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Review: Tesla Powerwall 2

This is the home battery you’ve been waiting for.

In a nutshell, the Tesla Powerwall 2 is double the home battery system that the original Powerwall is, in a smaller and more robust package. Due for Australian release in February 2017 at approximately the same $8,000 per unit price tag as the original, it represents a major leap forward. In particular, the introduction of built-in DC/AC inverter will make retrofitting a lot easier and deliver that much more simplicity and efficiency.

Double the power, or half the cost?

The extra power and capacity mean it’s able to serve as a single, affordable home battery system, a feat that largely eluded the first model. According to the Tesla website, a single Powerwall 2 is enough to power the average two-bedroom home for an entire day. Previously you would have needed two home battery systems, at double the cost, to get the same result.

Great strides have also been taken in usability. The first Powerwall could only be wall mounted and was for indoor use only, while the Powerwall 2 can be mounted on both the floor and the wall, inside or outside. The extra power and the extra versatility, combined with the significantly smaller dimensions, mean a lot more homes will be able to use the Powerwall 2.

Australia in particular has relatively high energy costs. With the right home solar panel installation, the Tesla Powerwall 2 might finally be the technology that allows people to move off the grid.

Specifications

SpecsPowerwallPowerwall 2
Storage capacity6.4 kWh13.2 kWh
Power (continuous)3.3 kW5 kW
Power (peak)3.3 kW7 kW
Current pricen/aApproximately $8,000 per unit
MountingWallWall or floor
Round trip efficiencyApproximately 90%Approximately 90%
Weight95kg122kg
Dimensions1,300mm x 860mm x 180mm1,150mm x 755mm x 155mm

How much can I save with the Tesla Powerwall 2?

The typical Australian household consumes about 21 kilowatt-hours (kWh) per day. Depending on your power usage and your installed solar system, the Tesla Powerwall 2 could help you save well over $1,000 a year. When combined with Tesla’s 10-year manufacturer’s warranty, there’s a reasonable chance that the Powerwall 2 could be the missing puzzle piece that will allow home solar systems to go well beyond breaking even and start delivering real solar savings.

If you’ve been waiting for the right technology, it might finally be here.

Andrew Munro

Andrew writes for finder.com, comparing products, writing guides and looking for new ways to help people make smart decisions. He's a fan of insurance, business news and cryptocurrency.

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