Battery Storage Without Solar

Is it worth it?

Short answer: Yes, if you're on the right tariff. A home battery bought on its own, without any solar panels, saves you money by charging overnight at 3 to 7p per kWh on a time-of-use tariff and then powering your home at peak times when grid electricity can cost 24 to 28p per kWh. On a typical 3–4 bedroom home, that gap is usually worth £400 to £800 a year, with payback landing somewhere between 6 and 12 years depending on battery size, usage pattern and tariff.

No roof space. No scaffolding. No planning questions about which way your roof faces. Just a battery, an inverter, and a smarter relationship with the electricity you're already buying. Here's what that actually looks like, and the maths behind it.

What is “battery storage without solar”, exactly?

A standalone battery, sometimes called an AC-coupled battery, connects to your consumer unit rather than to solar panels. Its job is simple: charge from the grid during a cheap overnight window, then discharge to run your home through the rest of the day, particularly the expensive evening peak between roughly 4pm and 7pm.

This is different from a solar-plus-battery system, where the battery mainly stores surplus solar generation you'd otherwise export for pennies. Without solar, the battery has one job: arbitrage. Buy electricity when it's cheap, use it when it would otherwise be expensive.

It's a genuine option for households that can't fit solar, don't want the roof work, are in a flat or rented property, or simply want to cut bills now and add panels later.

How the savings actually work

The whole strategy depends on the gap between two numbers: your off-peak rate and your peak (or standard) rate. In 2026, the widest gaps look like this:

A battery only makes sense once you're on a time-of-use tariff. On a flat, single-rate tariff there's no cheap window to fill, and you'll actually lose a little money once you account for the 10 to 15% of energy lost charging and discharging the battery. Switching tariff is the first step, and it costs nothing.

A worked example

Take a household using around 3,500 kWh a year, with 3,000 kWh of that shiftable to peak/daytime use and the rest genuinely overnight (fridge, standby devices).

That's before real-world losses like winter days where a modest battery can't hold a full day's usage, or evenings where you draw more than the battery can supply in one go. A sensible, conservative estimate for most homes is £400 to £700 a year in genuine savings, not the headline figure from a best-case calculator.

Fit Solar standalone battery prices, 2026

These are our current standalone battery packages, installed with no solar panels required. Every package includes an inverter with a 10 year warranty and MCS accredited installation.

All three come with an IP65 rating, so they're suitable for indoor or outdoor installation. A few things worth knowing before you get a quote:

• 0% VAT applies. Standalone battery installations, with or without solar, qualify for 0% VAT on energy-saving materials until 31 March 2027. This is already reflected in the prices above.
• A smart meter is essential. Time-of-use tariffs won't work without one, so factor in getting one fitted if you don't already have one.
• Sizing matters more than headline capacity. The 9.5kW package is our most popular for a reason, it comfortably covers a typical household's shiftable daytime and evening usage without paying for capacity that sits unused.

The other benefit: power when the grid goes down

Bill savings are the main reason to buy a standalone battery, but resilience is becoming a bigger part of the conversation too. On average, a UK home loses power for around 38 minutes a year, but that figure hides how uneven outages really are: storms can knock out power to tens or hundreds of thousands of homes at once, and rural, storm-exposed areas see outages far more often than the national average suggests.

Worth knowing before you assume a battery covers you automatically: a standard grid-tied battery is required by UK electrical regulations to shut down the moment the grid fails. That's a safety feature, not a fault, it stops your home quietly feeding power back down a line that engineers may be working on. To keep the lights, fridge and internet running through a power cut, the system needs a specific backup or Emergency Power Supply (EPS) function, wired in at installation rather than added afterwards.

It's a straightforward thing to ask for. If resilience during a power cut matters to you as much as the savings, tell your installer upfront so backup capability is designed into the system from day one rather than treated as an afterthought.

The scale of what a major outage can mean became clear last year, when a huge power failure left Spain and Portugal without electricity for hours in April 2025. BBC News reported that the disruption pushed businesses across the region to invest heavily in battery backup afterwards, with Spain's battery storage capacity climbing nearly sevenfold in the year that followed. That's an industrial-scale response to an extreme event, and nothing on that scale is expected in the UK, but the same principle applies at home: a battery with backup capability turns a stressful few hours in the dark into a non-event.

Who a standalone battery genuinely suits

Likely a good fit

• Roof can't take solar, whether that's shading, orientation, a flat roof, or a conservation restriction
• Renters and leaseholders who can't alter the roof
• Homes with high, predictable daytime and evening usage, such as home offices, families home during the day, or an EV on top of normal usage
• Anyone who wants backup power during a cut, provided EPS is specified at installation
• Households planning to add solar in a year or two, buying the battery first

Worth holding off

• Daytime and evening usage is already low
• Not prepared to switch to a time-of-use tariff
• Roof is well suited to solar and it hasn't been ruled out, pairing both from the outset usually returns more

Choosing the right size

Bigger isn't automatically better. A battery sized well above your daily shiftable usage just means capacity you're not using, sat there depreciating. The sizing question comes down to two numbers: how many kWh you typically use between the end of your cheap window and the start of the next one, and how many of those kWh happen at the highest-priced part of the day. A proper survey, rather than a generic size recommendation, is the difference between a battery that pays for itself and one that quietly underperforms for a decade.