What does a home battery cost and when does it pay off?

The biggest factor is capacity: how many kilowatt-hours the battery holds. On top of that come power, brand, whether you need a hybrid inverter, and the installation itself. A bigger battery costs more, but only earns more if you actually use that room.

We deliberately don't show a fixed price here, because it moves. Your quote carries a current figure for your situation.

In practice at SolarFast you often see systems between 5 and 10 kWh, for example Dyness modules. A 5 kWh unit is typically a few thousand euros less than a 10 kWh setup with a hybrid inverter. If the fuse box needs upgrading, that appears as a separate line in the quote.

A battery pays back by letting you use power yourself that you would otherwise buy at a high rate. That works best if you use a lot in the evening, if the feed-in payment is low, or if you have a heat pump or EV charger. The less net metering gives you, the stronger the case.

On our with versus without home battery comparison page we put the trade-offs side by side, so you can see when storage makes sense for your situation.

While net metering still applies broadly, the gain from storage is smaller, because feed-in is well paid. As the scheme is phased down, storing your own power becomes more attractive. With a dynamic contract through Frank Energie you can also charge when power is cheap.

We look at your yearly use, how much of it falls in the evening, your feed-in payment and your tariff. From that follows how much a battery saves you per year and within what period it pays back.

You get a no-obligation quote within 24 hours with a current figure. No fixed price on this page, but numbers that hold today for your fuse box and consumption.