Sonnen solar batteries reviews

Based on 29 ratings Aus Ranking

  • 5 star 27
  • 4 star 2
  • 3 star 0
  • 2 star 0
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About Sonnen, Solar Batteries

Sonnen solar batteries review

Sonnen is a German brand that has attracted quite a bit of attention in Australia, partly due to manufacturing (well, assembling) batteries here - in South Australia (at one point - not currently).

Founded in 2010, Sonnen GmBH was one of the first suppliers of lithium ion solar batteries for home use in Germany.

About sonnenBatterie Evo

Unveiled in early December 2021, the sonnen Evo battery offers 10 kilowatt-hours of usable storage and 5 kilowatts continuous power. Aside from a power boost compared to sonnen's previous home battery, other improvements include the Evo can be installed outdoors and has built-in backup capabilities. To be available in early 2022, you can learn more about sonnen's new home energy storage product in our sonnenBatterie Evo review.

About sonnenBatterie Eco

Sonnen's flagship product prior to the Evo was sonnenBatterie Eco (yes, the weird caps situation is annoying), which translated simply means 'sun battery' - clever, huh? For some reason, things always sound cooler in German.

The sonnenBatterie Eco is an all-in-one unit - sort of. It includes AC battery inverter built-in but requires a solar inverter. The unit can be AC coupled or DC Coupled with 3-phase hybrid variant.

Various capacities are available, for example the 9.43 - which  actually has 15kWh nominal capacity, 13.5kWh of which is usable (same as Powerwall 2). The 9.43 has pretty low power output capabilities, a maximum 3.3kW.

You can view more specifications on our battery comparison table.


Sonnen battery owners in NSW, QLD (Energex region), SA, ACT, TAS and VIC have the option of joining sonnenFlat, which enables them to receive a guaranteed annual allowance of electricity from the mains grid for a fixed monthly fee, with supply charge included.

Pricey Batteries, But Okay

At the prices Sonnen charges, its batteries (like many others) currently won’t pay for themselves under realistic conditions within the warranty period (10 years or 10,000 cycles, whichever comes first) if purchased directly from the company.

Cheaper prices can be had from the company's partners; but you'll still need to crunch the numbers to determine if a Sonnen battery is right for you financially-speaking. 

A significant reduction in cost would certainly help Sonnen achieve its stated vision of a "world in which everyone is able to cover their energy needs with decentralised and clean energy sources".

Another disadvantage, depending on your situation, is the sonnenBatterie Eco is indoor-rated only - it can't be installed outside, but the arrival of the Evo solves that. Other than that, we haven't found much to complain about, except for some of Sonnen's claims from time to time that we've found to have been a little optimistic.

The products are good and the company seems stable - so if you're happy to fork out the extra cash and are aware of its limitations, a Sonnen battery could be a suitable energy storage solution in your situation.

If you're an Australian Sonnen owner, your opinion of your system would be valued by other visitors this page - please leave your rating and review.

Sonnen Solar Battery Reviews

Bought From: Penrith Solar Centre Show additional information
Bought From: Positive Energy Solutions Pty Ltd Show additional information
Sonnen Battery looks great. Was neatly installed. Love the app, it fills by 12 noon most days. Highly recommend paying more for a quality product like Sonnen.
Bought From: Sapphire Solar
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Bought From: Solar Wholesalers SA Show additional information
Compact and modular in design. Very quiet operation and has a fantastic monitoring app.
Bought From: Solar Wholesalers SA
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Reliable solid performer

Got the 9.43 Eco 7.5kwh unit in Dec 2018 after having a 3.8kw micro inverter array installed in Dec 2014.
Started benefiting from using our own power during the day in spring/summer months & with some left to use at nights.
Recently installed 3 more panels taking us to 5kw array - immediately noticed more battery uptake.
Plan to increase battery to max 15kwh module very soon, now we can fill it more easily - should give us more of our own power left to use on hot summer nights.
Very happy with this Battery which has performed flawlessly since installation.
Prior to our Battery, we were selling most of our power to the provider for 7c/kwh & buying it back from them when we were home at night for 27c/kwh !
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Bought From: Solar Wholesalers SA Show additional information
New Meter now installed, seems to work to my expectations.
Love the app, can easily track remotely
Sonnen monitoring made contact when battery offline
Bought From: Kozco Energy Group
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We're proud to support Sonnen, being quality German technology, & made in South Australia, supporting local jobs.
Bought From: Solar Wholesalers
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It us a Sonnen 15 kw. I would like a larger capacity battery but 15KW is all they have. The technology is Lithium Ferrous Phosphate and it was installed a few years ago by Mo at Green Solar Energy. Working well.
Bought From: Green Solar Energy NSW
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Great solar feed in options via Sonnen
Bought From: Smart Energy Answers Sydney O
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Bought From: Enervest Show additional information

near 3 years on

We originally installed a 10 kW-Hr system in Aug 2018, and expanded to 14 kW-Hr in Aug 2020. The system has worked well for 2.5 years, and apart from a glitch when Sonnen upgraded the firmware, it has been very reliable

The monitoring app provides all the detail we need on power generated, used to charge the battery, exported to grit, consumed locally.

We also participate in the SonnenConnect VPP, which more than pays for itself. Overall, with the generated power, battery usage and VPP fee we receive, our overall power bill is around $0 per year (down from $4500 per year prior to solar)

The only downside is that it does not provide backup during grid outages, which thankfully are not a common event
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The battery has run flawlessly since install 3 years ago. The app is easy to navigate to enable constant monitoring whenever wanted.
Bought From: Natural Solar
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Bought From: Apex Energy Australia Show additional information
Bought From: Samar Tech Show additional information
Bought From: Sapphire Solar Show additional information
Bought From: Adam Solar Show additional information
The Sonnen Battery Unit has the inverter & all the smarts built in so we know exactly where we are with the system via their management app, work nicely & just don’t have to worry about it, typical German Engineering solid & reliable ????
Bought From: RK Solar And Consulting NSW
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Too soon to comment on reliability or backup capability.
Bought From: RK Solar And Consulting NSW
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Great service. Offers an app to see how much power has been used, which is one of my favourite features.
Bought From: Natural Solar
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So far we are very happy with the Battery. It is wonderful seeing the amount of the day we are running under our own power and not purchasing from the grid. Looking forward to seeing the savings add up over the months and years ahead.
Bought From: DQ Electrical Pty Ltd
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With our time constraint, there wasn't much of a choice in the type of battery. We were also applying for a Government subsidy. I had previously attended a Sonnen information session and thought the Sonnen was up to speed but still think about the Tesla and think about whether or not it would make a difference in performance and cost.
Bought From: NRG Solar - National Renewable Group
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Bought From: Perfect Solar Power Show additional information
Bought From: Natural Solar Show additional information
Bought From: SAE Group QLD Show additional information
The app is a bit crappy.
Bought From: Natural Solar
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Quiet, it does its job. Performs well, during the night, the battery powers our home quite adequately. No more depending on the domestic mains for nightime power.
That in itself, is a bonus !
Bought From: Green Solar Energy NSW
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Bought From: Natural Solar Show additional information
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