Home solar batteries, working after sunset.

The Cheaper Home Batteries Program pays through small-scale technology certificates (STCs), calculated on the battery's usable capacity, not the number on the label. For installs from May to December 2026, the first 14 kWh earn the full rate, the next 14 kWh earn 60% and capacity from 28 to 50 kWh earns 15%. As an estimate, a 10 kWh usable battery attracts about $2,520 and a 24 kWh usable battery about $5,040. The certificate price moves, and the rate steps down from 1 January 2027, so your quote fixes the figure for your install date.

Not an upfront one for houses. The NSW battery installation discount only applied to homes installed before 1 July 2025 and you cannot claim it alongside the federal discount. What NSW does offer is the virtual power plant (VPP) incentive: a payment for connecting an eligible battery to a participating VPP, which can be combined with the federal discount. The amount depends on the capacity you make available to the grid (capped at 28 kWh) and on the provider's offer.

Only if the system is designed for it. Grid-connected solar switches off in an outage to protect line workers, battery or not. To keep running, you need a battery and inverter that support backup, set up to supply either the whole home or a group of essential circuits. On a three-phase home, a single-phase system only backs up circuits on its own phase. Ask what your quote backs up, in writing, before you sign.

Size it from what you use between late afternoon and the next morning, not from your total daily usage. If your smart meter data shows about 10 kWh in that window, a battery with roughly 10 kWh usable will cover most nights. Bigger only pays off if your panels can refill it on an ordinary day and you have the evening load to empty it.

Usually, yes. Either an AC-coupled battery with its own inverter sits alongside your current system, or your solar inverter is swapped for a hybrid that runs both. For the federal discount, a kept inverter must be on the Clean Energy Council list (or have been when your solar was commissioned) and be able to join a VPP; if it isn't, it has to be replaced.

No. The battery must be capable of joining a VPP, but joining is your choice. Joining one is what unlocks the separate NSW VPP incentive, in exchange for letting the operator discharge your battery at times the grid needs it, on the terms in their contract.

Not in a habitable room such as a bedroom or living area. Garages (with bollard protection where a car could hit it) and outside walls are the usual spots. The battery standard also sets distances from doors, windows and ventilation openings and rules about the wall behind the battery — we check those at the site visit.

Warranties are usually written as a number of years, a total energy throughput, and a capacity the battery must keep — whichever limit is reached first. Payback depends on your price after rebates and on what each stored kWh saves you. As an estimate on typical NSW tariffs, a 10 kWh usable battery doing 300 full cycles a year is worth about $810 a year; divide your net price by your own figure to get the years.