Why Solar Battery Storage Matters Now – for Carterton & Oxfordshire Homes

5 reasons battery storage matters now

1. Electricity prices are going up again

Ofgem raised the energy price cap by 4% from 1 October 2026, taking a typical dual-fuel bill to £1,723 a year. The House of Commons Library reports a further rise of around 9% is forecast for January–March 2027. A battery shifts more of your usage onto cheap rates, so each rise hurts less.

2. The cheap-rate gap has never been wider

Smart tariffs now offer overnight electricity at around 8p per kWh – roughly a third of the standard capped rate. Every kWh your battery charges overnight and uses at teatime saves about 18p. That adds up fast in a busy household.

3. Selling solar back pays far less than buying it

If you already have solar, flat export rates in 2026 sit around 12–15p per kWh. Buying the same electricity back in the evening costs around 26p. Storing your midday surplus and using it after dark is usually worth roughly double what exporting it earns.

4. 0% VAT ends on 31 March 2027

Batteries are zero-rated for VAT – whether fitted with solar or on their own (standalone batteries have qualified since February 2024). From 1 April 2027 the rate is due to rise to 5%, and the government has not said it will extend the relief.

5. Winter is when a battery works hardest

Solar output drops in winter, but a battery keeps earning by charging overnight on a cheap tariff. That makes it a year-round saving, not just a summer one.

How a home battery saves you money

There are three common setups:

• Solar + battery – panels charge the battery during the day; your home runs on stored power in the evening instead of buying from the grid.
• Battery only – no panels needed. The battery charges overnight on a cheap tariff and powers your home through the expensive peak. Ideal if your roof isn't suitable for solar (see our roof suitability guide).
• Battery + EV – the car charges overnight at the cheap rate, while the battery covers your home's daytime and evening use. See picking the best EV charger.

What size battery do you need?

Bigger isn't always better. The right size is the one you'll actually fill and empty most days.

A useful rule of thumb with solar is roughly 1kWh of storage for every 1kW of panels – but we size from your actual usage, not guesswork.

Costs and savings in 2026

Published UK guides put most installed home batteries between about £3,000 and £10,000, with a typical 10kWh system around £5,000–£8,500. The price depends on the brand, whether you need a new hybrid inverter, backup features and how far the battery sits from your fuse board.

Is a battery right for your home?

A battery usually makes sense if:

• You already have solar and export a lot in summer
• You use a lot of electricity in the evening
• You have (or plan to get) an EV or heat pump
• You can switch to a time-of-use or EV tariff
• You want some protection against future price rises

It may be worth waiting if:

• Your electricity use is very low
• You're planning to move in the next couple of years
• Your consumer unit needs replacing anyway – do that first (we can quote both together)

Battery storage around Carterton, Witney & the Cotswolds

Every patch has its own reasons to go for a battery:

• Newer homes in Carterton, Witney and Eynsham often already have a small solar array fitted by the builder – a retrofit battery is the quickest win.
• Rural properties around Burford, Charlbury and Chipping Norton are often off the gas grid, with higher electricity use and more exposure to power cuts – worth specifying a battery with backup.
• Terraces in Oxford and Abingdon with limited roof space can still save with a battery-only setup on an overnight tariff.

We fit batteries where the manufacturer's guidance allows – usually a garage, utility room or external wall – and always wire them neatly back to your consumer unit.

Frequently asked questions