Solar panels generate the most electricity in the middle of the day. Most households use the most electricity in the evening. That mismatch is the single biggest limit on what solar alone can save you, and it is exactly the problem battery storage solves. So is adding a battery worth the extra cost? Here is the honest picture.
The evening problem with solar-only systems
Without storage, a typical household uses only 30 to 50 percent of the electricity its panels generate. The rest is exported to the grid while you are out, then in the evening you buy electricity back at full price. The Smart Export Guarantee pays you for what you export, but export rates are a fraction of what you pay to import.
A battery captures that daytime surplus and holds it for the evening. Instead of selling cheap and buying dear, you use your own energy when you need it most.
How the savings compare
- Solar only: most North West homes save 600 to 1,200 pounds a year, using 30 to 50 percent of what they generate.
- Solar plus battery: combined systems cut electricity bills by up to 70 percent, because far more of your generation is used at home.
- Smart tariffs: a battery can also charge overnight on cheap off-peak rates and discharge during expensive peak hours, which keeps saving you money even in the darkest weeks of winter.
That last point matters in our climate. Generation is lower from November to February, but a battery on a time-of-use tariff keeps working all year. Our guide to solar performance in winter explains this in more detail.
What does battery storage cost?
Typical installed prices range from 2,500 to 4,000 pounds for a small battery (3 to 5 kWh), 4,000 to 6,500 pounds for the 5 to 10 kWh size that suits most 3-bed homes, and more for larger capacities. Crucially, battery storage installed with or alongside solar panels qualifies for 0% VAT, the same as the panels themselves.
A typical 3-bed home uses 8 to 10 kWh per day, and we usually recommend a battery that can store at least half your daily usage. During a free survey we analyse your energy data and size the battery to your household rather than selling a one-size-fits-all package.
A day with solar and battery storage
The easiest way to see the value is to follow the energy through a typical day:
- Morning: the panels wake with the daylight. The house runs on solar, and once the kettle and showers are done, the surplus starts filling the battery instead of draining to the grid.
- Midday: generation peaks while the house is quiet. The battery reaches full charge and any further surplus is exported for Smart Export Guarantee payments.
- Evening: cooking, heating, lights and television all draw from the battery rather than the grid, through the hours when electricity is most expensive.
- Overnight: on a time-of-use tariff, the battery can top up at the cheapest off-peak rate, ready to cover the morning peak before the sun takes over again.
The result is a household that buys very little peak-rate electricity at all, which is where the up to 70 percent bill reduction comes from.
Which battery brands do we install?
We work with the leading manufacturers and match the battery to your home and budget rather than pushing one brand. That includes GivEnergy, a popular UK-designed choice with excellent app monitoring, the Tesla Powerwall for premium whole-home capacity with backup power included, Fox ESS for cost-effective retrofits to existing solar, and SolarEdge for optimised systems on complex roofs. Whichever fits your home, warranties of 10 to 12 years are standard, and our battery storage page has a full guide to capacities and typical prices.
When a battery makes the most sense
- You are out during the day and use most of your electricity in the evenings
- You want maximum protection from rising energy prices
- You are on, or can switch to, a time-of-use tariff
- You drive, or plan to drive, an electric car and want to pair storage with home EV charging
And when solar alone might be the better start
Honesty matters more than an upsell. If you are home most of the day and already use most of your generation directly, or if your budget is better spent on a larger panel array first, starting with solar alone is a perfectly sound decision. Every system we install is battery-ready, so storage can be added later in around half a day, and it still qualifies for 0% VAT when added to an existing solar installation.
Common questions
How long do home batteries last?
Most home batteries carry manufacturer warranties of 10 to 12 years and are rated for thousands of charge cycles. A well-maintained system can keep performing for 15 years or more.
Will a battery power my home in a power cut?
It depends on the system. Some batteries include backup functionality as standard and others offer it as an add-on. If backup power matters to you, tell us at the survey stage and we will recommend the right setup.
Can I add a battery to panels I already own?
Yes, in most cases. We regularly retrofit batteries to existing solar installations across the North West, whether or not we fitted the original panels. We check your inverter compatibility and recommend either an AC-coupled battery or a hybrid inverter upgrade.
The verdict
For most households that are out during the day, solar with battery storage is worth it: the battery is what turns a good investment into the full 70 percent bill reduction, and 0% VAT makes the economics stronger than they have ever been. The right answer for your home comes down to your usage pattern, which is exactly what a free survey establishes.
Explore our battery storage systems and residential solar installations, or request a free survey and we will size both to your home.