Solar Battery

Tesla Powerwall 2 vs Sonnen Battery

Looking for a reliable solar energy storage system? It can be hard to choose between two leading and best-performing solar batteries in the industry:

  1. Tesla Powerwall
  2. Sonnen Battery

Here is a comprehensive review of Tesla Powerwall 2 and Sonnen Battery that will help you make an informed decision between the two.

Key Parameters That Help Differentiate the Two

Battery Size

The Tesla Powerwall 2 battery comes in only one size, i.e. 13.5 kWh of energy storage. This is ideal for most large-sized and modern homes in Australia.

On the other hand, the Sonnen Eco product range starts from 4 kWh and runs up to 16 kWh with 2 kWh increments. From this, it is clear that Sonnen offers greater flexibility in terms of battery size.

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Battery Cell

When we talk about Tesla Powerwall 2 review vs. Sonnen Battery review, another key differentiator between the two is the battery cell. Both Tesla Powerwall 2 and Sonnen batteries have different cell chemistries.

Lithium Nickel Manganese Cobalt Oxide (NMC) is used in Tesla Powerwall 2, while Lithium Iron Phosphate (LFP) is used in Sonnen batteries. Both have their own pros and cons. However, Lithium Iron Phosphate (LFP) batteries are extremely safe due to the absence of cobalt. In addition, they have an extremely long lifespan.

Battery Warranty

The Tesla Powerwall 2 and Sonnen battery review cannot be complete without comparing the warranty aspect. Talking about the battery warranty, the Sonnen battery holds the upper hand compared to the Tesla Powerwall 2. The Sonnen Eco battery comes with a warranty of 10 years. However, it also covers 10,000 cycles of charging and discharging with an estimated 80% retained capacity for 10 years.

On the other hand, the Tesla Powerwall 2 offers a warranty to be ‘free of defects’ and unlimited cycles for 10 years. However, the unlimited cycles do not cover the normal degradation of the Tesla Powerwall 2 over time.

Power Output

For choosing the best solar battery storage in Sydney, considering the power output is crucial. The Tesla Powerwall 2 can produce up to 5 kW continuous power, which is above average for solar batteries.

On the other hand, Sonnen Eco has a power rating of between 3-8 kW.


Both Tesla Powerwall 2 and Sonnen Eco have been engineered by trusted countries with expertise and experience. The Tesla Powerwall 2 has been built in the United States of America. Although relatively new in the market, the build quality of the Tesla Powerwall 2 is top-notch.

The Sonnen solar battery is manufactured in Australia, while it is engineered in Germany.


With this Tesla Powerwall 2 review vs. Sonnen battery review, you can get a clearer picture of which solar battery storage is better for you. The battle between the two is a difficult one. Tesla is making rapid developments, while Sonnen is also continuously improving the functionality and storage options of its batteries. You can take the help of an installer to choose the right solar battery storage in Sydney.

Isolux is a leading installer of solar systems with batteries in Sydney. Get a free quote today!

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