Home Battery Calculator

What Will a Battery Save You?

Our free home battery calculator shows in 30 seconds how much a home battery can save you per year — based on the electricity prices, feed-in rules, taxes and incentives in your country. Select your location, enter your annual consumption and solar export, and instantly see the recommended battery size, yearly savings and payback time. Every number is editable, so you can match it exactly to your own energy contract.

Why battery savings depend on where you live

Home battery economics are local. The same battery pays back in 5 years in one country and 15 in another. The four factors that matter most:

Electricity price

The more you pay per kWh, the more each stored kWh is worth. We pre-fill the average for your location; adjust it to your own supplier’s rate (e.g. €0.25 vs €0.29/kWh makes a real difference over 10 years).

Feed-in rules 

With full net metering, the grid acts as a free battery and storage savings are small. With low feed-in rates (Germany, Australia, California NEM 3.0) or no compensation at all (Indonesia, Morocco, Qatar), a battery captures value that would otherwise be lost.

Dynamic electricity prices

In markets with hourly pricing (Netherlands, Germany, Nordics, UK, Texas, Australia), a smart battery charges cheap and discharges expensive, adding savings on top of self-consumption. In many countries dynamic contracts don’t exist yet — the calculator only shows this scenario where it’s available.

Taxes and incentives 

Examples the calculator accounts for: Germany charges 0% VAT on batteries installed with solar; the UK charges 0% VAT on battery storage until March 2027; the Netherlands charges 21% VAT but traders with a dynamic contract can reclaim it; Belgium charges 21% with no refund route; Australia gives an upfront rebate of roughly A$330 per kWh; Sweden refunds up to ~48.5% via the green technology deduction.

About our platform HomeBattery.com
News and insights home batteries

How the calculator works?

  • Choose your country (and state/province for the US and Canada).
  • Enter your yearly grid consumption and solar export.
  • We recommend a battery size and show yearly savings and payback for self-consumption — and for a dynamic tariff where available.
  • Open advanced settings to fine-tune prices, battery cost, efficiency and cycles.

Newsletter form

This field is for validation purposes and should be left unchanged.
Name(Required)
Privacy(Required)

Guiding homeowners with clear and reliable information

At HomeBattery.com, we are here to guide people through the changing world of energy storage. Whether someone is just starting to learn about home batteries or is already comparing different solutions, we want to provide the information and insights they need to move forward with confidence.