Find out what a home battery really saves you
HomeBattery.com compares capacities, brands and payback times using honest, conservative calculations. No sales talk, just the numbers you need before you decide.
Independent
We sell nothing, ever
Conservative
Honest, no inflated savings
Hourly data
8,760 hours simulated per year
We would rather be right than optimistic
Most battery calculators use smooth yearly averages, which quietly overstate savings. Here is what we do differently.
Independent
We sell nothing, so nothing changes the numbers you see.
Hourly model
Every calculation runs the full 8,760 hours of the year, not an average.
Local data
Tariffs, VAT and incentives are matched to your own country.
Conservative
Savings are capped at what you actually use at night.
The home battery calculator
Enter your annual consumption and solar export to see the recommended battery size, yearly savings and payback time for your country. Every figure is editable.
- 8,760 hour simulation, not a yearly average
- Local tariffs, VAT rules and incentives included
- Free PDF report of your result
Typical UK household, 8 kWh battery
Illustrative example. Your own result depends on your usage and country.
Everything you need before you buy
Sizing
Which capacity fits your home?
From 5 to 60 kWh, what each size covers and why bigger is not always better.
Compare capacitiesCosts
What is the real payback?
Honest payback ranges per country, including VAT rules, feed-in changes and grid fees.
Calculate paybackMarket
News and analysis
Regulation, tariffs and new products explained in plain language, updated weekly.
Read the insightsFrom question to decision in three steps
Know your usage
Find your annual consumption and, if you have solar, roughly how much you export to the grid each year.
On your energy bill
Run the calculator
Get a recommended capacity, yearly savings and payback range, with every assumption shown.
About two minutes
Compare systems
Check scalability, backup power and how well the system copes with dynamic, time of use tariffs.
Before you buy
See how HomeBattery.com works
A short walkthrough of the calculator and how we keep the numbers honest. More videos are on the way as we cover capacities, payback and country-specific incentives.
The questions you actually have
Is a home battery worth it without solar panels?
Only with a dynamic or time of use tariff. Without price differences there is nothing to arbitrage.
How many kWh do I need?
Size to your evening and night consumption, not your total daily use. Our calculator does this per hour.
Can a plug-in battery power my whole house?
No. An 800 W plug-in unit cannot cover a 3 kW evening peak. Output power decides what it can carry.
How long does a home battery last?
Most are warrantied for around ten years or a set number of charge cycles, whichever comes first.