“sonnenFlat was the final deciding factor when we chose to purchase sonnenBatteries. With sonnenFlat, having a fixed monthly energy bill meant a lot to our household for budgeting and knowing we won’t be stung by exorbitant bills has been a huge benefit for us. We used to pay up to $5,000 each year for a household of five to our energy retailer even with our rooftop solar. Our bills are now $49 per month and nothing has changed about the way we’re being supplied electricity. The only change is we get a fixed monthly energy bill from sonnen.”

Bo Gacic, South Coramandel, South Australia. sonnenBatterie owner and sonnenFlat member.
sonnenFlat Energy Bundle Icon

Now it's your turn to declare your energy independence.

With sonnenFlat Energy Bundle you can also save $1000.

white sonnenBatterie in front of a grey wall

What is sonnenBatterie?

The smartest home battery system in the world. With the sonnenBatterie hybrid you already save the cost for a solar inverter because the solar panels are wired directly into the sonnenBatterie. On average sonnenBatterie enables you to cover 80% of your annual energy requirements.

white sonnenBatterie in the living room, father and son sitting next to the window talking

What is sonnenFlat?

An energy plan that combines with your solar system and sonnenBatterie to offer a cost-effective complete energy solution. Your electricity rates can be fixed as low as $49 a month.

*To sign-up for sonnenFlat you need to have a sonnenBatterie. The sonnenBatterie price is not included into your monthly sonnenFlat rate.

How does sonnenFlat Energy Bundle work?

sonnenFlat Energy Bundle

3 simple steps to get sonnenFlat Energy Bundle:


Press the button at the bottom of the page to receive your unique voucher code.


Reduce and fix your monthly electricity costs, to as low as $49 per month.


Use the voucher within 60 days of issuing, to claim $1,000 off the price  of a new sonnenBatterie (min. 10kWh).

Offer is available in:

NSW, VIC, SA, ACT, TAS & QLD  (Energex region).

If you live in WA or QLD Ergon region - call sonnen on 13SONNEN (137 666) to discuss your options.

And you'll need solar panels too:

•  If you already have solar, make sure it is at least 5kWp.

•  If you don’t have solar, just get it with your sonnenBatterie.