Is Solar + Battery Storage Worth It in 2026? Honest Analysis

Published by AFTA Electrical · May 2026 · Solar PV

For most homeowners in Essex, Suffolk, Norfolk, Cambridgeshire, and Hertfordshire — yes, solar and battery is worth it. But the numbers depend heavily on your current electricity usage, your tariff, and how well the system is sized to your property. Let's go through it properly.

The Basic Maths

A 6kW solar system with 10kWh battery costs approximately £13,995 installed (0% VAT). Over a year, a well-positioned 6kW system generates around 5,400 kWh. Of that, a household using 3,500–4,000 kWh/year might self-consume 70–80% with a battery — call it 4,000 kWh of free electricity.

At 24p/kWh (current mid-range Ofgem cap rate), that's £960/year in savings. Add SEG export payments of £150–£300/year. Total benefit: approximately £1,100–£1,260/year.

At that rate, payback on a £13,995 system is 11–13 years. System lifespan is 25+ years for the panels, 10–15 years for the battery (at which point replacement cost is lower than the original). Net financial benefit over 25 years: significant.

What Improves the Numbers

Time-of-use tariff (Octopus Intelligent, Cosy Octopus etc.): Charge the battery cheaply overnight at 7–10p/kWh, use that electricity at 24p/kWh instead of importing it. Adds £300–£600/year to the equation.
EV charging: If you drive an electric vehicle, a battery can charge your car from solar generation rather than grid electricity, dramatically increasing the value of each kWh generated.
Rising electricity prices: If electricity prices rise (historically they have), your savings grow proportionally. Solar generation cost is fixed.

Who Gets the Best Return

Best returns are seen by households that:

Use a lot of electricity (3,500+ kWh/year)
Are at home during the day (can use solar as it's generated)
Have an EV (significantly increases the value of home generation)
Can switch to a time-of-use tariff
Have a south-facing roof with minimal shading

Who Should Wait

If your roof faces north, is heavily shaded, or is unsuitable for panels, solar is unlikely to make financial sense. Similarly, if you're planning to move within 3–4 years, the payback won't materialise in that timeframe (though solar does add value to a property at sale).

The right size matters enormously. Oversizing a system doesn't necessarily improve the return — if you generate far more than you can use or store, the export rate (4–15p) is much lower than the import rate you're saving (24p). We size systems based on your actual usage data.

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AFTA Electrical covers Essex, Suffolk, Norfolk, Cambridgeshire, and Hertfordshire. NAPIT & TrustMark registered.

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Frequently Asked Questions

For most homes with suitable roofs and reasonable electricity usage, yes. Payback periods are typically 6–11 years on a system designed to last 25+ years. Time-of-use tariffs and EVs significantly improve the return.

Yes — a battery allows you to use your solar generation in the evening rather than exporting it at a lower rate. For homes where occupants are out during the day, battery storage can dramatically improve self-consumption.

Generally yes. Studies suggest solar adds 1–4% to property values. An professionally installed system with transferable warranty and a valid EIC is a positive in property searches. Buyers increasingly see solar as a desirable feature.

In the UK, a south-facing 4kW system generates approximately 3,400–3,800 kWh per year depending on location and shading. East or west-facing systems generate 15–20% less.

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