Should I get a Tesla Powerwall?

What sized battery do I need?

Our solar experts assessed over 20 solar batteries available in Australia and analysed the energy use of around 1500 of our electricity customers. They found that bigger is not necessarily better for the majority of solar homes (although big is usually more expensive).

Most people can maximise their solar energy use with a smaller battery than a Tesla Powerwall. 

The goal is to get a battery that you can use all year round. To work out the right size for you, simply look at your solar export in winter. 


Work out what size is right for you

  1. Grab a power bill from June or July.
  2. Look at the section that says ‘solar exports’ or ‘feed-in value’ in kWh (this is often located on the back of your bill).
  3. Divide that number by the number of days in the billing period. This will give you your average solar export per day.


If you export around 2-5kWh per day in winter…

We recommend the standard DC Sunny Saver battery package that includes the 4.8kWh Sungrow battery.


If you export 5-10kWh per day in winter…

We recommend adding one battery to the DC Sunny Saver battery package, to bring your total storage capacity up to 9.6kWh.


If you export over 10kWh per day in winter…

We recommend adding two batteries to the DC Sunny Saver battery package, to bring your storage capacity up to 14.4kWh.


Try not to go too big, too soon

If you follow this guidance, you should have a really well-sized battery for your home that you can utilise properly all year round. The risk you run if you get a battery that’s too big is that you may not be able to fill it up in winter, because your solar system will generate less electricity at that time of year. 


Have more questions?

Or, have a look through our DC Sunny Saver help section.

Limited time only, while stocks last

Just a $250 deposit today and you’ll secure your DC Sunny Saver.