Backup and blackout protection are not the same thing. A battery only powers your home in an outage if it has a backup gateway. How to size to your evening load, which circuits stay live, and how the new rebates change the payback.
The most common misunderstanding about home batteries is that adding one keeps the lights on in a blackout. By default it does not. Backup and storage are two different jobs, and only one of them comes standard. This guide separates them, shows how to size a battery to your evening load, and explains how the new incentives change the payback.
A standard battery stores your daytime solar so you can use it after dark. That is storage, and it lowers your bill. It does not keep your home powered during an outage. For that you need a backup gateway, a device that safely isolates your home from the grid so the battery can energise your circuits without back-feeding the network. Without the gateway, the battery shuts down in a blackout for the same safety reason a grid-tied inverter does. If staying powered through an outage matters to you, the gateway is the line to ask for, and it is the line the cheap quote leaves off.
For most Hunter homes, 10 to 14kWh covers the evening, which is the window the battery actually has to fill. The solar handles daytime use directly, so the battery only needs to bridge from sundown to the morning. Sizing to your total daily use overbuys; sizing to the evening load gets you the resilience and savings without paying for capacity you never discharge. The number comes straight from your bills: find the usage after the array stops generating and size to that.
We show you the backup gateway, the circuit list and the evening load calc before you sign. The cheap battery quote sells you storage and lets you assume it is backup.
In a backup setup you choose what the battery powers in an outage. Essential-circuit backup covers lights, the fridge and a handful of power points, which keeps a home livable on a modest battery. Whole-home backup powers everything but needs a larger battery and a bigger gateway, and the cost rises accordingly. The right choice is a list: write down what you cannot do without, and wire those circuits to the gateway. Air conditioning and EV charging are the usual lines that push you from essential to whole-home, so decide deliberately. If you are also weighing EV charging, factor that load in now.
The recent federal and NSW battery incentives shorten the payback, sometimes by years. But they do not change the underlying logic: a battery pays by letting you avoid buying power at the peak tariff in the evening, instead of exporting your surplus cheaply. So a home with high evening usage and a high peak tariff sees the fastest return. Read solar rebates and STCs explained for the separate federal and NSW figures, then run them against your own evening load.
You need a battery if you have meaningful evening usage, value resilience, or want to stop exporting cheaply. You need a backup gateway if you want power in an outage. Knowing which of those you are buying is the whole decision, and it should be spelled out on the quote before any deposit.