When it comes to really utilising all the power your solar energy system can produce for you, you’re going to need a battery.
Storing the energy produced during the day means you can use it in the evenings and nights when, traditionally, the price of a kWh can be much higher if bought from an energy supplier.
Adding a battery to your system is not just a case of ‘plug in and save’ – some batteries are only compatible with certain systems, some will not hold enough power and some will just be, well, rubbish.
We’ve asked around the office and the techies have recommended us 10 great solar batteries that will help you save money for years to come.

Why do I need battery storage?

Because you will save WAY more money!

Your panels produce electricity whenever the daylight is hitting them, sometimes lots and sometimes a little.

If you are not storing that electricity during the day then it’s either being exported to the grid or being wasted.

Savvy electricity suppliers are now offering flexible tariffs so you can send energy to the grid when they need it most – which is usually the best time for you to send it.

You can only do this with battery storage.

Plus, you can charge your batteries from the grid during the night, when you will get a reduced rate on each kWh… if you find a tariff that allows that.


The capacity of a battery is measured in kilowatt hours, or kWh, much the same as the units on the electricity bill.

It refers to the amount of power a battery can store – and discharge.

The way batteries work is by storing electrical energy as chemical energy within a very delicately balanced collection of materials, including electrolytes and negatively charged semiconductors along with their positive counterparts.
Power comes from the inverter, and is absorbed by the battery as ‘potential energy’ and, when an appliance draws current from the battery, a reaction creates the electricity again and the appliance bursts into life.
The amount of material inside the batteries, and the mixing of materials, gives you the capacity.

The capacity written on the side of the battery is NOT always the capacity you get as discharging a battery to 0% can create a short circuit and cause damage.

Solar battery storage costs

When it comes to the cost of a solar battery, or a stack of solar batteries, the price will be dependent on the amount of storage you want.

A simple rule of thumb is: the more storage you have, the more expensive your battery, or batteries, will be.

Problem is, we can’t say 1kwh of storage with cost you ‘X’ amount of pounds.

Take for instance the Tesla Powerwall, which is currently able to store 13.5 kWh of usable energy, is around £5,400 as of July 2023.

While a Enphase AC Battery that stores 1.2kWh retails for around £2,500.

With the Tesla there will be a few quid added on for the name, but you can see how storage and price works.

Depth of Discharge

This metric alludes to the previous one as it is the amount of power you can draw from the battery before the battery management systems stop you.
Most batteries come with a depth of charge of around 94 – 96% but some modern batteries will allow a 100%.
If they can discharge to 100% it means the battery management is doing its work and the battery will start charging again as soon as it hits that 100%, which will draw power from the system… which is a bit of a waste.

Operating Temperature

Heat is a particularly important factor in the efficiency and longevity of a battery, with higher temperatures causing problems for the chemicals inside.
Different types of batteries can stand various kinds of extreme temperatures but, here in the UK, most batteries installed in solar systems are Lithium Ion.
Lithium Ion batteries can function between minus 20 and plus 60 Celsius but they are best kept at plus 10 to plus 30 Celsius.
So, as the UK has fairly temperate weather, your battery will be functioning well all year.

Lifespan of a Solar Battery

The lifespan of a battery is measured in how many cycles of charging and discharging it can handle before it starts to lose its ability to retain a charge.
For a standard Lithium-Ion battery, the charge cycles can be between 4000 and 6000 which, at 1 cycle a day, would be a lifespan of 10 – 15 years.
During the winter, your battery may charge and discharge twice a day.

So, what’s on the market?


BatteryPriceDimensionsWeightDepth of dischargeWarrantyStorage capacityUsable capacityMax power outputInstallation
Tesla Powerwall 2£7, 450Height 1,150mm x Width 753 x Depth 147mm114kg100%10 years13.5 kWh13.5 kWh5.0 kWStanding or Mounted
Alpha Smile 5 ESS 10.1£5,758Height 160mm x Width 610.5mm x Depth 236mm100kg90%10/3 years10.5 kWh96.1 kWh4.0 kWStanding
Puredrive PureStorage II£2,660Height 737mm x Width 737mm x Depth 387mm69kg90%10 years5 kWh4.5 kWh5.0 kWStanding or mounted
Moixa Smart Battery£4,450Height 345mm x Width 505mm x Depth 245mm80kg85%10/3 years4.8 kWh4.04 kWh850 WMounted
Greenlinx£2,500Height 484mm x Width 302mm x Depth 165mm34.9 kg100%10 years3.2 kWh3.2 kWh2.4 kWhMounted
Huawei Luna 2000 5kWh£2,700Height 960mm x Width 670mm x Depth 150mm63.8 kg100%10 years5 kWh5 kWh3.5 kWhStacked
SolaX Triple Power HV 11.6kWh£5,270Height 708mm x Width 474mm x Depth 193mm72.2 kg99%10 years11.6 kWh11.5 kWh4 kWhStacked
Generac PWRcell£14,600Height 1727mm x Width 559mm x Depth 254mm208 kg96%10 years9 – 34 kWh17.8 kWh11 kWhStacked – Standing
LG Chem Resu-10H£4,321.32Height 744mm x Width 744 mm x Depth 206mm97 kg96%10 years9.8 kWh8.8 kWh5 kWhMounted – Standing
Enphase AC Battery£2500Height 325mm x Width 390 mm x Depth 220mm23 kg96%10 years1.2 kWh1.15 kWh260 kWhMounted 

Tesla Powerwall 2 – £7, 450 (Average)

The Powerwall 2 is the second-generation hybrid battery from Tesla.
It has an immense amount of storage at 13.5 kWh, which is more than enough to run an average household for a day.
The system has all that storage, a built-in inverter and something called the Backup Gateway. This Gateway communicates with the Tesla app to tell you all about your energy usage.
You can stack power walls together for more storage but it may be a bit overkill.
Powerwalls will charge from either a PV array or from the grid – the app will control this.

DimensionsHeight 1,150mm x Width 753 x Depth 147mm
Depth of discharge100%
Storage capacity13.5 kWh
Usable capacity13.5 kWh
Max power output 5.0 kW
InstallationStanding or Mounted

Alpha Smile 5 ESS 10.1 – £5,758 (Average)

At around £7,500 for a storage of 9.1 kWh, the Alpha Smile5 Ess 10.1 is surprisingly good value for money.

That may be hard to believe at that price but if you compare it to the Encharge 10T, which stores 10 kWh of electricity and comes in at a cool £8,374, the Smile 5 looks pretty cheap.
It will happily work as part of many solar systems and is an exceptionally durable way to store your energy, lasting well over 10 years on average.
The only downer we can find on this battery is the weird small print that states the battery must be connected to the internet for the entirety of its 10 warranty or that warranty will drop to 3 years – and if the battery is disconnected from the ‘net for more than 20 minutes you must contact Alpha and let the, know.

Specification Value
Dimensions Height 160mm x Width 610.5mm x Depth 236mm
Weight 100kg
Depth of discharge 90%
Warranty 10/3 years
Storage capacity 10.5 kWh
Usable capacity 96.1 kWh
Max power output  4.0 kW
Installation Standing

Puredrive PureStorage II – £2,660

The price has dropped a fair amount for the Puredrive PureStorage, but it is probably more indicative of the kind of money people spend on their solar battery.
Buying an array of separate batteries, that are smaller and cheaper, maybe a better idea in the long run as you can replace them as they degrade and not have a huge layout of cash all at once.
Anyway, the Puredrive PureStorage works with most inverters, has an Integrated DC isolator, a whopping 10,000 cycles and is IP65 weather and waterproof.

It is worth noting that the warranty is only valid if the installer is Puredrive Certified.

DimensionsHeight 737mm x Width 737mm x Depth 387mm
Depth of discharge90%
Warranty10 years
Storage capacity5 kWh
Usable capacity4.5 kWh
Max power output5.0 kW
InstallationStanding or mounted

Moixa Smart Battery – £4,450

The Moixa Smart battery is very similar to other solar batteries, and let’s be honest there isn’t much difference in any of them, so to entice you in they have gone all out on the warranty. 

Most solar batteries come with a 10-year guarantee, and the Moixa is no different, but if you sign up for Moixa Gridshare they will extend that to a lifetime guarantee.
Yep, that battery is for life so long as Moixa are getting 50% of the cash for the electricity you export to the grid… so, you have to weigh up whether having a battery for life is better value than selling your energy to a normal supplier via SEG…. or if you want to sell it Moixa for that guarantee.

DimensionsHeight 345mm x Width 505mm x Depth 245mm
Depth of discharge85%
Warranty10/3 years
Storage capacity4.8 kWh
Usable capacity4.04 kWh
Max power output850 W

Greenlinx – £various

Greenlinx offer one of the most reliable batteries on the market today.
They are small, lightweight, and able to discharge 100% due to the excellent battery management storage.
They can be linked together to increase storage which, again, means you can save up for extra storage or replace one battery without having to lay out huge amounts of cash.
You can monitor each battery individually using the management system and they work well with the LuxPower Hybrid Inverter.

DimensionsHeight 484mm x Width 302mm x Depth 165mm
Weight34.9 kg
Depth of discharge100%
Warranty10 years
Storage capacity3.2 kWh
Usable capacity3.2 kWh
Max power output2.4 kWh

Huawei Luna 2000 5kWh- £2,700

The Luna 2000 is another modular system that allows you to build your storage up, or down, depending on your needs and budget.

The batteries stack on top of each other, they are 5kWh each, you can have 3 in one stack to create 15kWh of storage and linking 2 stacks together is possible.

It really is a very elegant solution and the batteries connect to a control module that communicates with the inverters and apps

DimensionsHeight 960mm x Width 670mm x Depth 150mm
Weight63.8 kg
Depth of discharge100%
Warranty10 years
Storage capacity5 kWh
Usable capacity5 kWh
Max power output3.5 kWh 

SolaX Triple Power HV 11.6kWh – £5,270

Solax offers another modular battery solution with their Triple Power HV.
Each 5.8kWh battery can be hooked up to 3 other batteries to give a whopping capacity of 23kWh!

Solax has also made their latest models much more tolerant to temperature changes, which makes them reliable in extreme weather.
The public is very happy with these batteries as they are getting rave reviews all over the internet.

We feel the modular systems will be the future of energy storage, as it allows customers to purchase, or replace, batteries as they have the funds.

DimensionsHeight 708mm x Width 474mm x Depth 193mm
Weight72.2 kg
Depth of discharge99%
Warranty10 years
Storage capacity11.6 kWh
Usable capacity11.5 kWh
Max power output4 kWh

Generac PWRcell – £14,60

You probably need a minute to get over that enormous price tag – but what is it you get for your money?

This is another scalable system, going up in 3 kWh to an eyewatering 34 kWh!
That’s pretty much total self-sufficiency from the grid if you have the panels to charge the system.

The 11 kWh is the one we are looking at for a start, that’s the biggest capacity of any single battery on this list, including industry leader Tesla.
Also, the Smart Management Modules help you to manage where your electricity is going, either the home or the grid.

DimensionsHeight 1727mm x Width 559mm x Depth 254mm
Weight208 kg
Depth of discharge96%
Warranty10 years
Storage capacity9 – 34 kWh
Usable capacity17.8 kWh
Max power output11 kWh
InstallationStacked – Standing

LG Chem Resu-10H – £4,321.32

LG is a name you can trust when it comes to electronics, and their battery storage solutions are no different.

They have been working on making the installation process much more simple by simplifying connectors and ensuring this battery is super lightweight.
The firmware for battery management can be updated using an SD card plus the battery fits a huge range of inverters and features the ‘World Best Energy Density’.

DimensionsHeight 744mm x Width 744 mm x Depth 206mm
Weight97 kg
Depth of discharge96%
Warranty10 years
Storage capacity9.8 kWh
Usable capacity8.8 kWh
Max power output5 kWh
InstallationMounted – Standing

Enphase AC Battery – £2500

Enphance offers entire systems including batteries, inverters and controllers, and their batteries are a fabulous solution for someone wishing to build their system as they use it.

They come in 1.2 kWh modules, which is by far the smallest amount of storage of any battery on this list.

You can start off with that kind of storage and, if you wish, add in another 13 batteries to get your system up to a cool 16.8 kWh – which is more than enough for a 5 bed, family home.
Of course, you have to have the panels to charge the battery, which is another brilliant aspect of this system as you can add batteries, and panels as you go along.

Another thing worth mentioning is the operating temperatures range from minus 20 to plus 45 degrees Celsius, so even if you live in the wilds of the Scottish Highlands, or just outside Penzance, your batteries are never going to fail you.

DimensionsHeight 325mm x Width 390 mm x Depth 220mm
Weight23 kg
Depth of discharge96%
Warranty10 years
Storage capacity1.2 kWh
Usable capacity1.15 kWh
Max power output260 kWh


As you can see, the variety and range of batteries is enormous, and we have only picked 10 from the 100s to choose from.
The type of battery you can use will very much depend on the system you have and how you will be using your electricity.
One thing we recommend is looking at the solar warranty, most are 10 years, but it is best to read the small print in case that decade comes with some pretty strict conditions.

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