sonnenFlat South Australian Rebate

sonnenFlat South Australian Solar Battery Rebate

Announced today sonnen, the world’s largest home battery storage manufacturing company will be opening its doors to a battery manufacturing plant in South Australia.

This will be the first plant in Australia to build and manufacture residential and commercial battery storage solutions which is a huge milestone for the Australian battery industry.

This exciting news for consumers in Australia comes following the announcement from the South Australian Government that they will offer $100M in state government subsidies for up to 40,000 households to install battery storage in their homes.

Individual grants of up to $6,000 will be available to help with the purchase of batteries.

Australian made products (sonnenBatteries) and their installers are expected to be prioritised in the rebate.

Natural Solar is the largest solar and battery installer in Australia, and an established partner of sonnen.

As the largest installer of sonnenBatteries nationally, at Natural Solar, we are able to offer our residential, commercial and developer customers the best pricing available in the market due to our purchasing power.

Our competitive home battery storage and solar pricing, coupled with the newly announced rebates will offer an unbelievable return on investment for Australian homeowners, with eligible homeowners to be able to experience high savings and, in some cases $0 electricity bills.


sonnenFlat $0 electricity bills are now here! Enter your details below to get an instant quote!

  • Your Solar Battery Solution

The sonnenBatterie
The sonnenBatterie

Steve Fenech (left) and the Ridey family (right) – happy Natural Solar customers standing proudly in front of their sonnenBatterie which allows them to take part in sonnenFlat.

sonnenFlat Tiers

There are a number of tiers within the sonnenFlat program.

sonnenFlat 8sonnenFlat 10sonnenFlat 12
Minimum Solar System Size (kWp)5.0 kWp7.5 kWp10.0 kWp
sonnenBatterie eco 8 Size (kWh)8kWh10kWh12kWh
Monthly Administration Fee$30$40$50
Annual spend$360$480$600
Annual Consumption Allowance in kWh75001000012500

An Example: The Wilson Family based in Sydney:

The Wilsons annual household consumption is 10,000kWh. The Wilsons currently pay $0.31372/kWh (incl.GST) which leaves them with an electricity bill of $3,472 including daily supply charges.

The solar system of 7.5kWp and the sonnenBatterie eco 8.10 (10kWh, 8th Generation battery) enable them to participate in the sonnenFlat 10 tier which leaves them with a significantly reduced energy bill, as per the calculation below.

sonnenFlat 10
Savings per year installing solar system, sonnenBatterie and credit from sonnenFlat$3,472
sonnenFlat 10 fee per year$480
Net savings per year$2,992
Net savings over 10 Years (assuming prices stay at 2017 levels!)$29,920
sonnenFlat Box Image
sonnenFlat Box – Simply plug this into a socket in your home and prepare to pay $0 for electricity!

Want to be free from electricity bills? Get a quote for a sonnenBatterie Eco 8 with or without a solar system here or below!

The sonnenFlat concept is already in use in Germany, with about 60,000 customers taking advantage of this system.

How does sonnenFlat work?

So what’s the catch? In exchange for sonnen basically paying your electricity bills for you, you give sonnen access to your battery for helping with grid stabilisation services. For example, if there’s lots of power being exported into the grid from solar systems around the area, grid operators (not retailers) can at the click of a button, push some of that excess power into customers partaking in sonnenFlat whose batteries have spare capacity.

Looking at the Germany model for sonnenFlat, it works on a number of tiers, where the owners size of the solar system and the size of their battery energy storage determines the amount of free electricity the owner is entitled to. If a customer exceeds the amount based on their tier, then the owner starts to get charged only for electricity imported from the grid (not from power generated from your solar system and power utilised from your battery) at a rate significantly lower than standard retail electricity rates.

sonnenFlat Packages

Natural Solar is selling packages to enable owners to be eligible for a sonnenFlat Tier and are selling all sizes of the sonnenBatterie, both with and without solar panels. Whatever your needs, we can supply it and install it!

For those who do not already have a solar system, getting it installed at the same time as your battery is both a cost effective and efficient way of getting your system up and running at the lowest cost (bundle pricing, one installation team, etc.).

For those that do already have a solar system, you will get the most out of your system when you are able to take part in the sonnenFlat system, so if you already have an appropriately sized solar system, fantastic! If you don’t, we can add additional solar panels or replace your current panels with much more efficient panels.

sonnen Flat FAQs

The eligibility criteria for sonnenFlat are:

  1. Your solar system must be 5kWp or larger in size.
  2. Your solar battery must be the sonnenBatterie eco 8.8 (8th Generation, at least 8kWh). Earlier models are not compatible with sonnenFlat.
  3. You must be connected to the grid.
  4. You must work with Natural Solar after your installation to register on the sonnen website.

*Contest closes 31st May. Contest only open to customers in Sydney, Melbourne, Brisbane or Adelaide metro areas entered with correct details. Winner will be announced via our Facebook page on 31st May at 12pm AEST. For full terms and conditions, click here.


These costs are based on the SA Power network in Adelaide but prices may vary depending on your circumstances. This comparison assumes a general energy usage of 4000kWh/year for a residential customer on Energy Locals Time of Use Tariff – (TOU – Peak, Off-Peak & Solar Sponge).

The reference price is set by the Australian Energy Regulator (AER) for a financial year in relation to electricity supply to residential customers in the distribution region and is based on an assumed annual usage amount. Any difference between the reference price and the unconditional price of a plan is expressed as a percentage more or less than the reference price. The terms of any conditional discounts are shown, along with any further difference between the reference price and the discount applied if a condition is met, expressed as a percentage more or less than the reference price.