A home battery lets you use your solar after dark and ride through outages — but how much does it really save? Here is what drives the numbers.
What a battery actually does
A home battery stores the solar energy your panels generate during the day so you can use it at night — instead of buying expensive grid power during the evening peak. It can also keep essential circuits running during a blackout.
What drives your battery savings
- Evening usage. The more power you use after dark, the more a battery saves.
- Solar size. You need enough surplus solar to charge the battery each day.
- Tariff. Big gaps between peak and off-peak rates make a battery more valuable.
- Battery size. A 10kWh battery suits many homes; larger homes may benefit from 13kWh or more.
Typical savings and payback
Many households use a battery to avoid a large share of their evening grid usage. Combined with solar, this can lift total bill savings well beyond what solar achieves alone. Payback varies more than solar — it depends heavily on your usage pattern and tariff.
Indicative only. Your savings depend on usage, tariff and system size.
Don't forget backup
Beyond savings, many homeowners value the peace of mind of keeping the fridge, lights and internet running during an outage. Backup capability depends on your system setup.
See your numbers
The best way to understand battery value for your home is to compare options for your address and usage — it's free and takes a couple of minutes.
Frequently asked questions
How much can a home battery save me?
Savings depend on how much power you use in the evening, your solar size and your tariff. A battery lets you use stored solar at night instead of buying peak grid power, which can lift your total savings well beyond solar alone.
What size home battery do I need?
A 10kWh battery suits many households, while larger homes or those with high evening usage may benefit from 13kWh or more. The right size depends on your usage and solar system — a quick comparison gives a tailored recommendation.
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