Solar Battery Storage: Is It Worth It in 2026?

Without a battery, any solar electricity you generate but don’t use immediately is exported to the grid. You earn a few pence per kWh through the Smart Export Guarantee (SEG), but you lose the real value of that electricity.

With a battery, excess solar is stored and used in the evening when your usage peaks. Instead of paying 24p/kWh to buy electricity from the grid, you use your stored solar electricity for free. The value shift is significant: instead of exporting at 4–8p/kWh and buying back at 24p/kWh, you use your own electricity directly.

Sigenergy — A fully integrated inverter and battery platform. The Sigenergy system combines the solar inverter, battery inverter, and EV charger into a single elegant unit. Key features include AI-powered energy management, modular battery expansion from 5 to 30 kWh, and best-in-class round-trip efficiency. Ideal for homes wanting a clean, future-proof installation.

EcoFlow — Known for innovation and reliability, EcoFlow’s home battery systems offer excellent cycle life (6,000+ cycles), flexible capacity options, and smart home integration. Their whole-home backup capability means critical appliances keep running during power cuts.

Both brands offer 10+ year warranties and are designed for the UK climate. We recommend the best fit based on your specific requirements during the design phase.

A 10 kWh battery system costs £4,000–£5,500 installed. To calculate your savings:

• Daily self-consumption boost: A battery typically increases your self-consumption from 30–40% (solar only) to 70–80% (solar + battery). • Value per kWh shifted: Each kWh you use from the battery instead of the grid saves you roughly 16–20p (the difference between grid import price and SEG export rate). • Annual saving: For a 4 kWp system, this typically adds £400–£600 per year in additional savings.

Payback period for the battery element alone: 7–12 years. But factor in rising electricity prices (which increase savings) and the backup power benefit, and the investment makes strong sense.

Some electricity tariffs offer cheaper rates at night (e.g., Octopus Go, Agile). With a battery, you can charge at night when rates are as low as 7–10p/kWh and discharge during peak hours when rates can exceed 30p/kWh.

This “tariff arbitrage” works alongside solar generation and can add another £150–£300/year in savings. Our Sigenergy and EcoFlow systems both support smart tariff integration.