Question 1

Is a home battery worth it in the UK?

Accepted Answer

It depends on how much electricity you use, when you use it, whether you have solar, and how large the gap is between peak and off-peak tariff rates. This calculator models each of those factors and shows the payback period, net savings and a suitability score so you can see the honest answer for your household — including cases where a battery does not pay for itself.

Question 2

What battery size should I get?

Accepted Answer

A battery is only worth paying for if it can be filled and discharged most days. Oversized batteries sit half-empty and pay back slowly. Our recommended size range is based on your overnight electricity use, solar surplus, and whether you have an EV or heat pump.

Question 3

How accurate is the ROI figure?

Accepted Answer

It is an illustrative estimate, not a quote. Real-world savings depend on weather, tariff changes, battery controls, installation quality and household behaviour. Our engine models degradation, round-trip efficiency, warranty cycle limits and lost SEG income to keep results realistic, not optimistic.

Question 4

Does storing solar cost me my SEG income?

Accepted Answer

Yes — every kWh you store instead of exporting is a kWh you don't get paid for. We deduct lost SEG income from your savings automatically. When your SEG rate is high, a battery is less financially attractive because you're giving up more export income.

Would a battery be worth the upfront cost?

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Solar Panels and Home Batteries: The Honest Buyer's Guide

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