22 June 2026

When is a home battery worthwhile?

Not a rule of thumb but a calculation: which four figures decide the outcome, which three situations make a battery more attractive — and when waiting is the better decision.

There is no rule of thumb that holds for every household, and that is the honest answer. Whether a home battery pays for itself depends on four figures: how much electricity you use per year, at which times of day you use it, what your energy contract charges per kilowatt-hour, and how much generation comes off your own roof. Change one of those four and the outcome shifts — the neighbours with an identical roof can have a completely different sum.

Two developments do push that sum in the same direction. The net-metering scheme for solar power fed back to the grid is being phased out, so feeding back gradually yields less and using your own generation becomes relatively more valuable. On top of that, dynamic energy contracts charge a different price per hour, which gives a battery that charges during cheap hours and discharges during expensive ones a business case of its own. We deliberately mention no years or amounts here: those change, and a guide leaning on them is outdated within a season. Check the current position with the national government and your energy supplier.

Three situations make a battery more attractive in practice. You have solar panels that generate more on sunny days than you consume at that moment, while you are rarely home during the day. You have a dynamic contract, or you are considering one. Or your consumption is shifting towards the evening and night, for example through electric cooking, a heat pump or a car charging at home. If none of the three describes you, waiting is a perfectly good decision: a battery that mostly sits half full waiting earns nothing back.

So have it calculated rather than estimated. In a consultation with payback calculation (€ 95-250, often offset against the job), an installer goes through your annual statement and consumption profile and sets the investment from the price index against it. Be wary of a salesperson naming a fixed payback time without knowing your consumption — that figure cannot be known at that point. And if the outcome is that it doesn't add up for you yet, you have avoided an expensive mistake for a small amount.