Tesla PowerWall Certified Installer
Tesla PowerWall Certified Installer
Tesla Powerwall Certified Installer

About Battery Storage

When Does It Make Sense To Install A Battery

Who doesn’t want a nil bill? Households want to be more self-sufficient and less reliant on the grid by storing clean energy generated by their solar panels.

At the moment, the greatest shortcoming of solar power is that you need to use your solar energy at the time that it’s produced to get the greatest benefit. Not everybody can take full advantage of their solar panels’ output. For example, a typical working family which has higher usage early in the morning and in the late afternoon/evening, as the graph demonstrates.

Daily Household Power Production and Consumption with Solar Panels

This is where battery storage comes in.

There are 3 main reasons you’ll want to add batteries to a grid-connected solar power system:

  1. you want to store the excess energy that your solar power system generates during the day and then use this at night when your panels aren’t working.
  2. you want to have backup power available if the grid goes down (mostly applicable in regional areas).
  3. you’re tired of electricity tariff increases and want to cut the cord to the grid and never pay an electricity bill again.

If you’re unsure of the critical questions to ask when it comes to choosing and installing a battery, here’s our Battery Storage Buying Guide with the Top Ten Questions You Need To Ask.

How to Get the Best Return On Investment With a Battery

If you like the idea of installing a battery but you don’t want it to take 10 years to pay for itself, you might want to consider joining a VPP (Virtual Power Plant). This hastens the payback of a battery by between 3-4 years.

With a VPP, you become part of a network of households with solar and batteries, where you run your solar and battery storage system in conjunction with specialised software.

In times of peak demand (eg. on really hot days when everyone’s cranking up their air-conditioners), your energy retailer can tap into your stored power and send this to the grid. Not only do you get handsomely compensated for this power on these occasions, you also get paid a 25c/kWh Solar Feed-In Tariff the rest of the time. Here’s how it works. You:

  1. generate/consume your own solar energy (free)
  2. store your free surplus energy in a battery. This enables you to potentially power your home free from the sun 24/7.
  3. install specialised cloud-based software, which is connected to your inverter. This turns your solar and battery storage system into a smart energy trader. ie. you can generate an income from your system.
  4. get paid a Premium Solar Feed-In Tariff (25c/kWh) once your battery is fully charged
  5. can trade your stored power in times of high demand (sell your stored energy back to the grid, timed at the perfect moment to make the most income for you).
  6. share profits on trades with your energy provider
  7. get a guaranteed discount on your usage charges when you pay on time

All this helps you achieve a faster ROI on solar and storage. Best of all, there are no application fees, lock-in contracts or exit fees.

Under a VPP arrangement, with solar and a battery, you’ll reduce your energy costs massively (you can either request that your credits go towards your gas bill if you have gas with the same energy provider … or for the credit to go straight into your nominated bank account).

A simple app allows you to monitor and manage your home’s energy usage. You can check this 24/7.A number of inverters and batteries are compatible with the VPP, including 2 of our favourites: SolarEdge DC Optimised inverter technology and LG Chem batteries.

Click here for more info or get in touch today to learn more.

How Does Battery Storage Work

Here’s an example of how a system with SolarEdge battery storage technology works.

We only bought 0.7kW from the grid.
Gotta be happy with that.

Graeme Cox
Batemans Bay

Tesla Powerwall customer

Here’s how a solar system with Tesla Powerwall works:

  • your solar panels convert sunlight to DC electricity (Direct Current).
  • any surplus DC electricity that your home doesn’t use charges Tesla Powerwall.
  • the inverter converts the DC electricity to AC (Alternating Current) for use in the home.
  • a special type of inverter also converts AC to DC to charge PowerWall.
Tesla Powerwall
Tesla Powerwall

With batteries, both your daytime and evening electricity usage is free because:

  • any appliances that run during the day can run at zero cost direct from your solar panels; and
  • appliances that run of an evening can also run for free, drawing the solar energy that’s stored in your battery

Can I Disconnect From the Grid When I Install a Battery?

Although we all like the idea of disconnecting from the grid altogether, for most households, it’s advisable to stay connected. This is because the cost of a hybrid system (where you have solar panels + battery storage + the grid as your backup) is so much cheaper than an off-grid system.

The cost of a typical off-grid or stand-alone system starts at about $45,000 for 16-17kWh of usable storage. If you’d like us to design an off-grid system for you, our accredited designers can do this for you. Just complete this Load Assessment Worksheet as thoroughly as you can and email it across to us.

How Much Do Battery Storage Systems Cost?

Size Brand Price
6.5kWh battery LG Chem $10,900
10kWh battery LG Chem $12,250
13.5kWh battery Tesla Powerwall $13,550


  • Reduce electricity bills

  • Get paid for excess power to the grid

  • Protection from black-outs

  • Lessen your household’s carbon footprint

Reposit Power

You can hasten the payback period of your battery by installing a clever Australian-made technology called Reposit Power.

It’s a simple-to-use energy trading system that allows you to charge your battery for free or at cheap rates and on-sell your power to the grid for a profit at peak times.

It’s like a smart meter that works for you.

Battery size 6.5 kWh
Brand LG Chem
Price $10,900
Battery size 10kWh
Brand LG Chem
Price $12,250
Battery size 13.5kWh
Brand Tesla Powerwall
Price $13,550

You can hasten the payback period of your battery by installing a clever Australian-made technology called Reposit Power. It’s a simple-to-use energy trading system that allows you to charge your battery for free or at cheap rates and on-sell your power to the grid for a profit at peak times. It’s like a smart meter that works for you.

Different Types of Batteries

Hybrid vs Off-Grid?

With a hybrid battery solution, you remain connected to the grid. You use your solar panels during the day, draw down from your battery system overnight and have the grid as your backup if your panels and batteries don’t provides sufficient power to cover your consumption. 95% of customers in metropolitan areas will opt for this solution because hybrid systems are so much cheaper than off-grid systems.

As the name suggests, with off-grid systems, you are not connected to the grid. You use your solar panels during the day, draw down on your (larger) battery system when required and usually have a diesel or petrol generator as your backup.

You can choose to go completely off–grid (usually a minimum of $45,000), but this is generally only advisable if:

  • you’re building a new home in a regional area and it’s going to cost you as much or more to install the poles and wires to your home as it is to install an off-grid system
  • you get regular blackouts and/or brownouts
  • you want to be 100% self-sufficient as far as your energy needs are concerned

Battery Storage Capacity and Savings

How Much Energy Can a Battery Store?

This depends on the brand of batteries that you buy, but most household battery storage units are capable of storing between 3.2kWh and 14kWh.

When you use up the storage capacity of your batteries of an evening, you simply draw any remaining power from the grid.

What Size Battery Do I Need?

For households that can run heavy-duty appliances during the day, 6.5-10kWh of battery storage is ample for evening/overnight use. If you aren’t able to use much of your power during daylight hours, you might opt for a larger battery (a min. 14kWh battery would be advisable).

If you’re not sure how much of your overall consumption is during the day, you can work it out by taking a note of your meter reading in the morning (eg. 8am) and again late in the afternoon (eg. 5pm) for a number of days. This will tell you how much energy you’re consuming during daylight hours vs overnight.

Battery Storage Savings

  • You can reduce your reliance on the grid by 80-100% with a solar + hybrid battery system.
  • You can reduce your reliance on the grid by 100% with a solar + off-grid battery system (+ a generator).

To provide you with an accurate solution, we highly recommend a Free Home Assessment.

What Our Residential Customers Are Saying

Tesla Battery Storage Installation - Berry

Battery working superbly, fills to 100% on a sunny morning and still running on solar when we went to bed.

Exactly what we wanted, highly impressed.

Andrejs Medenis, Berry
Solar Panel and Battery Installation - Batemans Bay

The solar and battery are working great. We only bought 0.7kW from the grid. Gotta be happy with that.

Graeme Cox, Batemans Bay
Solar Panel Installation - Thirroul

We are very happy with the solar PV – no technical problems and much lower bills.

Stephen Young, Thirroul
LG/Enphase/Tesla Solar Panel System - Cranebrook

I am extremely happy with my LG/Enphase/Tesla Powerwall 2 system.

It’s performing better than expected and is meeting all of my needs.

Paul Tomkins, Cranebrook
Christine&Barry Rowell-Miller Solar

Look at our level of self-sufficiency! We’re so pleased we followed your advice and bought high quality products.

The LG panels, SMA inverter and Tesla Powerwall 2 are serving us very well!

Christine & Barry Rowell-Miller, Bundanoon
Solar System Installation - Coledale

I am so happy with what was ultimately delivered I’m going to have The Energy Experts install another system for us at a second property.

Caro was in regular contact with me making sure that the entire process went 100% according to plan.

Chris Russell, Coledale
Solar Battery Storage

We’ve already started to see savings. Our last quarterly bill was a third less than this time last year and that’s a winter bill with the worst solar generation conditions.

Thanks for helping us save. I feel we made the right decision following your recommendation and buying high-quality equipment.

Gordon Anderson
Solar Panel and Battery Installaltion - Mangerton

The Energy Experts only recommends good quality equipment and installers and we are very happy with our installation.

Andrew Conacher, Mangerton
More Testimonials

Important Considerations and Battery Storage Quotes

Who Should I Choose To Install My System?

More important than the quality of the components you choose is the quality of the installation, as batteries – especially lithium-ion – are highly combustible. It’s imperative to have your battery system installed by a professional who’s highly experienced and accredited (who’s been installing battery storage systems for at least 3 years).

Tesla PowerWall Certified Installer
Solar Edge Certified Installer

Battery Storage Quotes

The Energy Experts takes the hard work out of installing a battery storage system. Our consultative approach means we understand your current and future needs and properly size and professionally install a high-quality battery storage system that’s guaranteed to outperform and outlast conventional equipment.

Although our home base is in the Illawarra, we have reputable and experienced battery installation teams in the Illawarra, Southern Highlands, Shoalhaven, NSW South Coast, Sutherland Shire and Greater Sydney.

Caro and Wes- Directors - TheEnergyExperts.com.au

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