January 26

Myths and Facts About Solar Batteries in Perth WA


You always need a plan to get the most out of your solar power system.

Firstly, all you can do is to identify the main reason for buying solar batteries for your system. If it’s just to reduce the electricity costs immediately, then maybe it’s not the right time yet.

Research conducted by AEMO reveals that it probably takes a payback period of 6 to 12 years for a standard solar PV battery system producing 5 to 8 kWh. 

It’s also a true fact that some solar batteries are relatively expensive. Nowadays, a hybrid inverter having a corresponding lithium-ion battery costs between $8,000 and $15,000. Primarily, the payback period may exceed the standard duration of a 10-year warranty.

But apart from this, there’s also a piece of good news that the battery prices are constantly dropping.

Solar Terminology and Keywords

Before we get to know the brief about solar batteries, let’s get familiar with some terminology that you will come across while finding all the answers to your queries.  

Kilowatt (kW)

Kilowatt basically refers to a unit that measures the rate of energy transfer i.e, 1 kW = 1000 watts.

If we talk about solar panels, a kW rating states the highest amount of power that the solar panel can actually deliver at a given point in time. Now if we talk about the batteries, it’s considered as the maximum amount of power that the battery can deliver.

Kilowatt-hour (kWh)

Kilowatt-hour can be described as a unit of energy consumed/produced over a period of time i.e, 1kWh  = 1000 Wh.

Let’s take an example, a solar panel that produces 700W in an hour is said to deliver 700Wh or 0.7kWh of energy. But in the case of batteries, it’s described by the total amount of energy the battery can store.

Round-trip Efficiency

Talking about a lithium-ion battery’s round trip efficiency, it depicts the amount of energy a battery can actually store after it reaches the full battery capacity. It ranges from around 80 to 95%.

DC Coupling

DC coupling is a technique that allows the flow of direct current (DC) transfer directly from a solar panel to the battery without inversion. So that if you need AC power, then the electricity will only be inverted once as it flows from your battery to your devices or to a grid.

Myths About Solar Battery Storage

There are several myths about solar batteries. Some of them are:

You Can Earn a Certain Amount of Money From a Feed-in Tariff for Excess Solar Power Produced by Your Solar Panels During the Day

A time back, you could have earned a premium for excess power generated by your solar system. This was usually sent to a virtual power plant, then used to be backed by a friendly feed-in tariff.

Nowadays, those feed-in tariff schemes have either been greatly reduced or discarded. 

For example, Victorian households now get a lower price for their exported power and pay up to 33 cents/kWh for the grid energy usage at peak times. 

Adding Battery Storage to Solar Panels Isn’t Worth For the Investment

The drastic increase in the cost of energy has led to the demand for more solar storage systems in Australia.

Many times your solar output matches your daily needs. In such a case, you can easily go without a battery as you may find that it only just pays for itself by the time it needs the replacement.

The actual differences come when your power is required to peak in the evenings when you’re paying for it from your electricity retailer. Charging an electric car or using other energy-intensive appliances at times when you’re not generating your own power will mean that your bills aren’t significantly reduced without using a solar battery.

So, you can store all the extra energy generated by the solar panels on the battery during the day when your system is working. In that way, you’re assured of all your backup just in case a blackout or power outage occurs. 

You should aim to get the perfect solar and battery storage solution to meet all power consumption needs.

Are Solar Batteries Actually Worth it?

There is no doubt that solar batteries are absolutely worth it even if your energy usage tends to be at night, or if you live in areas where power outages are very common, or if on-grid power is not a viable option. On the other hand, if you use most of your power during the daytime, then it’s currently challenging to explain the expense of a battery while looking at it in purely economical form – you may only have to just pay for it with energy bill savings by the end of your battery’s life.

But obviously, enough batteries will eventually help you to save the planet from global warming by reducing household carbon emissions, which is nothing to be inhaled.

Before choosing a solar battery, you must need to consider several factors like:

Available Rebates and Incentives

The feed-in tariffs have been essentially phased out and are replaced by reflective tariffs. This movement, along with rising electricity costs, has become the main reason behind the mass adoption of battery storage systems. 

The federal and state governments have also come in support of it. Many state governments have their own affirmations toward net-zero carbon emissions by the year 2050 or sooner. The NSW government is steering a scheme “Empowering Homes solar battery loan” that will provide interest-free loans for installing a solar battery for their household. 

With more focus on reducing carbon emissions, the solar incentives are available locally and eventually will go beyond the federal government STC rebate scheme and NSW Government solar incentives and programmers in the future.

Just for an example, let’s just take a look at forward-looking South Australia, where the Adelaide City Council is offering a rebate of $5,000 for homes that opt for solar batteries. This is the aspect of the Sustainable City Incentives Scheme, which often provides:

  • Battery energy storage: $5,000
  • Solar panel: $5,000
  • Charging controllers for electric vehicles: $500
  • Energy efficiency upgrades: $5,000
  • LED light replacement: $1,000


Effects of Battery Storage on the Electricity Costs

Batteries have the potential to allow homeowners to use more electric power. For example, If we add a 4kWh battery to a 5kW solar panel, it can boost generated electricity rate by 30 to 60%.

And as the grid electricity is becoming more expensive, the battery storage prices are also falling. So, you could go off-grid in the years ahead.

Increased Adoption and Plummeting Battery Costs

Between the years 2007 and 2014, the battery costs have dropped by 14%. This sensation will continue owing to the large-scale production by solar companies. 

Accordingly, over 50% of Australian households could actually adopt a $10,000 battery system that has a payback period that matches typically a 10-year warranty. These homes will be able to optimize their generated solar power and also minimize their dependency on the grid.

Solar Battery Storage Price

Solar battery prices in Australia generally range between $4,500 and $18,000. Prices depend on your objectives, residence, and on the factor of whether you need a backup when the grid is down. 

Other factors often include the battery chemistry, size and whether you want to purchase a standalone battery or just have the battery as part of an integrated solar system.

The table given below provides the average solar battery prices in Australia as of August 2021.


Average Battery Size (kWh) Average Battery Price (AUD)* Average Battery Price, including Charger/Inverter (AUD)
3 $4,710 $5,340
6 $6,800 $7,700
8 $9,680 $10,800
10 $10,550 $11,620
13 $13,390 $13,910
18 $17,100 $18,000


The table given below provides a detailed view of approximate installation prices (as of August 2021):


Battery capacity range Installed cost as per kWh capacity Cost per kWh throughout (total life cycle) Cost per kWh throughout (one cycle per day)
1-5 kWh $1,570 $0.35 $0.41
6-10 kWh $1,210 $0.24 $0.27
11-15kWh $1,030 $0.26 $0.31
16-20 kWh $950 $0.22 $0.29
All $1,190 $0.27 $0.32


When Will Be the Right Time to Get a Solar Battery?

It depends on certain terms:

Since the year 2010, the solar industry has witnessed an 80% decrease in the cost of batteries. This may plunge by a further 50% by the year 2025. So, it is estimated that in less than 10 years from now on, battery storage capacity will ultimately increase 50 times.

Owning a home battery system can easily allow you to store the grid power during off-peak periods as well, and then you just have to tap into battery power during peak times, thus this will help in reducing the electricity costs. All this makes perfect sense specifically if you’re not using a lot of energy when the sun is shining in the daytime.

Further, many people will be glad to know that if there is a case of a power outage, their battery will indicate that they have an uninterrupted supply.

And also, you can go completely off-grid at the right time.


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