sonnenFlat is the ideal addition to your sonnenBatterie and solar system.

sonnenFlat will enable you to become independent from conventional retailers and take your energy future into your own hands.


Register your details below.

What is sonnenFlat?

It is an energy tariff for sonnenBatterie owners. You receive a guaranteed annual allowance of energy for a low monthly fee and in return some of the energy stored in your sonnenBatterie will be used to assist in the stabilisation of the electricity grid resulting in reducing your energy bills.


How does sonnenFlat work?

  • The offer is open to customers who purchase and install the sonnenBatterie and who have an existing or new solar system.

  • Once you have purchased and installed your sonnenBatterie with one of our partners, you can sign up for one of three sonnenFlat packages outlined below.

  • Your solar and sonnenBatterie system will cover a large portion of your energy consumption but not all. Therefore under a conventional retail bill you will still have energy charges and fixed supply charges to pay.

  • sonnenFlat replaces both these charges with one low monthly fee, saving you money on electricity bills.

  • Each package requires a suitable capacity solar system installed on the roof of your home.

  • The solar system, the sonnenBatterie and sonnenFlat will combine to provide your energy needs to the consumption allowance.

  • If you exceed the allowance in a 12 month period you will be charged ONLY for the excess consumption taken by the grid at a low competitive per kWh energy rate.


Who can participate in sonnenFlat?

  • sonnenBatterie owners with an existing or new solar system

  • Houses must be connected to the National Electricity Market. Unfortunately sonnenFlat cannot be offered in Western Australia or houses connected to the Ergon Network in Queensland.

  • Victoria & Tasmania available soon.

What advantages do I receive with sonnenFlat?

  • An energy package to make the most of your solar system and sonnenBatterie

  • Energy cost savings above that provided by solar and storage system

  • A mechanism to control your energy cost against rising energy prices

  • sonnenFlat improves payback time of the sonnenBatterie

What do I need?

  • A suitable solar system – minimum 5.0kW or above

  • sonnenBatterie eco 8.8 or above

  • Successful registration completed below & qualified

What else do I need to know?

  • Delivery of sonnenFlat starts shortly after the successful installation of the sonnenBatterie and solar system listed below (actual start date will depend on you transferring from your existing retailer to sonnen)

  • sonnenFlat fees start from $30+GST/month with an ongoing contract and the ability for you to opt out at any time without an exit fee

  • You provide a little amount of the energy stored in your sonnenBatterie to help stabilise the grid without affecting your household consumption

  • Pricing for the requisite sonnenBatterie and solar systems will differ based on capacity and Partner dealer installation cost. Partner dealers can quote you on detailed pricing for both solar system and sonnenBatterie



sonnenFlat Packages

There are three energy packages which you can choose from to suit your energy needs.

¹ South Australia and NSW - Essential Energy Network customers will have an extra $12+GST above the standard monthly fee. ² Consumption from the grid in excess of annual energy allowance will be charged at competitive per kWh rate. Package Prices exclude GST.




A sonnenFlat team member will be in touch within the week to confirm your eligibility.
Please save the email to ensure you don't miss our email potentially filtered to your junk box.

Have more questions? Please call us on 1800 CB Solar