The ideal battery size depends on how much electricity you use in the evening and at night, and how much solar power you generate during the day. A well-chosen capacity makes optimal use of your solar power without unnecessary investment.
- Match the battery to your evening/night consumption
- Too big is a waste, too small means you don't fully utilise your solar power
- Your solar generation determines how much you can store
- A modular system grows with you
Look at your evening consumption
The battery primarily bridges the evening and night, when your panels are not generating power. Your evening and night consumption is therefore the most important guide for the capacity (in kWh).
Match it to your solar generation
A battery cannot store more than what you have left over during the day. With few panels, a large battery makes little sense; with high generation, it makes more sense. We balance generation and consumption.
Modular grows with you
Many systems are modular: you start with a suitable size and expand later, for example when you switch to electric driving. This way, you never invest too much at once.
Frequently asked questions
Can I expand a battery later?
With modular systems, yes. We recommend a setup that can grow with you.
Is a larger battery always better?
No. Beyond your daily surplus, extra capacity adds little value. We calculate the optimal size for you.
Curious about what this means for your home?
Take the free sustainability check with your address; you will immediately see your energy label, roof area and savings opportunities.