About this site

What the site does

It does three things. It publishes what home batteries cost and what decides the price, sourced and dated. It runs one savings model, with published assumptions, that you can fill in with your own usage, tariff and region. And, if you ask, it answers a request for quotes by email, so that you can check the prices you are offered.

The model behind the calculator, the regional pages and every worked example on the site is the same one, so a figure on one page will not contradict a figure on another. The assumptions are listed on the methodology page.

What the site does not do

• It does not install, supply, design, finance or maintain batteries or solar panels.
• It holds no MCS, NICEIC, NAPIT, RECC, HIES, TrustMark or manufacturer accreditation, and claims none. Those are registers you should check an installer against, and the site explains how.
• It publishes no customer reviews, testimonials or case studies of real installations. Worked examples are modelled and labelled "Illustrative example".
• It is not a Tesla certified installer, a Sigenergy or Fox ESS approved installer, or a reseller of any brand. Brand pages describe what manufacturers publish.
• It does not give financial advice. Where finance is mentioned, the site describes the options and says to read the terms.

How the site is paid for

Battery Storage Quotes is published by SEO Dons Ltd (company number 16766013, registered office 71-75 Shelton Street, Covent Garden, London WC2H 9JQ). When a reader asks for quotes, the publisher replies by email. There is no installer partner and no fee at present, and any change will be stated here before it applies. It costs the reader nothing and there is no obligation to accept any quote.

No installer or manufacturer can change a price range, a tariff table or an assumption on this site, and the quote checker gives the same verdict whichever installer produced the quote. The privacy notice sets out exactly who receives an enquiry.

Where the numbers come from

Tariff rates come from Octopus Energy's public API, which publishes every regional rate in machine-readable form, and from suppliers' own pages. Solar yields come from the European Commission's PVGIS model. Rules come from GOV.UK, Ofgem, HMRC, the Energy Networks Association, BSI and MCS. Prices come from manufacturers' published prices and from dated, published price guides, and every figure is listed with its source on the page that uses it.

Dated facts are re-checked on a schedule: tariffs quarterly (each time the price cap moves), VAT and grant rules after each Budget, product prices and warranties when a manufacturer changes them. Each page shows the date it was last checked.

How a page is checked

• Primary documents first. A warranty term comes from the manufacturer's own warranty document, a VAT rule from HMRC, a tariff rate from the supplier's published rates. A retailer's or blog's summary is used only where nothing better exists, and it is named as such.
• Where sources disagree, both are shown. Octopus, for example, advertises a 12-year warranty for the inverter and battery in its Fox ESS package, while Fox ESS's own UK policy gives its EP batteries 10 years. The page reports the manufacturer's term and tells you to ask who provides the difference.
• Prices carry who and when. A price is never shown without the business that published it and the date or price basis it gave.
• Modelled figures are labelled. Every saving or payback on the site comes from the published model, and says so.
• Nothing is published that cannot be checked: no star ratings, no testimonials, no "best installer" lists and no invented examples presented as real homes.

Corrections

If something on the site is wrong or out of date, use the contact form. Corrections are made at the source data, so the fix reaches every page that uses the figure.

Recent corrections and updates

A dated record of changes that altered a fact on a live page, newest first:

• 28 October 2026. The Octopus Flux rates page was rebuilt from Octopus's public data after Octopus raised the Flux unit rates on 19 October: in London the standard rate went from 24.25p to 26.78p a kWh. The page had said the unit rates were not rising. The savings model still uses 26 September rates, and the pages that rely on it say so.
• 28 October 2026. The GivEnergy administration pages were updated after a Companies House recheck: the compulsory strike-off action against GivEnergy Software Ltd, which runs the app, was recorded as suspended on 30 September 2026. The pages had described an active proposal to strike off without that detail.
• 14 October 2026. The tariff guides now say Octopus Go needs a compatible electric car, so a battery-only home cannot join it, and the Smart Export Guarantee wording for battery exports follows Ofgem's guidance.
• 7 October 2026. The phrase "low and zero-interest loans" was replaced by "lower-interest loans" on 14 pages, because the Warm Homes Loan Scheme rules let lenders pass on a lower rate but do not promise a zero rate.