Fronius Solar Battery vs Tesla Powerwall 2 | Infinite Energy

Fronius Solar Battery vs Tesla Powerwall 2

Fronius Solar Battery vs Tesla Powerwall 2

Written by Infinite Energy

Fronius Battery vs Powerwall 2


Fronius and Tesla are manufacturers of the some of the best solar batteries on the market.

In this blog, we’ll be looking at the differences between Fronius Solar Battery and Tesla Powerwall 2, and the benefits of investing in either product.


About Powerwall 2

Like the first-generation Powerwall, 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 evening.

Compared to its predecessor, Powerwall 2 offers double the energy at 14kWh, and comes with a built-in inverter.


About the Fronius Solar Battery

A high-performance lithium battery, the Fronius Solar Battery allows you to store your excess solar energy during the day, and use it at night. Infinite Energy stocks all six Fronius Solar Batteries sizes, 4.5kWh, 6.0kWh, 7.5kWh, 9.0kWh. 10.5kWh, and 12kWh. 

To make the comparison as even as possible, we will be comparing Powerwall 2 with the 12kWh Fronius Solar Battery.



Both Powerwall 2 and Fronius Solar Batteries utilise lithium-based technology.

Completely safe and reliable, lithium-based batteries offer a number of advantages over other rechargeable cells powered by nickel-cadmium (Ni-Cad) or nickel–metal hydride (NiMH), including high energy density, which means they lose less charge over time; and extremely low maintenance requirements.


Service Life

Fronius Solar Batteries are guaranteed for 8,000 charges at 80% depth of discharge, and can comfortably complete two cycles per day.

Powerwall 2 is guaranteed for 3,650 charges. Designed to complete one charge and discharge per day, Powerwall 2 is warranted for 10 years.



The 12kWh Fronius Solar Battery retails for $20,000, while Powerwall 2 is expected to cost $9,450 plus GST.



Fronius Solar Batteries come with a 2-year warranty, that can be extended free of charge to 7 years when registered online.

Powerwall 2 comes with a 10-year warranty.


Compatible Inverters

Due to quality control purposes, Fronius Solar Batteries are only compatible with Fronius hybrid inverters.

Due to Fronius only stocking the three phase Symo Hybrid Inverter, Fronius Solar Batteries can currently only be installed in three phase homes. The single phase Primo Hybrid Inverter will be available for single phase homes in 2018.

While Powerwall 2 comes with a built-in battery inverter, you’ll still need to invest in an inverter to convert the DC electricity generated by your solar panels into AC electricity to power your home. Powerwall 2 is compatible with select high-quality inverters from manufacturers like SolarEdge and Fronius.



Both Fronius Solar Batteries and Powerwall 2 can be retrofitted with an existing system.


Technical Specifications

Fronius Solar Battery 12kWh Model
Technology Lithium iron phosphate battery
Warranty 2-year warranty, that can be extended free of charge to 7 years when registered online
Usable capacity 9.6kWh
Efficiency >90%
Power 6.4kW
Cycle life 8,000 at 80% depth of discharge
Voltage 320 - 460V
Current 16A
Compatibility Currently only three phase
Enclosure Indoor installation
Weight 176kg
Dimensions 955 x 570 x 611mm 


Tesla AC Powerwall 2 
Technology Wall mounted, rechargeable lithium ion battery with liquid thermal control
Warranty 10 years
AC Energy 13.2kWh
Efficiency 89% round-trip
Power 7kW peak / 5kW continuous
Cycle life 3,650
Scalable Up to 9 Powerwalls
Depth of discharge 100%
Compatibility Single or three phase
Enclosure Indoor or outdoor installation
Weight 110kg
Dimensions 1150 mm x 755 mm x 155 mm


Infinite Energy is proud to have installed one of the first Fronius Solar Batteries in Perth in 2016, and WA’s first Powerwall in the same year.

Both batteries are examples of advanced solar storage technology, and can bring a wealth of benefits to both homes and small businesses. Which battery is right for you will depend on your usage, budget, phase and other factors, including technical compliance in your state.

For a no obligation quote on solar and battery storage for your home, click here.


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