Free home battery calculator
Calculate which home battery capacity fits you
Enter your annual consumption and solar panel details for an initial capacity range. The check explains its limits and does not calculate returns or assess installation safety.
- Instant result
- See an initial capacity range with assumptions and limits.
- Simple inputs
- Short questions about usage, panels and home situation.
- No contact details needed
- View the indication without entering contact details.
Calculate which home battery capacity fits you
Enter a few details and get an instant first sizing indication: a range in kWh based on a consumption rule of thumb.
No contact details needed to get started.
Example energy flows
Illustration with example values, not a forecast for your home.
Day and night
Example cycle: charge with solar surplus, discharge when power is needed.
Step 1
Enter your total annual electricity consumption in kWh, including solar power used directly. Grid import on its own is not total consumption. Include existing heat pump and home charging use; leave future equipment for personal advice.
Find this on your solar quote or installation documents. Leave blank if unknown; panel count is not converted into an assumed output.
Heavy consumers
No contact details needed. Your result appears on the right at step 2.
Step 2
Your first home battery estimate
See the consumption guideline and, if you enter the system power, a separate solar guideline. This is an orientation, not installation advice.
First guideline, with limitations
Daily average usage × 60–80%. This is a starting point for assessment, not a purchase recommendation.
Usage guideline
5.8 - 7.7 kWh
Annual usage ÷ 365 × 60–80%
Solar guideline
Not determined
Panel system capacity in kWp × 1–1.5
What this check cannot determine
- Solar capacity is unknown. Only a usage-based guideline is shown.
- The rules do not model hourly profiles, seasons or charging losses. Usage timing and tariffs are not converted into savings.
- A partner still needs to check your installation, usable capacity and power. There is no automatic product recommendation.
Read the capacity guidelines. These are orientation rules, not a simulation of your home.
This is a first sizing indication, not a savings guarantee. Actual outcome depends on your home, installation, energy contract, net metering, usage and battery type.