Solar Battery Cost & Savings in the UK
Battery storage has become an essential part of any solar panel installation, but how much does a solar battery cost and are solar batteries worth it for you ?
Average Battery Cost in the UK (2026)
Solar battery systems in the UK typically cost between £2,000 and £6,000+, depending on capacity, installation complexity and whether backup power is included.
For many UK households, adding a battery increases self-consumption and reduces grid costs — especially when paired with time-of-use tariffs or EV charging.
Want a tailored estimate? Try our Solar Quote Calculator to compare costs with and without battery storage.
For most households, adding battery storage makes a lot of sense. A home battery can improve energy independence and help maximise your energy bill savings – especially if you use time-of-use tariffs.
This table provides a guide on the average solar battery cost in the UK for various-sized batteries.
| Battery Size (kWh) | Typical Installed Cost (UK) |
|---|---|
| 5 kWh | £2,000 – £3,000 |
| 8–10 kWh | £3,000 – £5,000 |
| 12–15 kWh | £5,000 – £7,000+ |
These system prices assume a mid-range system with all the panels installed on a single roof orientation. If you have a more complex layout, want a high-end system, or require additional electrical or roof work then you will likely need to pay more.
What affects solar battery cost?
Several factors determine the price of a solar battery and how much a battery costs to install in the UK. Below, we will look at each aspect in more detail so that you know what to expect to pay.
- Battery capacity (kWh)
- Battery chemistry
- Inverter compatibility
- Installation complexity
- Backup functionality
Usable Vs Total Battery Capacity
The higher the capacity of your battery, the more it will cost. This is fairly simple, but one of the most important factors to look at when picking a battery is whether it’s advertising its usable or total capacity.
The usable capacity is what really matters to you, so make sure that you are checking for that! Any additional capacity in the battery is put there by the manufacturer to aid in battery longevity and health, but it can’t be used by your system.
Battery Chemistry
Now, basically, all home batteries on the market use similar Lithium Iron Phosphate (LiFePO4) chemistry, so for most installations, we can ignore chemistry. If you are looking for a cheaper and often less safe option, you can explore other options like lead-acid, but most installers won’t be interested in helping you.
Lithium Iron Phosphate batteries are relatively cheap, but bulky due to their lower energy density than Nickel Manganese Cobalt, which was used in the old Tesla Powerwall 2.
How your inverter affects battery cost
All batteries do the same thing, storing energy for use later, but how much control you have of this will affect the cost of your solar battery. This control isn’t determined by the battery itself, but by the inverter it is connected to.
A battery system with additional smart controls and integrations will typically cost you more; however, they might make your user experience better and unlock additional avenues to savings. We generally don’t recommend mixing battery and inverter brands, as you can lose some of the functionality and compatibility. So if you have a more expensive inverter brand, you will likely face a higher solar battery price.
Labour cost
How much your solar battery costs to install will be affected by whether you are connecting your battery as a standalone system or as an addition to a hybrid inverter.
An AC-coupled battery requires its own inverter to turn AC electricity into DC to be stored in your battery. This additional inverter can often be integrated into a single unit with the battery, like in the old Tesla Powerwall 2 or GivEnergy AIO. This additional inverter will increase the overall cost of battery installation. When you are adding a battery via a hybrid inverter, you are using the same inverter as your solar panels, so this setup typically costs less as less wiring is required.
Additional electrical costs
Battery Backup Capabilities
For a whole-home backup, you will typically need a gateway device that controls your changeover and acts as your islanding device, but not all inverter manufacturers offer these. Both types of systems require a fair bit of electrical work to be compliant, so the cost of this needs to be factored in. You can expect to pay £300 – £500 for a backup gateway alone, with the cost of the additional wiring on top.
Solar Battery Cost vs Savings
Without a battery, many UK households export 40–60% of the electricity they generate. With a battery, self-consumption can increase to 70–85%, reducing reliance on peak-rate grid electricity. A solar battery stores the excess solar generation produced during the day for use later when demand is higher than solar generation.
How increased self-consumption increases savings
Solar batteries are a great investment for most homes in the UK, considering a solar panel system. A home battery can improve energy independence and help maximise your energy bill savings by increasing the amount of solar generation you use. By using more of what your solar panels produce, you reduce the amount of electricity that you buy from the grid. Current UK Energy prices are capped at around 28p/kWh, whereas the best export rates are around 15p/kWh. To put it simply, its better to save 28p than it is to earn 15p.
How much does a solar battery save an average home?
Below, we have modelled how a solar battery affects the solar installation of an average UK home. We have kept the solar PV system the same, given them access to the same energy tariff and kept their energy usage in line with most UK homes. Note that we have used 12p/kWh export as this is a rate that you can get no matter your energy supplier. If you want to learn more about how we calculate these savings, we explain in full here.
UK Home - Just Solar
the home:
Annual energy usage: 3500 kWh
Usage pattern: Out all day
Import tariff rate: 28p
Export tariff rate: 12p
the solar PV:
System size: 4.6kWp (10 panels)
Roof: South-facing (unshaded)
Solar Battery: No Battery
System Cost: £5100
Annual System Performance:
Generation: 4278 kWh
Self-consumption: 1251 kWh (29%)
Total Export: 3’037 kWh
Grid Import: 2’260 kWh
Key Financial Stats:
Projected Payback: 6.0 yrs
Lifetime net savings: £31’675
1st year bill saving: 59%
Annual savings: £712
UK Home - Solar & Battery
the home:
Annual energy usage: 3500 kWh
Usage pattern: Out all day
Import tariff rate: 28p
Export tariff rate: 12p
the solar PV:
System size: 4.6kWp (10 panels)
Roof: South-facing (unshaded)
Solar Battery: 8 kWh
System Cost: £7500
Annual System Performance:
Generation: 4278 kWh
Self-consumption: 2684 kWh (63%)
Total Export: 1449 kWh
Grid Import: 826 kWh
Key Financial Stats:
Projected Payback: 6.9 yrs
Lifetime net savings: £39,863
1st year bill saving: 77%
Annual savings: £922
In Summary
The comparison above shows a couple of key things. Firstly, the solar battery increases self-consumption from 30% to 63%. This results in the first-year annual bill savings increasing from £712 without a battery to £922 with a battery. The additional cost of the solar battery leads to an increased up-front cost; however, the lifetime net savings are also much higher. The £7500 solar and battery system saves this UK homeowner an additional £8200 over the system’s lifetime. We do see that the higher up-front cost does add a year to the pay-back period.
These additional savings might be what you are looking for, but the benefit of a solar battery isn’t just an increased self-consumption. Try our Solar Quote Calculator to see how time-of-use tariffs work with a solar battery to increase your savings.
Battery Vs No Battery comparison
There are a lot of practical differences between a solar PV system with and without a solar battery. Here, we will look at how including battery storage affects the installation, complexity, price and behaviour of your solar panel system.
Solar without a Battery
Lower Upfront cost
If you are looking for a cheaper system, then avoiding a solar battery is a great way to do this. You will save £2000 – £6000.
Higher exports
Without a battery, you will be exporting more of what your solar panels produce. You will want to prioritise a high export rate tariff.
Simpler installation
Fewer places around your home are suitable for a solar battery than a standalone inverter. This can mean that the installation can be less complicated and the components can be placed out of the way. Check out PAS:63100 for more information.
Simpler system
Without a solar battery, your system becomes very easy to understand. This can be a benefit for those who don’t want to worry about optimisation.
No Backup
No battery means no backup. For most UK homeowners, this isn’t an issue, but changes to our energy security might change that.
Solar with a Battery
Higher Upfront cost
Solar batteries still have a high up-front cost. This can mean a longer payback period than a system with only solar panels.
Higher Self-consumption
Having battery storage will increase the solar self-consumption of most UK homes. Being able to use more of what you produce will increases your annual bill savings.
Complicated installation
Battery storage should only be installed in certain locations. This can complicate your installation. You also need to consider how you would want to connect your battery to your system.
More tariff flexibility
Having a solar battery unlocks a world of possibilities with time-of-use tariffs. Utilising these correctly can hugely increase your energy bill savings. Staying on top of optimising your system for them can be difficult for most UK homeowners.
Full or Partial Home backup
A battery system is the first step in increasing your energy independence. Being able to keep the power on during outages is always a nice thing to have.
Who benefits most from battery storage?
While a solar battery is great for improving the energy independence and bill savings of most homes, it is especially good for some. If your home has one of these, then a solar battery becomes an even easier choice.
- High evening usage
- High annual electricity demand
- Access to time-of-use tariffs (especially EV tariffs)
- Space for a large solar PV system
Homes with high annual usage, especially when it’s mainly in the evening, can benefit greatly from storing solar generation during the day for use later. While homes with time-of-use tariffs, especially the tariffs available to Electric Vehicle owners, can maximise their solar batteries’ financial benefit.
How does a Battery Affect your Payback period?
Rather than relying on national averages, you can use our Solar Quote Calculator to see how different-sized batteries affect your bill savings!
It takes less than 2 minutes and allows you to model a bespoke system for your home. We use real weather data in your area, MCS-style calculation, and you can even see how different energy tariffs affect your savings.