Guide
Is a home battery worth it?
A home battery lets you store cheap or solar power and use it when prices are high. For some homes that is a clear win; for others, panels alone make more sense. Here is how to tell which is you.
At a glance
- A battery shifts when you use power; it doesn't generate it
- Worth it most with a big day-night price gap, an EV or lots of export
- Flat tariff and high self-use? Panels alone often win
- Adding storage later is easy, and battery prices keep falling
What a battery actually does
A battery stores electricity - from your panels at midday, or from the grid when prices are low - and releases it in the evening when power is expensive. It does not create energy; it shifts when you use it. The saving comes from the gap between cheap and expensive hours, plus using more of your own solar instead of exporting it.
When a battery is worth it
Storage pays off best when the daily price swing is large, when you export a lot of unused solar, or when you have an EV or a time-of-use tariff to exploit cheap hours. The bigger the difference between your cheapest and priciest electricity, the more a battery earns.
When to skip it for now
If you use most of your solar as it is produced, have a small price spread, or a flat tariff, a battery can sit half-used and pay back slowly. Many homes are better off starting with panels and adding a battery later, once tariffs or an EV change the maths. Battery prices are also still falling, so waiting has a real upside.
Running the numbers
The calculator models a system with and without storage so you can see the difference for your usage and tariff. Compare the two: if the battery's extra saving is small relative to its cost, panels alone are the smarter first step.
Common questions
- Does a battery pay for itself?
- It can, but more slowly than the panels. Payback depends on the gap between your cheap and expensive electricity hours and how much surplus solar you would otherwise export. With a big price spread or an EV it pays off well; with a flat tariff it can take a long time.
- Can I add a battery later?
- Yes. Most solar setups are battery-ready or can be retrofitted, so you can start with panels and add storage once it makes sense. Since battery prices are still falling, waiting often means a better deal.
- How big a battery do I need?
- Enough to cover your evening use without paying for capacity you never cycle. A battery sized to your typical overnight consumption usually beats an oversized one that rarely empties. The calculator suggests a sensible size for your household.
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