Powervault 3 solar battery technical specification
Powervault 3 home battery storage is designed and assembled in the UK. It's been designed specifically to store solar energy or off-peak electricity in either residential or commercial premises. It’s compatible with all solar systems and is quick and easy to install. It comes with a hybrid solar inverter, which can replace your old one now or be ready for switch over when your old one fails, saving you the replacement cost of that too. You can view and download the full specifications here.
Battery type and chemistry | Lithium-polymer (Li-MNC) | |
Usable capacities | 4.1kWh | 8.2kWh |
Usable inverter rating | 4.6kW | 5.5kW |
Available with EDF Energy grid services | ![]() | ![]() |
Dimensions | H: 90cm; W: 98cm; D: 25cm An additional 10cm is required on all sides for access | H: 120cm; W: 98cm; D: 25cm An additional 10cm is required on all sides for access |
Weight | 129kg | 179kg |
Warranty | 10 years |
Need more help? Contact us
If you're not sure which option is best for you, or would like to talk through the technical information in more detail, 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. They're a busy team so to save you waiting on the phone, please fill out the contact form below, including best day and time to contact you and they'll give you a shout!
Installation
Installation of your Powervault 3 home solar battery is included as part of the package we offer. The Powervault 3 can be installed in most internal locations, such as garage, utility room, basement or under the stairs. It's not suitable for external locations and we don't recommend installing it in loft spaces. Powervault 3 will be floor mounted and fixed to the wall for stability. It'll need to be connected to the internet at all times. As part of the pre-installation process we'll ask you for measurements and photos of the proposed location and of the fuse box.
The Standard Installation covers all the work we need to do for the average domestic installation. For more complex installations or those in more geographically remote locations we charge the additional costs as detailed in the Installation section of the Ts&Cs.
Go to our Frequently Asked Questions for more information.
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EDF Energy grid services
What are EDF Energy grid services?
Right now, when the electricity grid runs short of capacity during peak periods, extra power can be generated but usually not in the cleanest or greenest way. Conversely, when there’s excess renewable generation, demand cannot be increased which leads to wasted energy. That’s why EDF Energy is building a network of small-scale batteries to help balance this mismatch. In return for helping balance the grid for 10 years, we’re offering a substantial upfront discount off the retail price of the battery. You can also purchase Powervault at full retail price and opt out of the grid services.

Paying for your solar battery
There are 2 ways to pay for your Powervault 3:
- In full, prior to installation;
- You can spread the cost over a longer term with our personal loan option(1).
The personal loan includes:
- Flexible terms - borrow between £3,000 and £10,000, over one to five years;
- 6.9% APR representative for loans between £5,000 and £7,499 and 8.9% APR representative for loans between £3,000 and £4,999;
- Use your loan to cover part or all of the battery cost, additional installation works or other home improvements;
- Instant decision - we'll tell you straight away if we can offer you a loan;
- Know what you're paying each month, overpay if you want and there are no set up costs or hidden charges.
As an example, £3,000 over 36 months would be £61.63 per month (8.9% APR representative), total amount repayable would be £3,697.80