue to improve and adapt to your lifestyle.


Tesla Powerwall 2

TechnologyWall mounted, rechargeable lithium ion battery with liquid thermal control
Warranty10 years
Power7kW peak / 5kW continuous
Usable capacity13.5kWh
Supported applicationsSolar self-consumption
Time of use load shifting
Off grid
ScalableUp to 9 Powerwalls
Operating temperature-20°C to 50°C
EnclosureFloor or wall mounted
Indoor or outdoor
InstallationRequires installation by a trained electrician
Weight264.4lbs / 110kg
Dimensions1150 mm x 755 mm x 155 mm

Powerwall FAQs – General

Tesla Powerwall 2 is a cutting edge lithium ion battery system that allows you to store excess solar energy during the day and use it at night.  Ideal for residential and light commercial use, Powerwall 2 provides backup power in the event of a blackout, and can help you to achieve a more independent energy lifestyle.

Lithium ion batteries, liquid thermal control system, a DC/DC converter, and a battery management system.

Powerwall 2 measures 1150 mm (L) x 755 mm (W) x 155 mm (H), and weighs approximately 125kg.

The only parts of Powerwall 2 that produce noise are its pump and a small fan, which makes up part of Powerwall’s cooling system. At just <50Db, it’s comparative to bird calls or a quiet conversation.

Powerwalls are built in in Nevada, USA at the Tesla Gigafactory.

Your savings will depend on a number of factors including your location and electricity rate. For more specific details, talk to an installer!

Yes, a battery inverter (SMA, Fronius or SolarEdge) to convert DC power (provided by Powerwall) to AC power (which your appliances run on), as well as general conductors and cables to connect Powerwall to the inverter.

Tesla’s unmatched expertise and knowledge of lithium ion batteries makes Powerwall 2 the safest and highest performing battery on the market.

Easy to set up and install, Powerwall 2 requires no ongoing maintenance or servicing, meaning all you have to do is sit back, relax and start using your excess solar energy! Powerwall 2 offers 13.5kWh of usable capacity, and comes with an in-built inverter.

This allows Powerwall 2 to convert DC power to AC power internally, getting rid of the need for an extra hybrid inverter. This will result in lower installation costs and a much easier installation process.  

Powerwall FAQs – Usage

Not at all! Powerwall can be charged using AC power from the grid or a generator. If you don’t have PV, Powerwall can be used for load shifting or backup power.

Yes, Powerwall 2 is ideal for storing surplus solar energy to use at a later time.

Yes, as long as you’ve paired your Powerwall with a Tesla approved inverter with back up functionality, and have designed your system to be off-grid capable. This includes the installation of additional components in your switchboard.

While Powerwall has the functionality to allow users to operate totally off-grid, it depends entirely on how your individual system is configured. Additional components and costs will apply.

While Powerwall permits this, it will depend on whether your local electricity retailer allows you to export stored energy back to the grid.

Currently, no. However, future Powerwall models will come equipped to support the integration of two or more Powerwalls and two inverters.

The changeover period to Powerwall in the event of a blackout is one second.

Powerwall FAQs – Inverter/Additional hardware

Powerwall is currently compatible with specific inverters manufactured by SMA, SolarEdge and Fronius.

No. To ensure maximum productivity and ease of installation, Powerwall is only compatible with inverters approved by Tesla. Using an inverter that is not approved will void your warranty with Tesla.

Powerwall can be integrated with existing and new PV installations. However, it’s likely you’ll need a battery inverter in addition to your existing solar inverter.

Powerwall FAQs – Installation

Powerwall has been designed to be wall mounted on almost all surfaces, as long as the wall can support its weight. It can also be mounted on the floor. 

Installation time depends on a number of factors, including whether or not you’re installing a PV. For more information and an accurate estimate, talk to a solar installer.

Before installing your Powerwall, you’ll need a circuit breaker to be added to your home’s main breaker panel. If you’ve chosen a SolarEdge inverter, an additional backup load panel is required.

Powerwall can be installed both indoors or outdoors, as long as there is at least 300mm of clearance above and below; and 100mm on either side. The garage is the most convenient and popular option.

Powerwall FAQs – Operation & Software Control

Your inverter will communicate with Powerwall 2 to regulate when to charge and discharge. Based on this, Powerwall’s on-board Battery Management System will then control charging/discharging.

You can seamlessly monitor and automatically check the status of your Powerwall, solar panels, Model S or X with the Tesla App. 

For the majority of inverters, elementary control modes such as “Maximize self-consumption of PV”, or “Perform energy arbitrage according to a specified schedule” can be easily programmed.

Yes, approved SMA, SolarEdge & Fronius inverters can be controlled remotely through an easy to use monitoring system.

Yes, this is called ‘over the air updates’ and is achieved by using your inverter’s internet connection.

Powerwall FAQs – Safety and Environmental

Powerwall is completely safe. Thanks to a highly sophisticated Battery Management System and liquid thermal control system, Powerwall’s lithium batteries will always function in a safe manner. In addition, Powerwall has been tested and certified to meet local market safety standards.

Yes. Once a Powerwall has reached the end of its life, Tesla will accept it for recycling back at the Gigafactory.

Under normal operations, Powerall does not pose a fire hazard.

Powerwall FAQs – Maintenance & Reliability

Due to its state of the art design, Powerwall 2 does not require maintenance or servicing.

Your installer and/or Tesla will provide assistance, depending on the nature of the service needed.

Powerwall 2 comes with a 10 year limited warranty, which includes defects in parts and workmanship, as well as at least 60% energy retention after 10 years.

The amount of time Powerwall will keep working for past its 10-year warranty depends on a number of factors, including type of operation and environmental conditions.


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