What is home solar battery storage?

Watch video: Solar battery storage for home - EDF

In a nutshell, home battery storage, or a solar battery, allows you to store electricity for use at a later time. Many UK homes have solar PV panels which generate electricity during daylight. By adding a battery to the system, you can now use this energy in the evenings and:

  • Reduce your energy bills by using your own generation even when the sun sets
  • Save by charging on cheap overnight electricity and using the battery during the expensive hours, if you’re on a time of use tariff, such as Economy 7

And it’s good to know that when you add a battery to your solar PV any existing feed-in-tariff or Smart Export Guarantee payments are unaffected.

Why buy home battery storage from us?

We've teamed up with Powervault to link the home battery storage to EDF Grid Services. This means that as well as storing your solar energy for use later in the day, you can also support the UK's growth of renewables in the energy network by helping balance the grid. You can read more about Grid Services here. You don’t have to be an EDF feed-in tariff or energy customer to buy the solar battery from us. You could also choose to pay in monthly instalments and enjoy your solar battery from just £52.99 a month. Our price is all-inclusive:

Powervault solar battery being installed by Powervault installer
  • Battery with 10 year warranty
  • Standard installation, done in a day
  • EDF Grid Services
  • Powervault Portal to view your energy generation, storage and use in real time. 

What are EDF Grid Services?

Our Grid Services let you earn more from your solar battery. 

Being UK’s biggest generator of low-carbon electricity, we're working towards a low-carbon future. To become a Net Zero society we need to increase our renewable energy generation and reduce our carbon emissions. As renewable generation is intermittent, the energy system needs help to maintain the frequency and voltage balance. This is where batteries come in. As well as investing in large scale, low carbon generation and energy storage, we're building a network of small-scale batteries, which help balance the grid. We pay you an annual amount to occasionally use your battery.

Why choose a Powervault 3 for your home battery storage?

Our solar battery experts have specifically chosen the Powervault 3 battery. 

  • It comes with a built-in hybrid solar inverter which can replace your old one now or be ready for switch over when your original inverter fails, saving you the cost of a new one.

  • It's available in a wide range of capacities to suit your needs and it’s modular so you can add more capacity later.

  • It's compatible with all solar PV systems abd can be fitted to existing or new installations.

  • It's future-proofed – future functionality such as EV charging can be downloaded remotely so it continues to support your personal journey to net carbon zero.

How much does the Powervault 3 solar battery cost?

We offer two sizes of Powervault 3 which are suitable for most homes – 4kWh and 8kWh. If you were to buy 8kWh battery with Grid Services, you'd receive equivalent to £1000 off the price.

Limited Time Offer!

4kWh Powervault 3 + EDF Grid Services 
Was £5,599 Now £4,599

8kWh Powervault 3 + EDF Grid Services 
Was £7,999 Now £6,499


 With Grid Services
Battery capacity4kWh8kWh
Price inc. VAT£5,599£7,999
Discount offer£500£500
Upfront additional contribution for Grid Services reducing RRP£500£1,000
Total reduction from RRP£1,000£1,500
New RRP£4,599£6,499

It's possible to upgrade to larger systems, find out the prices in the T&Cs document. If you're unsure which battery size to choose, get in touch with one of our experts to help you out. 

Promotion ends 31st July 2021 - T&Cs apply

Ways you can pay for your solar battery

First, we'll need you to pay the £500 deposit. Once you've paid that, there are three ways to pay for your Powervault 3:

  • In full, prior to installation, by card
  • Spread the cost over 12 months with interest free credit(1)
  • Spread the cost over longer terms with competitive rate credit(1).

Review your payments and APR using our loans calculator

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Pay a £500 deposit by card or BACS.

See how much you’d pay monthly with finance for the balance

Select your preferred size battery and number of monthly payments below

This is for illustrative purposes only. Prices include standard installation. Some additional works may be needed. These will be identified during your survey and a full quote will be provided before you commit to purchase or taking out a loan. If you require additional works for installation, these can be included in your finance application also. All loans are subject to status and terms.

Loan summary

Cost of battery




Total cost of finance


APR Representative




Monthly Payment


Illustrations of spreading your costs over
12 months and 120 months

 4kWh battery with our 9.9% credit offer spread over 120 months4kWh battery with our 9.9% credit offer spread over 12 months
Price of battery£5,599£5,599
Additional upfront payment£500£500
Total reduction£1,000£1,000
Cash price£4,599£4,599
Remaining balance for payment£4,099£4,099
Duration of agreement120 months12 months
Monthly payments£52.99£341.58
Annual rate of interest (fixed)9.9% p.a.0% p.a
Representative APR9.9% APR0% APR
Total amount payable£6,357.60£4,099


 8kWh battery with our 9.9% credit offer spread over 120 months8kWh battery with our 0% credit offer spread over 12 months
Price of battery£7,999£7,999
Additional upfront payment£1,000£1,000
Total reduction£1,500£1,500
Cash price£6,499£6,499
Remaining balance for payment£5,999£5,999
Duration of agreement120 months12 months
Monthly payments£77.55£499.92
Annual rate of interest (fixed)9.9% p.a.0% p.a.
Representative APR9.9% APR0% APR
Total amount payable£9,306£5,999


How much could I save with the Powervault 3?

The savings will depend on many things such as the size of your PV system and your home's energy use. The solar battery system is very flexible and you can set a schedule to suit your energy use pattern. As an example, this illustration shows a four-bedroom family house in South East England, with a south-facing 2.4kWp solar PV system, 4kWh Powervault 3 battery, and an E7 electricity tariff. 

Solar battery saving graph - Powervault

Day 1 - The house is powered by solar generation during the day any excess is used to fill the battery first. Any remaining energy is then exported to the grid. The house then runs off the battery in the evening. On this particular day, it used its own electricity until 3am, when it switched to the grid. 

Day 2 - The battery is topped up with one hour of cheap overnight grid electricity, which is then used to power the house in the morning instead of using peak rate electricity from the grid. During the day the house runs off the solar, putting any excess into the battery, which is then used in the evening. 


Need help? Contact us

If you're not sure which option is best for you, we'll be more than happy to discuss your requirements and guide you through the process. Our Tech Team are very knowledgeable and will help you decide. Head to our help and advice section to learn more and contact one of our experts via our online form if you need more guidance.

More technical information

There's a lot more information about our Powervault 3 home battery storage, including dimensions and weight. You can also read more about Grid Services

Battery storage for your business

Businesses can generate additional revenues from energy flexibility services. If you install a commercial scale storage system, your business could save money by shifting energy use from high cost to low cost periods.