Battery storage
The battery is the decision that changes all the others.
Store cheap power and your own solar for the expensive hours. The Hinen B15 stores a kWh for less than any other single battery we fit: £5,000 installed, with or without solar.
Get my free quote
Three details. We call or text within one working day to book your free 30-minute design call, on video or by phone if you prefer.
or call 07782 219224
- Free 30-minute video design call
- Hinen B15 at £5,000, 8.3p per kWh stored
- Powerwall 3 from £6,350
- Free 30-minute video call
- 10-year Powerwall warranty
- Our MCS-certified, fully insured teams
Installed prices, compared
Six batteries, compared honestly
Three manufacturers, six packages, every price installed. The cheapest box is not always the cheapest way to store power: what a battery costs per kWh it stores across its warranty is the number that compares them fairly.
Lowest cost per kWh stored
Fill and empty a battery once a day for its whole warranty and the two Hinen packages cost 8.2p and 8.3p per kWh stored, the lowest of the six. Duracell works out at 8.5p and Tesla 11.0p to 12.9p. Hinen's 12-year warranty does a lot of that work.
A battery with no panels
With no new panels, the Hinen packages are the lowest installed price per usable kWh we offer: £358 for two and £365 for one, against £402 to £470 for the Powerwall 3. The Hinen B15 (£5,000) and the Tesla Powerwall 3 (from £6,350) are sold with or without solar. The Duracell packages are priced for an installation alongside solar panels.
Adding panels at the same time
All six packages fit alongside new LONGi panels. With panels going in, a Dura16 is £4,450, or £309 per usable kWh on a 10-year warranty. Size it to your evening use; your design call works that out from your bills.
 Hinen B15One unit13.68 kWh |
 Two Hinen B15Two units27.36 kWh |
 Duracell Dura16One unit14.4 kWh |
 Two Duracell Dura16Two units28.8 kWh |
 Tesla Powerwall 3One unit13.5 kWh |
 Powerwall 3 + ExpansionTwo units27 kWh |
|
|---|---|---|---|---|---|---|
| Installed price | £5,000 | £9,800 | £4,450 | £8,900 | from £6,350 | from £10,850 |
| Per kWh stored | 8.3p | 8.2pLowest | 8.5p | 8.5p | 12.9p | 11.0p |
| Per usable kWh | £365 | £358 | £309 | £309 | £470 | £402 |
| Usable storage | 13.68 kWh | 27.36 kWh | 14.4 kWh | 28.8 kWh | 13.5 kWh | 27 kWh |
| Warranty | 12 years | 12 years | 10 years | 10 years | 10 years | 10 years |
| Backup | Whole-home with the SmartBox gateway | Whole-home with the SmartBox gateway | Discussed on your call | Discussed on your call | Requires a Backup Gateway 2 | Requires a Backup Gateway 2 |
| Sold | With or without solar | With or without solar | With solar | With solar | With or without solar | With or without solar |
| See the B15 | See two B15 | See the Dura16 | See two units | See the Powerwall 3 | See the Expansion |
Per kWh stored is the installed package price divided by everything the battery can store if it fills and empties once a day for its whole manufacturer warranty; per usable kWh is the price divided by the datasheet usable capacity alone. Both are arithmetic on the prices above, not manufacturer figures.
What it could be worth to a typical home
Pays back in 7.6 years
Pays back in 9.5 years
Pays back in 11.2 years
Estimated year-one benefit on the model every calculator on this site runs: 12 LONGi panels (6.36 kWp), a home using 2,700 kWh a year, 925 kWh per kWp (the average PVGIS yield across our county pages), a 12p export rate and off-peak charging at 8.5p. A bigger battery earns its keep in a home that uses more, or runs an EV or a heat pump. Run it for your own spend.
What would storage do for your bills?
Pick a battery, tell us where solar fits in, and see the numbers for your own area. Nothing is sent anywhere and no email is needed to see the result.
Hinen B15
Your real roof, your real usage, on a free video call. No obligation, and no home visit needed.
Get these numbers checked for your roof
Three details. We call or text within one working day to book your free 30-minute video design call, and your calculator settings come with you.
Why batteries earn their place
Three jobs, one box
A home battery does three things, and the best designs use all three.
It stores your solar. Generation peaks at midday; usage peaks in the evening. The battery moves your own energy across that gap instead of selling it cheap and buying it back dear.
It buys off-peak. Smart tariffs offer cheap overnight windows. The battery fills up at the low rate and runs your home through the expensive hours.
It can unlock better export rates. Some suppliers reserve their strongest export rates for homes with solar and a battery installed together; our export rates page names them and the conditions.
Sizing honestly
Size the battery to your evenings, not to the biggest box on the shelf
The right capacity comes from how much electricity your home uses between sunset and sunrise, not from the roof. Oversizing wastes money on capacity you never cycle; undersizing leaves you buying peak-rate power with a battery on the wall. Your design call works it out from your actual usage.
How it works
Four steps to switch-on
You see the design and the price before anyone visits, and nothing is booked until you say so.
- 2 minutes
Tell us about your home
Your postcode, your first name and a number to call. The rest can wait for the call.
- 30 minutes
Free video design call
Niall or Vince, our residential energy consultants, look at your roof and your usage with you.
- When you are ready
Survey and written quote
A home survey confirms the design at your property and your written quote follows.
- Install day
Install and switch-on
Our MCS-certified, fully insured installation teams fit and commission it, and your MCS certificate follows.
Every installation is carried out by our teams, who hold:
See a number before you speak to anyone
Answer a few questions about your roof and usage and see an instant solar and battery estimate. No email needed to see the result.
Go deeper
Read before you decide
Inside a home battery: capacity, power and losses
Usable capacity, kW output, round trip losses and chemistry, in plain terms.
Read the guideWhich battery size band does your home fall into?
Where UK homes actually land, why oversizing costs you, and what shifts the band.
Read the guideTesla Powerwall 3 vs Duracell Dura16: which fits your home?
The two packages we actually price, compared on the numbers that decide it.
Read the guideDoes a standalone battery actually pay back?
No panels means one job: buy cheap, use later. The tariff decides whether it pays.
Read the guideAdding a battery to solar panels you already own
Retrofitting a battery to working solar is straightforward. The paperwork is where people trip up.
Read the guideHow much a battery saves by charging on cheap night rates
What charging at 8.5p and using at 26.32p is actually worth over a year.
Read the guide
Home battery questions, answered
Which home battery is the best value?
Measured by what it costs to store each kWh, the Hinen B15. Fill and empty it once a day for its 12-year warranty and two B15 cost 8.2p per kWh stored and one 8.3p, against 8.5p for the Duracell packages and 11.0p to 12.9p for the Powerwall 3 packages. On installed price per usable kWh alone, the Duracell packages come lowest at £309, but only when fitted with new solar panels; on a battery-only install the Hinen packages are lowest, at £358 for two and £365 for one. Value also depends on what you need: the Powerwall 3 has its inverter built in, and the right size comes from your evening usage.
Do I need solar panels to benefit from a battery?
No. A battery on its own can charge from cheap off-peak electricity and run your home through peak hours. Solar makes the case stronger, but tariff-only batteries are a real and growing setup.
Will a battery power my home in a power cut?
Only if it is specified with backup capability, which not all systems include as standard. On the Powerwall 3 that needs a Backup Gateway 2, and on the Hinen B15 the free SmartBox gateway is what makes the backup whole-home. If backup matters to you, say so on the design call and the design will account for it.
How long do home batteries last?
The Tesla Powerwall 3 and the Duracell Dura16 both carry a 10-year manufacturer warranty on their datasheets, and the Powerwall 3 is warranted to keep 80 per cent of its capacity at 10 years. The Hinen B15 carries 12 years, subject to Hinen’s warranty terms. Your written quote sets out the exact warranty for the hardware in your design.
Can I add a battery to existing solar panels?
Usually yes, either AC-coupled alongside your existing inverter or as part of a wider upgrade. It is one of the most common jobs we do, and the design call establishes which route fits your system.
Get my free quote
Takes about two minutes. We call or text within one working day to book your free 30-minute video design call at a time that suits you. We design it around your roof and your numbers, and our MCS-certified, fully insured installation teams install it.