Sizing · solar panels + battery
Which home battery fits your solar panels?
Solar panels generate electricity during the day, but many households use most power in the evening. A home battery helps store that surplus. The right capacity depends on your panels, usage and evening demand.
- From panels to kWh
- Match capacity to your generation, surplus and evening usage.
- Examples per size
- See what 5, 10, 15 or 20 kWh means for your number of panels.
- No sales talk
- Indicative sizing advice based on your situation, no hard promises.
Why solar panels and battery together?
Without a battery you feed part of your solar power back to the grid. With a battery you use that power later — especially in the evening when you often use the most.
- Use more of your own solar power in the evening
- Less dependent on fluctuating electricity prices
- Match capacity to your surplus and usage
- No hard savings promise — sizing advice based on your situation
Example: 12 panels and evening usage
An indicative example for a family with 12 solar panels and about 4,000 kWh annual usage. Guidelines, not a guarantee.
With 10 kWh you cover a large part of your evening usage on an average summer day. With more panels or higher usage, 15 or 20 kWh makes more sense.
From panels to required kWh
The right battery capacity depends not only on the number of panels, but on the combination with your usage pattern.
Frequently asked questions
Do I need solar panels for a home battery?
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.
How many kWh battery with 10 solar panels?
With 10 solar panels and an average family, 10 kWh is often a logical start. Exact advice depends on your annual usage, evening usage and whether you have a heat pump or electric car.
Can I store my full surplus?
On sunny days your surplus is often larger than the battery capacity. The battery captures part of it; the rest goes to the grid. So sizing is a balance between surplus and what you really need in the evening.
Does a battery work without solar panels?
Yes, sometimes. With a dynamic energy contract you can charge at cheap moments and discharge when prices are higher. Solar panels usually make it more interesting though.
Which capacity fits your solar panels?
Calculate the suitable battery capacity based on your panels, usage and evening demand at no obligation.
Calculate your capacityFilled in within 1 minute · Free advice · No obligation