Home Battery Installation in Melbourne’s West

The number on the box is not the number you get. Advertised or nameplate capacity is the total energy in the cells. Usable capacity is what the battery management system will let you take out, and it is always lower, because discharging cells fully shortens their life dramatically.

On top of that, there are round-trip losses. Energy going in through the inverter and back out again does not arrive in full. So a battery advertised at a given capacity delivers less than that in stored energy, and less again by the time it reaches your power points.

This matters because the federal rebate is calculated on usable kWh, not nameplate. It also matters when comparing quotes. Two batteries advertised at the same number can have meaningfully different usable capacity, so the comparison you want is usable kWh per dollar, plus warranty terms measured in cycles or throughput rather than years alone.

The federal Cheaper Home Batteries Program has been running since July 2025. It pays roughly $250 per usable kWh, which works out to about 30 percent off a typical installation, or around $2,500 on a 10kWh battery. The discount tapers above 14kWh, so very large systems do not scale the benefit proportionally.

In practice that puts a 10kWh battery at $8,000 to $12,000 installed before rebates and $5,500 to $9,500 after. Like STCs, the discount is handled at point of sale rather than claimed back later, and the system must be installed by an accredited installer to qualify.

The taper above 14kWh is worth planning around. If you are considering a large system, the marginal cost of the capacity above 14kWh is significantly higher than the capacity below it, which changes where the sensible stopping point sits for most households.

Most people assume a battery keeps the house running in a blackout. Some do, some do not, and the difference is a wiring decision made at install time, not a feature you can enable later from an app.

Standard grid-connected batteries without backup shut down during an outage. This is a safety requirement, not a fault, because feeding power into a dead network endangers line workers. To keep running you need a backup-capable battery plus a backup gateway or changeover device, which adds cost.

Even then, backup is usually configured to run essential circuits rather than the whole house. That typically means the fridge, some lights, internet and a few power points. Running ducted air conditioning or an oven off backup requires much more capacity and inverter output than most home batteries provide.

A Virtual Power Plant lets a retailer or aggregator discharge your battery into the grid at times of high demand, in exchange for payments, credits or an upfront discount. On paper it improves the return. In practice you are handing over partial control of an asset you paid for.

Before joining, read the specifics. How many discharge events per year, and can you opt out of individual ones. What state of charge is reserved for you, which determines whether you still have backup during an event. How long is the contract, what happens if you switch retailers, and does participation affect your battery warranty.

We install VPP-capable equipment and configure it for whichever program you choose, but we do not push you into one. For some households the payments are worth it. For others, particularly those who bought the battery mainly for blackout protection, the trade-off is not.

Here is the arithmetic without decoration. Your saving per cycle is roughly the peak import rate you avoid, 30 to 45 cents, minus the export rate you gave up, under 5 cents, multiplied by the usable kWh you actually cycle. A battery that only cycles half its capacity most days saves half as much as the brochure suggests.

On current pricing and current tariffs, payback lands at 7 to 10 years for most households, against an expected life of 10 to 15 years. That is a real return, but it is not spectacular, and it depends on you having enough evening load to empty the battery most days.

The households where batteries do best have solar already, meaningful evening consumption, and either an EV or electric heating and hot water. The households where they do worst are low consumers who bought capacity they cannot cycle. We would rather tell you that before the invoice than after.

We install Tesla, BYD and Alpha ESS batteries. Selection depends on whether you need backup, whether you are retrofitting to an existing inverter or replacing it, available wall or floor space, and how the manufacturer warranty is written.

Battery systems must be installed by an accredited installer to qualify for the rebate, grid-connected inverters must comply with AS/NZS 4777.2, and all associated wiring follows AS/NZS 3000 with a Certificate of Electrical Safety issued at completion. Location matters too: batteries have clearance, fire separation and temperature requirements that rule out some garages and internal walls.