EnergieTechnicsHonest adviceclear pricing

What home battery capacity will you choose?

Why the right capacity follows from your consumption and generation, not from the largest model.

What can we help you with?

Rather speak to someone right away?0494 37 68 68

We only use your number to call you back. Privacy policy

Choose what you want to tackle. Several is fine.

Step 1 of 2

Want a more detailed answer? Take the EnergieUpgrade Scan

The question of what capacity of home battery you need comes up often. Salespeople sometimes point straight to the largest model, as if more kWh is always better. That is not how it works. The right capacity follows from how you consume and how much you generate, and that combination is different for everyone.

We take you through the common sizes, from 5 kWh through 10 kWh to 20 kWh, and show you how to make a choice that fits. A battery that you rarely get full or empty is money sitting still. One that is too small leaves generated energy unused.

5, 10 or 20 kWh: what does that mean?

The capacity in kWh indicates how much energy the battery can store. A system of 5 kWh holds less than one of 10 kWh, and 20 kWh goes above that. More kWh means that you have a larger buffer to use generated energy later.

That buffer only makes sense if your consumption and generation fill and empty it. A family with solar panels and a heat pump consumes differently from a couple without large consumers. That is why the number alone says nothing. It is about the match with your daily pattern.

Choosing a capacity based on your consumption

We look at your annual consumption and, more importantly, at when you consume. Those who are at home a lot during the day use generated solar energy straight away and need less storage. Those who mainly consume in the evening get more out of a battery that stores the day's production for later.

Your generation also counts. If you have a substantial solar panel installation, there is more surplus to store during the day. If your panels have limited output, a large battery will not fill up and you pay for space that remains empty. Now that the reversing meter has been phased out, self-consumption through storage becomes more attractive, but only if the capacity matches what you generate.

Not the largest model, but the right one

The temptation to choose a large capacity is understandable, but oversizing delivers nothing extra. A battery you never fully use takes longer to pay for itself. The capacity tariff also rewards more even consumption, which plays a role in how you deploy the battery.

What a given capacity delivers depends on your home, your consumption, your installation and energy prices. We work this through with you during a site visit and recommend a size that fits, rather than recommending the largest model by default.

Urgent intervention

Urgent electrical problem?

Briefly describe what is going on. Call for an urgent intervention or leave your number and we will call you back as soon as possible.

  • Power outage
  • Short circuit
  • Fuse keeps tripping
  • East & West Flanders, Antwerp
Call for a callout0494 37 68 68

We only use your number to call you back. Privacy policy

What we look at

Your annual consumption

How many kWh you use over a year, as a starting point.

When you consume

Do you consume during the day or mainly in the evening? That determines how much storage makes sense.

Your generation

How much your solar panels produce and how much is left over to store.

Heavy consumers

A heat pump or charging point changes your consumption pattern considerably.

This is how we determine your capacity

  1. 1

    Mapping consumption

    We look at your annual consumption and when you use energy.

  2. 2

    Taking generation into account

    We look at how much you generate and how much is left over during the day.

  3. 3

    Proposing a suitable size

    You get a capacity that fits your situation, not the largest one by default.

Frequently asked questions

Is a larger home battery always better?
No. A battery you do not fully use pays for itself more slowly. The right capacity follows from your consumption and generation, not from the largest available model.
Do I need 5, 10 or 20 kWh?
That depends on your annual consumption, when you consume and how much you generate. A family with a heat pump usually chooses differently from a couple without heavy consumers. We determine the size after a site visit.
What if my consumption changes later?
Plans to install a heat pump or EV charger change your consumption pattern. Tell us your plans, and we will take them into account when choosing the capacity.
Does the capacity tariff affect my choice?
The capacity tariff rewards more even consumption, which plays a role in how you use the battery. We include that in the advice, tailored to your situation.

Read also

What capacity suits your home?

Let us look at your consumption and generation. We propose a capacity that matches your situation, without pushing a model that is too large.

Request a quoteView services
Call Murat0494 37 68 68Request a quote