Capacity calculation
How many kWh home battery do you need?
Determine which battery capacity (kWh) fits your electricity use, solar panels, fuse box and energy contract. The calculator gives an initial sizing indication — with no purchase obligation.
Or start the free calculator · Completely no obligation
Receive your personal home battery calculation
We will send you a more detailed estimate and can help you with the next step, with no obligation.
- Done within 1 minute
- Quick to fill in, instant initial indication.
- Tailored advice
- Matched to your home and usage.
- Safe & trusted
- Your details are handled carefully.
The calculator
Instant insight into the right battery capacity
The calculator gives you an initial sizing indication: which kWh fits your usage, solar panels and energy contract, and how much more of your own power you can use.
- Suitable capacity: 5, 10 or 15 kWh
- Self-use indication: up to 60% – 80%
- Sizing advice based on your situation
- No contact details needed
Instant insight with our calculator
Your first estimate
40%
of your own power
5 – 10 kWh
60% – 80%
Probably interesting
First sizing indication based on your answers.
Why calculate first?
A home battery can be interesting, but not in the same way for every household. The right capacity depends on your solar panels, usage, energy contract and when you use power. With the calculator you get a clear sizing indication first, without being tied to anything.
More insight
See straight away whether a home battery could make sense for your situation.
No obligation
You do not need to leave your details to see the initial calculation.
More targeted advice
Want to go further? We can give more personal advice based on your results.
Capacity per kWh
Each size fits a different situation. Compare common capacities and discover which home battery fits your usage and solar panels.
- 5 kWhWho is 5 kWh right for?5 kWh usually suits a small household or a home that uses little during the day and has modest energy needs in the evening.
- 10 kWhWho is 10 kWh right for?10 kWh is usually right for a family in a terraced or semi-detached home with average to slightly above-average electricity usage and a normal solar panel system.
- 15 kWhWho is 15 kWh right for?15 kWh suits a large household with above-average usage and a sizeable solar panel system that wants more buffer than 10 kWh without going straight to 20 kWh.
- 20 kWhWho is 20 kWh right for?20 kWh is usually only worthwhile if your usage is well above average and you want to keep plenty of your own solar energy for evening and night.
Or read more about home battery with solar panels
Lots of solar power generated, but little used yourself?
Many households feed power back to the grid during the day while needing electricity in the evening. A home battery can help use more of your own solar energy. Whether it pays off depends on your home, usage, panels and contract.
That is why we start with a capacity calculation based on your situation.
How the capacity calculation works
- Stap 1
Enter your situation
Answer questions about your home, solar panels, electricity use and energy contract.
- Stap 2
Receive a sizing indication
Based on your input you get an indicative capacity and a first benefit estimate.
- Stap 3
Optional: request advice
Want more detail? Request personal advice with no purchase obligation.
Indicative result · No purchase obligation
Why people calculate via thuisaccuKWH.nl
A home battery is an investment. You want to know which capacity fits, what it costs and under what conditions it makes sense. We help you with clear sizing criteria first.
Free and no obligation
The check costs nothing and commits you to nothing.
Advice based on your situation
Not a standard answer, but an estimate based on your home, panels and usage.
Secure handling of data
Your request goes to SolarFast, who will help you further. We only use your details for that request, after your explicit consent.
Honest assessment
If a home battery is not interesting for you, that should be clear too.
A well-founded sizing choice starts with the right input.
What can a home battery mean for you?
With a home battery you store generated solar energy temporarily so you can use it later yourself. This can be especially relevant with high generation, a dynamic contract or less dependence on the grid.
- Use more of your own solar energy
- Buy less power at expensive times
- Respond smarter to dynamic energy prices
- Less dependence on changes to net metering
- More control over energy costs
- Prepare your home for the future
A first sizing indication within minutes.
Smart with energy prices
Store power when it is advantageous
A home battery can help you manage energy prices and your own usage smarter. Especially with a dynamic energy contract, the timing of charging and discharging can make a big difference.
- Charge cheaply at quiet moments
- Avoid expensive moments with stored power
- Smart consumption with dynamic prices
- More control over your energy costs
Smart use of energy prices
Charge when cheap
Laag
Avoid peak
Hoog
Smart consumption
5–10 kWh
Personal advice
Calculate first, then leave your details
Want to know what it means for your home after the initial calculation? Leave your details for a more personal estimate. Free and no obligation.
- Personal calculation based on your situation
- Tailored advice for your home
- No obligation after your request
- Your details are only used for your request
Who is a home battery especially relevant for?
Homeowners with solar panels
You generate during the day and want to use that power later.
Households with higher usage
For example due to electric cooking, AC, heat pump or EV.
People with a dynamic energy contract
You want to respond to cheaper or more expensive periods.
Forward-looking homeowners
You want to prepare for changes in the energy market.
Not every home battery fits every home
The right choice depends on usage, panel count, inverter, contract and future plans. A well-founded sizing choice matters more than brand or price alone.
- What capacity do I need?
- Does the battery fit my current installation?
- What is a realistic payback period?
- Which brands and solutions are suitable?
- Install now or wait?
Installation & safety
A battery that fits your home
Not every battery suits every home. That is why it is important to look at your fuse box, inverter, solar panels, usage and energy contract.
- Safe installation by certified professionals
- Fits your fuse box and inverter
- Capacity and usage check
- Personal advice before installation
Installation & safety
Everything checked before installation
Suitable
Compatible
Checked
- Safe installation
- Fits your home
- Capacity check
- Advice upfront
Frequently asked questions
It mainly depends on your electricity usage, number of solar panels and evening/night usage. For an average family around 10 kWh is often suitable; with a heat pump or electric car a larger size like 20 kWh makes more sense. Use the capacity check to calculate which size fits your situation.
Yes. The check is free and no obligation. You enter your details and we look at what options there are for your home. You are not committed to anything.
A home battery can be interesting if you have solar panels, use relatively much electricity or want to manage energy prices smartly. The exact outcome depends on your personal situation.
Solar panels often make a home battery more interesting because you can store generated power for later use. Without solar panels there are sometimes options too, for example with a dynamic energy contract.
Experiences from homeowners
I was not sure which battery capacity I needed. The check gave clarity quickly and the advice was clear.
Good that I did not have to buy immediately. First they checked whether a battery made sense for our household.
Clear explanation of capacity and what to look for. That made sizing much easier.
Ready to discover if a home battery fits your home?
Calculate at no obligation what a home battery can do for you and receive advice based on your home, solar panels and energy usage.
Start the free calculatorFilled in within 1 minute · Free advice · No obligation