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Alectrona

Battery storage · works with your existing solar

Add a battery to your solar. Stop exporting power for pennies.

Keep the energy you make, instead of selling it cheap.

Your panels sell spare power back to the grid for a fraction of what you pay to buy it back at night. A battery keeps that energy for you. We retrofit a battery to almost any existing solar system, on a 0% VAT install, usually in a day.

Get a fixed quote How it works
  • Works with any inverter brand
  • 0% VAT until 31 March 2027
  • No MCS required
  • Usually fitted in a day
The honest version
  • 0% VAT on battery storage until 31 March 2027
  • Any inverter brand AC-coupled, any age
  • No MCS required VAT-registered installer only
  • ~1 day typical install most retrofits
01 Why a battery, why now

Your solar is being exported for pennies. A battery stops that. Store the daytime surplus, use it in the evening, and charge cheaply overnight on a smart tariff.

Most homes use about a quarter of what their solar generates during the day and export the rest. You’re paid roughly 3–15p for each unit you export, then buy units back in the evening at 25–30p. A battery stores your daytime surplus and gives it back when you’d otherwise be buying, so far less of your solar is wasted and far less of your evening is bought from the grid. On a smart overnight tariff, the same battery also charges up cheaply when rates are lowest.

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Works with your existing solar

You almost certainly don’t need to replace anything you already have.

Two ways to add storage, plus a route with no solar at all. We recommend the right one after looking at your system.

Recommended The usual retrofit

AC-coupled

The battery brings its own small inverter and connects alongside your existing setup.

  • Works with any solar inverter: any age, any brand
  • Suits older Feed-in-Tariff systems
  • Your panels, inverter and FiT payments are untouched
  • Most installs are done in a day
When it makes sense

DC-coupled / hybrid

If your inverter is old, faulty or you’re expanding the system, we can fit a hybrid inverter and battery together.

  • A little more efficient and tidier
  • One inverter does solar and battery
  • Worth it only when the inverter is due for replacement anyway
No solar yet

Standalone battery

No solar at all? A battery still works on its own.

  • Charge it overnight on a cheap rate
  • Run the house from it during the expensive parts of the day
02 What you could save

Honest numbers, modelled from your real usage, never a brochure average. Most homes land in the 7–10 year payback range. We’ll tell you straight if a battery doesn’t pay for your situation.

A well-sized battery typically lifts the share of your own solar you actually use from around a quarter to most of it, and shifts your evening off the grid. Households on a smart overnight tariff stack a second saving by charging cheaply. We’ll model your real numbers from your usage and tariff before you commit, so the figure you see is honest, not a brochure average.

We size the battery to cover your evening and overnight use without paying for capacity you won’t cycle. Payback for most homes lands in the 7–10 year range, and sooner for EV owners on an overnight tariff. Ask us and we’ll model yours, with the actual saving in pounds, before you decide anything.

The batteries we fit

Quality, bankable batteries, picked for your system, not for our margin.

We fit quality, bankable batteries and pick the one that suits your system and budget, not the one with the biggest margin. Every job gets ArcBox protection on every man-made MC4 and is verified before we leave.

03 How it works

Four steps, no surprises. From a photo of your inverter to a tidy install, usually in a day.

  1. Details

    Tell us about your system.

    A few details, or a photo of your inverter, and your recent bills.

    A few minutes · Remote

  2. Survey

    Free survey and honest numbers.

    We confirm the best retrofit route and model your real savings and payback.

    No deposit on a promise

  3. Quote

    Fixed quote.

    One price, no surprises, 0% VAT.

    One fixed price

  4. Install

    Install, usually in a day.

    Tidy work, ArcBox protection on every man-made MC4, tested and commissioned. We handle the G99 paperwork.

    Usually a day

FAQ

Battery storage — common questions

Yes. An AC-coupled battery works alongside almost any existing solar inverter, whatever the brand or age, without touching your panels or your Feed-in-Tariff.
Almost certainly. AC-coupled storage is inverter-agnostic. If your inverter is old or faulty, we may suggest a hybrid instead, and we’ll explain why.
Usually no. We only recommend it when your inverter is failing or you’re expanding the system.
For most solar homes, yes, especially on a smart tariff or with an EV. We model your real savings first and tell you honestly if it doesn’t add up for you.
Enough to cover your evening and overnight use without paying for capacity you won’t cycle. We size it to your actual usage, not a generic number.
Only with the right battery and setup, and usually for selected circuits. Tell us if it matters and we’ll specify for it.
Yes, on home battery storage until 31 March 2027 (then 5%). It applies to retrofit and standalone batteries.
No. MCS isn’t required for battery storage or for the 0% VAT. It only matters for new solar that needs the Smart Export Guarantee.
We make the G99 application to your network operator for you. It’s a short approval and we handle it end to end.
Most retrofits are a single day.
It depends on your system, budget and whether you want backup. We’ll recommend from quality brands (Tesla, Sigenergy, Fox ESS, SolaX, AlphaESS, Puredrive).
Yes. Charge it overnight on a cheap rate and run the house from it during expensive hours.
No. An AC-coupled retrofit leaves your existing solar and FiT metering as they are.
Batteries typically carry a 10–15 year manufacturer warranty depending on brand. Our workmanship is covered separately. We’ll confirm the exact terms in your quote.
The 0% VAT window runs to March 2027, and every month you wait is more solar exported for pennies. If the numbers work, sooner is better. We’ll tell you if they don’t.
Get a quote

Get an honest quote for your battery.

Send us your inverter and a recent bill. We’ll confirm the right retrofit and model your real savings, 0% VAT, no obligation.

  • Works with any inverter brand
  • 0% VAT until 31 March 2027, no MCS required
  • We make the G99 application for you
  • Honest payback modelled before you commit