What Makes a Solar Battery Worth It?
The core financial logic of a home battery is straightforward: electricity you generate and store yourself is worth more than electricity you sell back to the grid. If your utility pays you 5p for exported solar energy but charges you 28p for grid electricity, every unit you store and use yourself saves you 23p rather than earning you 5p — a difference of 4.6x.
The lower your export rate, the stronger the financial case for storage. This is why battery storage is particularly compelling in Australia (where feed-in tariffs have fallen to 5–8c/kWh in many states) and the UK (where SEG rates can be as low as 4p/kWh).
When Batteries Don't Make Financial Sense Yet
If you're on a generous net metering scheme that credits exported energy at close to retail rate, the financial gap between exporting and self-consuming shrinks considerably — and so does the battery's payback argument. Similarly, if your electricity bills are low, the absolute savings a battery can deliver are limited.
Battery prices continue to fall around 10–15% per year. Waiting 2–3 years can reduce the upfront cost meaningfully, particularly if your current export rate is still decent.
Beyond the Financials: Energy Independence and Backup Power
For many households, the appeal of a battery goes beyond pure payback calculations. Stored solar provides backup power during grid outages, and the ability to run your home on your own energy gives a degree of independence from rising electricity prices. These benefits are harder to quantify but are real — especially for households in areas with unreliable grids or those concerned about future energy costs.