Your Powervault solar battery questions answered

Who can I talk to about technical details?

Our Tech Team are on hand to talk through technical details and answer your questions. They’re a busy team so to save you time, fill in this short form and they will call you back at a time to suit you.

Does installing a battery affect my Feed-in Tariff or Smart Export Guarantee payments?

If you're on a Feed-in Tariff (FiT) scheme, you should continue to receive your payments in full. If you're on a Smart Export Guarantee, you may continue to receive your payments in full but this can vary from one provider to another. In both cases, it's best to check with your FiT/SEG provider. 

I don’t have solar PV, can I have a battery?

Yes, although it will take you a lot longer to pay back if you’re not storing solar generation. If you’re thinking about installing solar PV and want a battery too, talk to our Tech Team so we can liaise with your solar installer.

Who will install my battery and how long does it take?

Powervault 3 expert installers will do all the work. A standard installation usually takes a few hours. If you have specific needs then our experts will discuss these with you and if there are any additional works required they will confirm the cost ahead of final payment.

What’s a suitable location for the Powervault 3?

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 installation in loft spaces. Powervault 3 will be floor mounted and fixed to the wall for stability. The physical dimensions are listed in the technical specification. An additional 20cm is required on all sides for access and ventilation. Your Powervault 3 will need to be connected to the internet at all times. See the Standard Installation section of the Ts&Cs for more details.

Will I see any change to my energy bill?

If you currently export excess solar generation you will be able to store this for use later when the sun is not shining. This in turn will reduce the amount of energy you draw from the grid and, therefore, reduce your electricity bill. If you have Economy7 tariff, you can charge up your Powervault 3 on cheap overnight rate electricity and use it during the higher rate hours. How much you save on your energy bill will depend on your individual solar PV system and energy usage pattern.

Do I get a reduced rate of VAT for a solar battery?

No. Batteries by themselves are not eligible for reduced rate of VAT. If you are installing solar PV at the same time, talk to our Tech Team. They can liaise with your installer to apply the reduced rate for the combined system if you qualify. 

What's included in the standard installation package?

Full details of what’s included are listed in the Charges & Installation section of the Ts&Cs. Installation is available in mainland UK and Isle of Wight. We currently don't install in Scottish Highlands and Islands, Northern Ireland, Channel Island, Isle of Man or Isles of Scilly. 

For deliveries to more remote locations, or more complicated installations we'll pass on the additional costs we incur. You can see more details in the Installation section of the Ts&Cs. 

Will you need to do a survey to see if my home is suitable?

The Tech Team will ask you some questions and you will need to provide some photographs of the area where you'd like your Powervault 3 to be fitted. In most cases we send an engineer to visit your home and check all the finer details before you commit to an installation. We don't charge for this visit. If additional work is required, that's outside the Standard Installation package, we'll quote you before you commit to the installation.

What are the dimensions of the batteries?

The 4kWh battery is: H97cm x W100cm x D25cm.

And the 8kWh battery is: H127cm x W100cm x D25cm.

An additional 20cm is required on all sides for access and ventilation.

Do I have to replace my existing inverter now?

No. The Powervault 3 can be installed in different configurations either replacing your old inverter now, or leaving the new one ready for when your old one fails. Switching to the new inverter later will involve a small amount of work from a qualified electrician (and associated cost), but save you the cost of the new inverter later. Our Tech Team will talk you through the options.

I’m not currently on a E7 meter or tariff, can I switch?

You need to talk to your energy supplier as there are regulations about switching to E7 meters. Even if you are not on E7, you should still be able to make substantial savings by storing your solar generation for use later in the day.

I have a smart meter, does this have any impact on installation of a battery?

Having a smart meter doesn’t have any impact on the installation of the battery itself. OFGEM have also confirmed that customers with solar PV + battery + smart meter would receive deemed export feed-in-tariff payments. They are in the process of updating their published guidance on this matter. Talk to your feed-in-tariff provider if you have more questions about this matter.

Can I have a battery installed if I have a wind turbine?

Yes. Talk to our Tech Team about your specific requirements.

I have a solar diverter that heats my hot water; can I have a Powervault installed?

Unfortunately not, but we’re working on a solution for this.

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. 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!

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

Talk to an expert

If you have any other questions about Powervault 3 or installation requirements, please complete the call-back form below and our Tech Team will call you back. Please note they're unable to advise you on anything to do with your EDF Energy account or tariffs. 

All questions must be answered, unless marked (optional)

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.