Three different jobs, three different products. A battery that bolts onto your existing 800W microinverter is not the same product as a portable LFP power station you charge from a folding panel on the balcony. Both are legitimate, but mixing them up wastes money. I have organised this page by the job, not by the brand. Pick the category first, then the spec. For the wider picture on why storage is worth understanding now, see why Britain's battery boom has reached the grid before most homes.
Seen on UK shelves. EcoFlow and Jackery batteries are now stacked in Costco, with Currys, B&Q and Lidl following. What the retail shift means, read against Germany's balcony boom →
Which battery should you buy?
Three quick verdicts, then the full spec table. The primary link goes direct to EcoFlow, so you get UK VAT, UK returns and the 5-year warranty, with Amazon UK shown as an alternative.
Anything with a battery sits outside the plug-in route, because the legal definition excludes devices designed to import electricity in order to store it for later. These are still a good buy and still legal, they simply need a qualified electrician for a fixed install, or they work as portable units with no wiring at all.
Looking for something you can plug straight in from 27 August? See the plug-in kits under £500.
EcoFlow STREAM Pro 1.92 kWh
The default UK kit-integrated balcony battery: 800W in, 1200W AC out, stack to 11.52 kWh, smart time-of-use built in.
Latest price at EcoFlow →also on Amazon UKEcoFlow STREAM AC Pro (battery only)
Bolt 1.92 kWh onto any 800W microinverter you already run. The retrofit path if you have panels but no storage yet.
Latest price at EcoFlow →also on Amazon UKEcoFlow STREAM Ultra X 3.84 kWh
Top of the balcony range: 3.84 kWh, 1600W, four panels, expandable to 23 kWh. For a confirmed sunny spot with real daytime load.
Latest price at EcoFlow →also on Amazon UK| EcoFlow balcony battery | Battery | AC out | Expandable | Warranty | From | Buy |
|---|---|---|---|---|---|---|
| STREAM AC Pro (battery only) | 1.92 kWh | 1200W | 11.52 kWh | 5 yr | ~£798 | Latest price |
| STREAM Pro (2 panels + battery) | 1.92 kWh | 1200W | 11.52 kWh | 5 yr | ~£979 | Latest price |
| STREAM Ultra (4 panels + battery) | 1.92 kWh | 2300W | 21 kWh | 5 yr | ~£1,299 | Latest price |
| STREAM Ultra X (4 panels + big battery) | 3.84 kWh | 2300W | 23 kWh | 5 yr | ~£1,999 | Latest price |
Prices are time-of-writing references from EcoFlow UK and Amazon UK and change; the button shows the live price, never a promised one. Disclosed affiliate links: EcoFlow direct via Awin, Amazon UK. How we stay free.
1. Kit-integrated battery (panels + microinverter + battery in one box)
2. Standalone add-on battery (works with any microinverter)
3. Portable power stations (charged from a folding panel or wall socket)
How to choose between the three categories
- Buying from scratch, staying in one place for 3+ years: kit-integrated. STREAM Pro for most flats, Ultra X if you have the panels and the base load.
- You already own a panel-only 800W kit (or are planning a Hoymiles + 2 panels build): STREAM AC Pro standalone bolts onto whatever microinverter you have.
- Renting, moving in the next 18 months, or want an off-grid corner: portable power station, sized by your daytime base load. 1 kWh covers a laptop, lights, a fridge for a few hours. 2 kWh covers a whole flat for an evening.
UK warranty and support, in brief
All four brands (EcoFlow, Anker, Bluetti, Jackery) offer 5-year warranties on the LFP battery in their flagship UK lines, with 2-year warranties on the inverter and chassis. UK-side support quality varies. In my experience, EcoFlow and Anker have the fastest UK consumer response. Bluetti and Jackery both route through European service centres which lengthens turnaround. Buy from Amazon UK (rather than direct from a manufacturer micro-site) to keep the consumer-protection chain short.
What this page is not
This is a buyer's directory. It is not a route to compliance. None of these batteries change the UK installation picture: if your battery is grid-connected via a microinverter, the install still routes through a CPS-registered electrician and G98 notification to your DNO. Portable power stations charged via DC do not need G98 because they are not exporting to the grid. See BS 7671 and Plug-In Solar in the UK and the G98 Form walkthrough if you are not sure which side of the line your install sits on.
Related reading: Is a plug-in solar battery worth it? · Battery idle draw and runtime · Microinverters UK · UK plug-in solar kits · Postcode solar calculator