What size home battery fits you

Three limits decide the size, and the market talks around them. Work out what the step above the right size actually returns.

Household
kWh
Wp
kW
W

2,4 kWh per day. Read it off your smart meter: the lowest draw you see overnight.

Energy contract

This size fits

4,9-5,5kWh

Tightest limit: 4.4 kWh die je 's nachts opneemt

Je nachtverbruik bepaalt de maat. Panelen en omvormer laten meer toe, maar meer opslaan dan je 's nachts opneemt levert niets op.

Op een vast contract verdien je aan zelfconsumptie, en die vlakt hard af. De stap van 5 naar 10 kWh levert 3 procentpunt op: 30 tot 50 euro per jaar. Als losse uitbreiding kost die stap 1.200 tot 1.800 euro, dus je kijkt tegen 24 tot 60 jaar aan op een apparaat dat er 15 tot 20 meegaat. Nog steeds een slechte investering, maar niet de 70 tot 150 jaar die je krijgt als je hem tegen systeemprijs afrekent.

The three limits

4.4 kWh die je 's nachts opneemt
4,9 - 5,5 kWh
5.2 kWp aan panelen
5,2 - 7,7 kWh
5 kW omvormer
5,0 - 10,0 kWh

What the step above buys you

Measured on one household, around 3,500 kWh a year. Not rescaled to your situation. The first step buys a whole system, from a plug-in set to an installed one; every step above it is only another module, at roughly a third the price per kWh. For comparison: your use is 1,00× that of the measured profile.

StepSelf-consumptionExtra saving per yearWhat the step costsPayback
none30%---
5 kWh65%350 - 5001.200 - 4.5002 - 13
10 kWh68%30 - 501.200 - 1.80024 - 60
15 kWh70%15 - 251.200 - 1.80048 - 120
Where these numbers come from6 source · 4 assumption

This tool sells nothing and asks for nothing. No affiliate links, no brand advice, no email address. Every number above traces back to its source, and where we assume something it says so.

Video thumbnail: Plug-in batteries lead the Dutch market. And nobody is counting them.

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Plug-in batteries lead the Dutch market. And nobody is counting them.

The videos behind these articles. Same numbers, same sources, on video.