Octopus solar panels cost: what shapes the price
The price of an Octopus solar installation depends on the number of panels, roof design, battery choice and required installation work. Octopus currently advertises a two-panel system without a battery from £6,663 and a popular 12-panel system with a 10kWh battery at £11,115, both based on April 2026 prices [2]. These are starting points, not a substitute for a tailored quote.
A quote should explain the system size and why it fits your roof and electricity use. Larger is not always better: a well-designed system balances generation, daytime demand, export potential, battery capacity and budget.
How to keep the £100 referral on track
For a solar or heat-pump installation, the recipient and referrer each receive a £100 digital gift voucher after the installation has completed. The sequence matters: the recipient needs to use the referral link, sign up, and then obtain their quote using the same email address. Octopus states that it cannot add a referral retrospectively if the quote or purchase happened first [1].
- Register first: open the official referral page and submit the recipient's details.
- Keep one email address: use that same address for the Octopus quote and all follow-up.
- Review the design: the quote and survey determine whether the home and proposed system qualify.
- Wait for completion: vouchers are processed once the qualifying installation is finished [1].
Register before requesting a quote
That is the single rule most likely to protect eligibility. A referral link alone does not guarantee an installation, but quoting before registering can prevent the reward being applied [1].
Panel-only versus solar with a battery
Panel-only solar suits households that use more electricity during daylight hours or want the lowest initial cost. A battery stores some generation for later use and may suit households with significant evening demand, an electric vehicle or plans for a heat pump. It adds cost, so ask the designer to show how the capacity was chosen rather than treat a battery as an automatic upgrade.
Octopus says its solar range uses approximately 455W panels and includes options from small installations through to larger systems with battery storage [2]. Hardware and warranty details should be itemised on the proposal.
| Cost driver | Why it changes the quote |
|---|---|
| Panel count | Changes generation potential and roof installation work. |
| Battery capacity | Increases upfront price but can shift solar use into the evening. |
| Roof complexity | Can affect access, scaffolding and installation design. |
| Electrical work | May be required to connect and commission the system safely. |
Compare the written scope, not just the headline
Check that the quote includes equipment, warranties, access requirements, electrical work and any exclusions. VAT relief on qualifying energy-saving materials remains available until 31 March 2027 subject to the rules, so ask how it is reflected in the price. If you are using a referral, register before the quote so the £100 voucher remains separately tracked [1].
Keep the final decision evidence-led
The right comparison is total installed scope rather than price per panel. Two proposals can have the same panel count but differ in battery, inverter, access work, warranty and monitoring. Ask for a like-for-like specification before making a price comparison.
Request the specification in a format that lets you compare panel count, battery capacity and included work across quotes. That makes the financial decision clearer than a headline package price.