What does a home battery cost and when does it pay off?
How to weigh the cost and return of a home battery: what sets the price, when payback is realistic, and how net metering plays in.
What a home battery costs depends mostly on capacity and installation. Whether it pays off is not about price alone, but about how much of your own power it lets you save.
What sets the price?
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.
When does a home battery pay off?
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.
Net metering and dynamic rates
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 you can also charge when power is cheap.
How to do the maths
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. We are glad to do that sum with you, using figures that hold today.
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