For most homes, a battery is worth it only when it has a paying job to do. There are three: storing your own solar power for the evening, moving grid electricity from a cheap hour to a pricey one, or covering outages you actually experience. If none is real in your house, the battery is an expensive box ageing on your wall.
Key Takeaways
- A home battery pays only through a job: storing your solar, shifting across a real rate gap, or covering real outages.
- No universal payback figure exists — prices and usage patterns are household-specific.
- Run the audit on your own bills, tariff, solar export and outage history before getting quotes.
- The warranty’s three terms set the earning life every value claim must fit inside.
The Three Jobs, and What Each One Needs
| Job | What has to be true | Where the value comes from |
|---|---|---|
| Storing your solar | Your panels export power the house could use later | Energy you stop exporting for little and buying back at full price |
| Shifting grid electricity | Your tariff has a real gap between cheap and standard hours | Every kilowatt-hour moved earns the gap between the rates |
| Backup | Outages are frequent, or one would cost you dearly | Avoided losses: spoiled food, no heating, no work connection |
No universal payback figure exists — anyone quoting one for every house is guessing. Prices vary by home; value is your own usage. Our guide to solar panels and EV chargers covers the pairing the first job usually serves.
Run the Audit With Your Own Numbers
Five checks, all from documents you already have:
- Your last 12 months of bills. How much electricity the house uses, and when.
- Your tariff sheet. Is there a genuine gap between cheap and standard hours? Shifted energy times that gap is the whole second job; with no gap, it earns nothing. Smart charging and time-of-use tariffs work through the scheduling side.
- Your solar export. Does the system send power out at midday that the house buys back in the evening?
- Your outage history. How many cuts last year, and what did they cost you?
- The warranty terms. Years, cycling allowed and end-of-term capacity set the battery’s earning life — every value claim must fit inside them.
The EV in the Driveway Changes the Sum
Charging the car from the battery spends the battery’s working cycles on the car — right on a solar-heavy day, wasteful on a flat tariff. And if your car supports bidirectional charging, it may cover the backup job with no fixed battery at all: is bidirectional charging worth it? works through that side.
Full disclosure: EVDANCE makes chargers, not home batteries — we have no battery to sell you. That decision belongs with its maker and your installer. What the charger side controls is timing: a scheduled charge fills the car in cheap hours or from stored solar, unwatched.
When the Honest Answer Is No
- Your tariff is flat, with no cheap hours to shift from.
- You have no solar and outages are rare and short.
- The house uses little electricity, so there is little to store or shift.
- You expect to move before the battery’s earning years have run.
Incentives can move the answer; they vary by state and change over time. The DSIRE database lists current programmes by location — check yours, and treat any figure as the programme’s, not a promise.
Charging That Works With Stored Energy
Either way, the car’s charging should follow the house’s energy schedule. The EVDANCE EV-ACT3204PE 22 kW wallbox (three-phase, tethered Type 2 cable, RFID and app, CE) takes a scheduled start in its app, so sessions land in cheap or sunny hours by themselves. More home options are on our residential charging solutions page.
Frequently Asked Questions
Does a home battery lower the cost of charging my EV?
Only if it hands the car energy that cost less than the grid price at charging time — stored solar, or electricity bought in cheap hours. The battery creates no saving; the price gap does. How much it costs to charge an electric car at home is the baseline it must beat.
Can I skip the home battery and use my EV instead?
Partly, if the car supports V2L or V2H — especially for backup. The car is not always home or plugged in, and a fixed battery works with any car. Many homes treat the two as layers, not rivals.
How long does a home battery keep earning?
Its working life is set by time and cycling; the written answer is the warranty: years covered, cycling allowed, capacity guaranteed at the end. Match those three terms to the job you are buying it for.
Related Reading
- Solar Panels and EV Chargers: How to Charge Your Car With Sunshine
- Is Bidirectional Charging Worth It?
- Smart Charging and Time-of-Use Tariffs: How Scheduling Cuts EV Charging Costs
- How Much Does It Cost to Charge an Electric Car at Home?
