Independent · Free tools · 60+ countries
Find out what a home battery really saves you
HomeBattery.com compares capacities, brands and payback times with honest, conservative calculations. No sales talk — just the numbers you need to decide.
Conservative, honest calculations
Independent — we sell nothing
Hourly simulation, not averages
Updated with local tariffs
Free tool
The home battery calculator
Enter your annual consumption and solar export and see the recommended battery size, yearly savings and payback time for your country. Every number is editable, so you can match it to your own energy contract.
- 8,760-hour simulation — nighttime use is the real ceiling
- Local tariffs, VAT rules and incentives included
- Free PDF report of your result
Start here
Everything you need before you buy
Sizing
Which capacity fits your home?
From 5 to 60 kWh — what each size actually covers, and why bigger is not always better.
Costs
What is the real payback?
Honest payback ranges per country, including VAT rules, feed-in changes and grid fees.
Market
News and analysis
Regulation, tariffs and new products — explained in plain language, updated weekly.
Why us
We would rather be right than optimistic
Most battery calculators use smooth yearly averages, which quietly overstates savings. Ours runs every hour of the year, enforces inverter power limits and caps savings at what you actually use at night.
That means our numbers are usually lower than the ones you will see elsewhere. It also means you can rely on them.
From question to decision in three steps
STEP 1
Know your usage
Find your annual consumption and, if you have solar, how much you export. Both are on your energy bill or in your inverter app.
STEP 2
Run the calculator
You get a recommended capacity, yearly savings and a payback range — with the assumptions shown, not hidden.
STEP 3
Compare systems
Check whether the system can scale later, what backup it offers and how it handles dynamic tariffs.
8,760
hours simulated per calculation
60+
countries with local tariff data
0
batteries sold by us — we only inform
Latest
News and insights
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Home Batteries Explained: Do You Really Need One?
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Estonia Activates 100 MW Hertz 2 Battery System, Strengthening Northern Europe’s Grid Stability
Estonia Activates 100 MW Hertz 2 Battery System, Strengthening Northern Europe’s Grid Stability Estonia has officially commissioned the Hertz 2 battery energy…
Frequently asked questions
Is a home battery worth it without solar panels?
Only with a dynamic or time-of-use tariff. Without solar and without price differences there is nothing to arbitrage, so the battery has no source of savings.
How many kWh do I need?
As a rule of thumb, size the battery to your evening and night consumption, not to your total daily use. Our calculator does this per hour for a full year.
Can a plug-in battery power my whole house?
No. An 800 W plug-in unit cannot cover a 3 kW evening peak. Capacity is only half the story — output power decides what the battery can actually carry.
Newsletter
Keep me up to date
Home battery news, incentive changes and payback insights. Once a month, no sales mail.