A home battery without solar panels: does it pay?

Without solar panels there is no own generation to store. The battery then draws its power from the grid, at moments when it is cheap. That only makes sense with a dynamic energy contract, where the price differs per hour: at night and on sunny afternoons power is often cheap, during the evening peak expensive.

The battery charges automatically during the cheapest hours and uses that power during the expensive hours for your own consumption, or feeds it back to the grid. That gap between purchase price and moment of use is the entire business case. There is a loss in it too: part of the power is lost during charging and discharging, so the price difference must be large enough to cover that.

Three things. A dynamic energy contract, because with a fixed rate there is nothing to shift: every kilowatt-hour costs the same, whenever you charge. A smart meter, so consumption and feed-in are registered per hour. And a battery with an inverter that can be steered automatically on the hourly prices; switching manually is not workable.

To get more out of the battery, it can also trade automatically on the imbalance market, where prices move per quarter-hour. That requires a provider that supports it; the HYXi Power systems we install can do this through the link with Frank Energie.

Honesty first: a battery without panels has a narrower business case than a battery with panels. With panels the battery catches two birds: holding on to your own solar power and charging smartly. Without panels only the price game remains. That can work, but it hinges on a few conditions.

What the battery itself costs and how to estimate a realistic payback period is covered in what a home battery costs. During the site survey we calculate with your actual consumption and the contract you have or plan to take; if the sums do not add up, we simply say so.

For most homes with a suitable roof that is the logical order. Solar panels usually pay for themselves faster, and a battery becomes more valuable once there is own generation to hold on to. If you have neither yet, start with solar panels and include the battery as a second step.

There are exceptions. No suitable roof, a rented home where panels are not allowed, or an apartment building where the roof is already full: then the battery-without-panels route is the only one. And whoever mainly wants to trade on price differences does not strictly need the panels. This page is written for those situations.

Even without solar panels, the VAT on a home battery can be reclaimed in certain cases: the core of that route is that you trade in power, not that you generate it yourself. The conditions are precise and worth sorting out in advance; the full explanation is in VAT refund on a home battery.

With a request without panels we first look at your consumption profile and your contract, because the sums stand or fall with those. Then we advise a capacity that matches what you can genuinely shift; a bigger battery than your consumption justifies only stretches the payback period. Which size fits which household is covered in which home battery suits you.

Not sure whether it pays for you? Put your situation to us and we will run the numbers honestly. Or start on our home battery page.