Your solar installation questions, answered

The cost of installation can depend on how many panels you need, whether you choose to have battery storage and what size of battery you require. The cost of a panel-only installation by Octopus starts from £4,100 (for 2 panels). A 10 panel installation and a 5kWh battery (our most popular system) costs £9,199. Get a quick fixed quote to find out how much it’ll cost for you, based on your home.

Our systems typically pay for themselves in 9 - 11 years.

We compared the typical installation cost and annual bill savings for our most common solar system (10 panels, 5kWh) in 5 different scenarios. The payback period varied from 9 - 11 years depending on the energy tariff.

Of course, each home is unique and this can be influenced by lots of different factors.

We’ll calculate a personalised payback period following our design consultation, to let you know what you might save for your home.

Find more info on payback periods in this blog

Before installation, we’ll ask which tariff you’d like to join. We’ll also need to get permission from your distribution network operator before you can begin exporting your energy. When sorted, they’ll supply you with a unique ‘export MPAN’ number which will mean you’re good to go.

To monitor your energy usage and generation, you’ll be set up on the app, and you’ll also be able to see this information from your Octopus Energy account. If you decide to join an Octopus tariff, export payments will be paid directly into your Octopus account.

We have several industry-leading solar tariffs, tailored to maximise your savings and export earnings.
There’s options for if you prefer to set it and forget it, or adapt how you use energy to save every day. We also have dedicated tariffs for if you have other low-carbon tech at home, like an electric car ☀️🚗.

The tariffs

• Intelligent Octopus Flux: We pair with your battery to optimise charging and discharging, and you don't need to lift a finger. Available with Enphase and Givenergy batteries - IO Flux customers make the biggest savings.
• Octopus Flux: Take control with super cheap rates between 2am-5am every day to top up your battery, plus a peak rate from 4pm-9pm when you can discharge it.
• Outgoing Octopus: Agile & Fixed options for if you’d prefer to pair your export tariff with a different import tariff. Find out more about which tariffs work together here.
• Octopus SEG: If you’d prefer to go with another supplier for your import energy, you can still join our standard Smart Export Guarantee tariff.

Still sure which tariff is right for you? Take our quiz to find out the most popular tariffs for homes like yours, and check out all the tariffs in detail.

Check out more detail on solar smart tariffs on our savings blog.

Following installation, we’ll ask that you install the Enphase app, GivEnergy app or Tesla app, depending on which brand of inverter you have installed.

With the mobile app, you’ll be able to monitor and manage your usage anytime, anywhere. It’s really simple to use, and simple to control when you need to. If you have any further questions or concerns, don’t hesitate to get in touch.

First, check out our solar explorer to find out how much for estimated solar costs and savings.

Next, to get a tailored quote and solar design for your home, hit 'enquire now' from the solar explorer. We'll be in touch straight away to arrange the good time to call and ask a few additional questions.

Within a few days, we'll send over your personalised solar quote. This price that covers everything you’ll need for a standard solar and battery installation. We’ll then take a £200 advance payment (fully refundable until the day before scaffolding installation).

Next our Solar Design Specialists will work with you to design the ideal system for your home, using state-of-the-art software to visualise the path of the sun and where to best position your solar panels. You’ll have the option to change the design to fit your budget, and remove the battery if you choose to.

We’ll ask you to fill out a remote survey form to ensure your solar design is spot-on before installation. If you’re not able to complete the remote survey, we will arrange a date for a surveyor to visit your property.

Finally we’ll find a suitable date for your installation. Installation should take 2-4 days, depending on the size of your system. We will also schedule time on either side of this to put up and take down the scaffolding at your property. Once installation is complete, we’ll request the remainder of the total cost.

We’ll be here to answer any questions or concerns that you have throughout the process, and our aftercare team will be available by phone 7 days a week once your installation is complete.

Standard installs can be completed within 2 days, and bigger installs can take between 3-4 days. If you need to be elsewhere, no problem - we just ask that you’re in the property whilst we do the wiring, which will take a few hours on one day.

We're currently installing across most of England, but we're working to extend our tentacles across the rest of the UK as quickly as possible.

For an Octopus solar installation, you will need to own your home, and you will need a clear space on a pitched roof (aka not flat) that can fit at least 2 solar panels. See our FAQ on how much space you'll need for sizes.

Please note that we're not able to install solar for flats or properties with a 3 phase electricity meter just yet. And at present we are only able to install solar systems on roofs with clay or concrete roof tiles.

It's important that this part of your roof sees the sun throughout the day, so a north facing roof will generate less power, and could be unsuitable. We'll also need to be able to install scaffolding below the roof where the panels will be fitted in order to complete the installation.

If Octopus are unable to install solar at your home, we may be able to recommend an Octopus Trusted Partner to complete the job for you, with equivalent care and quality.

On your roof, the number of panels we recommend will depend on the amount of space you have and how much energy you use.

Our panels are 1.7m length 1.1m wide each, and we'll need space for a 40cm gap between the edge of the roof and the solar system. The average number of panels is around 10-12 (4.5kW) and the minimum number we can fit is 2.

In general, the more panels on the roof, the more electricity you will generate, so we’d only recommend a large array if your usage is high. We’ll discuss all of these options with you.

We now install microinverters as standard, which don’t require space inside your home inside your home. However if we are installing a GivEnergy system, you will need space for an inverter measuring: (HxDxW) 440 x 260 x 480 (mm). No inverters are required with a Tesla Powerwall.

If you choose to also have a battery, these come in several sizes:

Enphase

5kWh dimensions: (HxDxW) 980 x 188 x 550 (mm)

10kWh will be 2 of the batteries specified above, and will require a space of 150mm between each battery.

GivEnergy

5.2kWh dimensions: (HxDxW) 515 x 220 x 480 (mm)

9.5kWh dimensions: (HxDxW) 800 x 223 x 480 (mm)

Tesla Powerwall
13.5kWh dimensions: (HxDxW) 1099 x 193 x 609 (mm)

A roof where water is able to run off the solar panels will be suitable, but a pitched roof is best, as it can provide the best angle for a solar panel to face the sun, without having to use a stand. Unfortunately we’re not able to install solar panels on flat roofs, thatched roofs or slate roofs just now.

In the UK, south facing solar panels will generate the most energy as they spend the maximum time facing the sun, whereas north facing panels are not generally not recommended because they’ll see little direct sunlight. The Energy Savings Trust estimates that panels facing east or west will yield around 15-20% less energy than one facing directly south. However if you have both an eastern and western facing roof, you have the option to have panels on each side, to follow the sun’s path throughout the day.

It’s also important to avoid shady spots on your roof to generate the maximum amount of energy.

Unfortunately you need to be the property owner to have solar panels installed on your roof. Additionally, if you own a top floor flat you may need to get the freeholders permission to have solar installed on the roof.

Your consumer unit is small and will be placed next to your existing consumer unit/fuse box. The battery (if you choose to have one) can go inside or outside of your home.

The physical size of the battery will depend on how powerful it is, but to give you an idea, the smallest battery is around the size of plane carry-on luggage and the larger battery is the size of a check-in bag. If we need to install a GivEnergy inverter, this is about the same size as the smallest battery but most installations come with microinverters which are installed on your roof, or a built-in inverter in the battery (Tesla).

The solar panels themselves don’t make any noise, however during the day whilst the panels are generating, your inverter may hum quietly at a maximum of 45 decibels (the sound level of a quiet library).

The only time you will need planning permission to install Solar Panels is when the property is listed or in a conservation area. In cases where your system will require a 5kWh inverter (usually around 12 panels or more), we’ll need to get in touch with your distribution network operator (DNO) to ask for permission. This process usually takes a couple of weeks but we will sort everything for you.

Our expert team is committed to choosing the best quality products for our customers, to ensure that you get the best efficiency, and ultimately make the best savings with your solar installation.

Our solar packages are installed with state-of-the-art 440W PV solar panels from JA Solar, and the IQ8 Microinverter from Enphase as standard.

For all battery installations, we will offer the industry-leading Enphase IQ Battery 5P as standard, or the Tesla Powerwall 3. For a 5kWh system, we will install one Enphase battery, and for a 10kWh installation, we will install 2 batteries.

However Enphase intallation is subject to DNO approval, and if we find that this product isn’t suitable for your home, we will offer a suitable alternative for both your battery and inverter, without ever compromising on quality.
Find out more about panels and inverters here.


Enphase battery benefits:

• Fully integrated AC battery system
• Embedded IQ8D-BAT Microinverters
• Field-replaceable components 
• Stable lithium iron phosphate (LFP) chemistry for maximum safety and longevity
• Cools passively with no moving parts or fans 
• Uses wired communication for fast and consistent connection
• Quick and easy plug-and-play installation
• Remote software and firmware upgrades
• Offers homeowners remote monitoring and control from the Enphase App
  

Tesla battery benefits

1. A solar panel’s photovoltaic (PV) cells convert the particles in sunlight into a direct electrical current (DC). This current travels down through the cables, into your home.
2. The inverter converts this direct current (DC) into an alternating current (AC). This electricity can then be used straight away to power lights & sockets around the home.
3. Once the house has all the power it needs, excess energy can be stored in the battery for use when the sun isn’t shining. If you don’t have a battery, this electricity travels directly to the smart meter.
4. From the electricity meter, any energy that hasn’t been used or stored can be sent back to the grid. Here the smart meter will record how much energy has been exported so that you can be paid for it later.
5. All of the clean, green energy you generated but didn’t use is distributed to other homes in the area.
   
   Find out how this works on a bigger scale here.

Yes - even when it's cloudy and grey, snowing or raining, the panels will still generate electricity if it’s light outside, although less will be generated than in bright sunshine. The only time the panels won’t generate is at nighttime, because the sun isn’t shining.

Together with your solar panels, we’ll install:

• A small consumer unit (also known as a fuse box),
• An export meter, to measure how much energy your panels generate, and how much of that is exported to the grid.
• Microinverters, to convert the electricity into an alternating current, which can be used to power your home. These sit underneath each panel. If you have a Tesla battery installed, you won't need inverters.
• (Optional) A battery, to store any excess electricity that’s generated.

A battery will allow you to store any electricity you don't use, so that instead of exporting the energy back to the grid, you can use it later when the sun isn't shining. The initial cost for a battery is higher than solar panels alone, but it's a great idea if you wish to be self-sufficient and avoid spending money on pricey electricity from the grid in the long-run. You can also guarantee that the majority of the electricity you're using is 100% clean, green and home-generated.

This depends on both how much electricity you generate and when you use it most. For example, if you tend to use a lot of energy in the evening, we’ll probably recommend a battery. This is because you won’t be there to use the energy when the sun is brightest during the day; instead you can store the electricity in the battery for use in the evening. You may also be able to save more with a battery when paired with one of our solar smart tariffs.

Our lives are varied, so there are many more circumstances that might impact this decision - but this is something that our solar advisors will be able to help you with. Find out more about savings here.

A larger home battery may not always result in higher savings. This is because there’s a chance that additional capacity might exceed daily energy needs, leading to unused stored energy and reduced efficiency. Additionally, the cost of a larger battery may outweigh the savings gained from storing excess energy. Therefore, matching battery size to specific energy requirements is important for maximising savings.

Yes, this is now available for customers with or without existing solar panels. Just get in touch with our solar sales team for further information.

Call us: 0808 196 6842

Email: solar@octopus.energy

(Our phone lines are open 9am - 5pm Monday to Thursday, and 9am - 4pm Friday.)

All of our equipment comes with a manufacturer warranty:

• Solar Panels: 25 years product warranty and 30 years linear power warranty.
• Inverter: Enphase Microinverters come with a product warranty of 25 years, whilst the GivEnergy inverter is covered by a 12 year product warranty.
• Batteries: 12 years for GivEnergy products and 15 years for Enphase products.
  
  Our customers are also protected by a 2 year Workmanship Warranty Insurance scheme.

One of the best things about solar is that the panels are easy to maintain. Our bird proofing ensures that pigeons aren’t able to nest and tamper with your system, and the angle of the panels ensures that rain and snow will slide right off whilst cleaning them at the same time (although they appreciate being cleaned from time to time - see FAQ below). Over time, you’ll need to be aware of anything new shading the panels to make sure you continue to get the very best out of them.

To make sure your panels are absorbing as much sunlight as possible, we recommend giving them a clean every now and again - the frequency really depends on where you live, and how dirty they get.

If you have a steep roof, you might find that the rain is more than enough to clean your panels so you never have to worry.

If you have a shallow roof, you might need to clean every couple of years or more -- the bird protection that comes with your panels should help to reduce this.

If you can see dirt on your panels, it’s worth speaking to your local window cleaner to find out if they’ll do it for you - but it’s important to only use water to clean them as cleaning chemicals can damage the coating.

Or if you want to do it yourself, all you need is a soft brush on an extendable pole, without chemicals.

If you’d prefer to spread the cost of your solar installation, we can connect you with DivideBuy. DivideBuy can arrange interest free loans over terms of 1, 2 and 3 years. Or over 5 or 7 years at a fixed interest rate of 9.9% APR. Loans are subject to terms and eligibility.

To find out roughly how much that will be for you each month, explore costs with our solar explorer.

Representative example: 9.9% APR over 5 years

The cash price of the goods is £10,000.00. The total amount repayable is £12,506.36, which includes £2,506.36 in interest at 9.9% APR fixed over the loan term. The repayments comprise the first instalment of £167.06 (with no interest charged), followed by 58 monthly payments of £209.14 and a final payment of £209.18 at a representative 9.9% APR. The total amount of credit is £10,000.00.

Finance is offered through Zopa Bank Limited (company number: 10627575), trading as DivideBuy, which is authorised by the Prudential Regulation Authority and regulated by the Financial Conduct Authority and Prudential Regulation Authority, firm reference number 800542. Zopa Bank Limited is incorporated in England and Wales and has its registered office at: 1st Floor, Cottons Centre, Tooley Street, London, SE1 2QG. VAT Number 281765280. DivideBuy's trading address is First Floor, Brunswick Court, Brunswick Street, Newcastle-under-Lyme, ST5 1HH. Octopus Energy Services Ltd is an appointed representative of Octopus Electric Vehicles Ltd and is a credit broker and not a lender. Octopus Electric Vehicles Limited is authorised and regulated by the Financial Conduct Authority, firm reference number 809736.

Credit applicants must be aged over 18 and be a permanent UK resident. You also need to have an accepted debit card and a valid UK mobile telephone number. Lending is subject to your individual circumstances and satisfactory completion of Zopa Bank Limited’s credit checks. Zopa Bank Limited is committed to responsible lending. It is important that you do not take on more borrowing than you can afford. If you miss your repayments, this may impact your credit rating and make it more difficult to obtain credit in the future.

After you've explored solar costs on our website and submitted an application, you’ll speak with one of our solar design specialists who will build your tailored quote. Once you receive your quote, you’ll have 14 days to decide whether to buy. Don’t worry though, if you can’t decide in 14 days, you can contact us and we’ll reissue a new quote. If you’d like to pay by finance, let us know and we’ll share your details with DivideBuy and they will be in touch to start your application. Your payment plan will begin after installation and will be managed directly by DivideBuy.

If you have any questions about finance after your installation, you’ll need to contact DivideBuy directly.

f you’re ineligible for finance but you'd like to continue with your purchase, no problem - you just have to let us know that you are able to pay in full and we’ll organise that for you.

If you change your mind about finance, you have 14 days to withdraw from your finance agreement without giving any reason. This period starts from either the day after you make the agreement or the day you receive a signed copy of it, whichever is later. For any inquiries specifically relating to your finance arrangement, including to cancel it, please contact DivideBuy directly.

Yes. They’ll perform a soft credit check first. This means it’ll show on your credit file but won’t impact your credit score, and won’t be visible to other lenders.

If you choose to proceed with your finance application, a full credit check will be completed as part of the application. This is known as a hard search and will leave a footprint on your credit file and is visible to other lenders. This could impact your credit score.

Interested in a solar and battery installation?

Call us: 0808 196 6842
Email: solar@octopus.energy
(our phone lines are open 9am - 5pm, Monday to Thursday, and 9am - 4pm Friday.)

Need support after installation?

Call us: 0808 175 1696
Email: solar-aftercare@octopusenergy.services
(Our aftercare phone line is open 8am – 8pm Monday to Saturday, 10am - 6pm Sunday. Or we answer emails 7 days a week, so we’ll be on hand to help asap.)

For the fastest response, fill out this form to raise any issues. Alternatively, you can email us on solar@octopus.energy, or call 0808 196 6842.
Our phone lines are open 9am - 5pm, Monday to Thursday, and 9am - 4pm Friday.

Check out our full complaints procedure here.