Federal home battery rebate calculator and Victoria guide.

Which battery incentive is current in Victoria?

The main current battery installation incentive for eligible Victorian homes is the Australian Government's Cheaper Home Batteries Program. It operates through small-scale technology certificates (STCs) under the federal Small-scale Renewable Energy Scheme.

Solar Victoria is no longer accepting applications for its former interest-free battery loan. That closed Victorian battery program should not be confused with the current federal STC discount.

In practice, the federal benefit is commonly reflected as an upfront reduction when the customer assigns the right to create the battery's STCs. It is not a fixed Victorian cash rebate and the dollar value of an STC is not fixed.

What battery sizes are eligible?

Under the current federal rules, an eligible battery system can have a nominal capacity from 5 kWh to 100 kWh. The scheme calculates battery STCs on no more than the first 50 kWh of usable capacity.

Nominal and usable capacity are different. Nominal capacity describes the battery system's total stated storage capacity; usable capacity is the amount available for discharge under the product's operating limits. The current certificate calculation uses usable capacity.

The battery must also satisfy the program's current product, accredited-installation and technical rules and be connected to new or existing solar PV. Capacity alone does not establish eligibility.

What is the battery STC factor in 2026 and 2027?

For eligible batteries installed from 1 May to 31 December 2026, the published base factor is 6.8. For installations from 1 January to 30 June 2027, it falls to 5.7. It then falls to 5.2 for July to December 2027, with further scheduled six-month reductions through 2030.

DCCEEW's current guidance says the applicable factor is determined by when the battery is installed and certified. Signing a contract before a scheduled reduction does not, by itself, lock in the earlier entitlement.

The scheduled reduction can matter when comparing timing, but it should not override equipment suitability, electrical design, installer quality or the household's actual need for storage.

How does support change at 14 kWh, 28 kWh and 50 kWh?

Since 1 May 2026, support is tapered by usable capacity. Additional storage can still receive support, but at a lower share of the applicable base factor.

The tier contributions are added and the resulting certificate entitlement is rounded down to a whole STC. A larger battery can still be the right household choice, but certificate support does not increase linearly with storage capacity.

Why doesn't a 30 kWh battery receive three times the support of a 10 kWh battery?

If both figures represented usable capacity, a 10 kWh battery would sit entirely inside the first tier, so all 10 kWh would use 100 per cent of the applicable factor.

A 30 kWh usable battery is treated in three portions: the first 14 kWh at 100 per cent, the next 14 kWh at 60 per cent, and the final 2 kWh at 15 per cent. In support-weighted terms, that is equivalent to 22.7 kWh at the full factor, not 30 kWh.

The Clean Energy Regulator's published example uses the same method: a 40 kWh usable battery in the May–December 2026 period produces 164 STCs after the whole result is rounded down.

This is why battery size should be chosen for household value first. The certificate discount reduces net cost; it is not a reason to buy storage the home is unlikely to use.

Work through battery sizing before chasing the maximum discount ↗

Can you claim the discount when the property already has solar?

Yes, an eligible battery can be connected to new or existing solar. A homeowner does not need to replace a healthy solar system simply because storage is being added.

For an existing-solar retrofit, the inverter connected to the eligible battery must satisfy the program's current VPP-capability and other technical requirements. Other existing solar inverters at the property do not automatically need to be VPP-capable or replaced merely because the home is claiming battery STCs.

Existing-battery premises and later capacity expansions have additional program conditions, so a second battery should never be presented as automatically eligible for another discount.

See the existing-solar battery retrofit guide ↗

How should the federal battery discount appear in a quote?

Do not compare two quotes by headline "rebate" alone. One retailer may use a different certificate value or have already incorporated the STC benefit into its advertised price.

Use the quote comparison guide to compare battery proposals consistently ↗