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plug-in solar battery · checked 2026-10-17

EcoFlow STREAM Ultra X

plug-in solar battery3.84 kWhElectrician connectionbackup

A 3.84 kWh home-storage battery with four direct solar inputs and a larger base capacity than the original STREAM Ultra. UK installation is hardwired by an electrician. Compare its grid-feed rating separately from the power available at its appliance outlets.

EcoFlow STREAM Ultra X base battery unit
Stated storage
3.84 kWh
Connection
Electrician connection

Price snapshot

£1,259 (was £1,499)

EcoFlow STREAM Ultra X base unit listed at £1,259.00 at EcoFlow’s UK store. Available to order when checked 17 October 2026. Installation, required accessories, panels and extra batteries are separate. Check the current price and dispatch estimate before ordering.

Source: EcoFlow UK official store · checked 2026-10-17

Check price at Amazon UK →
Estimate savings at this price →Enter usable capacity from the installation details; stated battery capacity is not delivered AC energy.

Compare home batteries →

UK rules check

Rules checked. The maker’s UK instructions require professional hardwiring. This confirms the installation boundary; it is not an independent certification of model-specific grid approval.

Checked 2026-10-17

Nominal capacity3.84 kWh manufacturer stated capacity; delivered AC energy is lower[1]
Output800W grid-tied output; 1,200W AC appliance output (maker figures)[1]
Solar input2,000W across four MPPT inputs; check panel voltage and current limits[1]
ChemistryLFP lithium iron phosphate[1]
Cycle life6,000 cycles to 70% remaining capacity (maker claim)[1]
Warranty10-year manufacturer warranty[1]
Backup powerYes. Compatible appliances on its own outlets; grid port disconnects during an outage[1]
Plug-inUK installation requires a qualified electrician and a hardwired connection; do not assume household-socket feed-in is permitted[1]
ExpandableSTREAM ecosystem supports multiple units; capacity and power depend on the exact configuration[1]
Weight and size38.8 kg; 420 × 294 × 460 mm (maker specification)[1]
DurabilityIP65; follow the installation clearances and location requirements[1]
Price£1,259.00 at EcoFlow UK (checked 17 Oct 2026)[2]

Direct-PV storage in the STREAM ecosystem. Verify the exact panel voltage/current limits and supported interconnections. A portable DELTA or RIVER power station is a separate product class.

Who it suits

Who should skip it

What you need

Good points
  • Four solar inputs allow separate compatible panel strings
  • Larger stated storage than a 1.92 kWh STREAM unit
  • A 10-year warranty is stated on the UK page
Watch out for
  • Electrician and installation cost must be budgeted
  • 1,200W appliance output is distinct from 800W grid feed
  • Savings depend on tariff, usage, installation and system configuration

Common questions

Can I plug the STREAM Ultra X into a UK wall socket?

The UK manufacturer FAQ requires the STREAM DIY cable to be wired into the distribution board by a qualified installer or electrician. Generic plug-and-play marketing does not establish permission for socket feed-in.

Does the Ultra X provide 2,300W from one battery?

The specification distinguishes 800W grid-tied output, 1,200W AC output and a higher supported-device figure. Configuration and operating mode matter; do not treat 2,300W marketing as continuous single-unit battery output.

Is 3.84 kWh the energy I get from AC sockets?

It is the manufacturer stated battery capacity. Inverter and charging losses mean delivered AC energy is lower; size a savings scenario using usable energy for the actual installation.

Worth comparing with

EcoFlow STREAM AC Pro →EcoFlow STREAM 5000 →Anker SOLIX Solarbank 4 E5000 Pro →

Sources

  1. EcoFlow UK — exact STREAM Ultra X product page, specifications and UK connection noteschecked 2026-10-17
  2. EcoFlow UK — exact base-unit variant and dated pricechecked 2026-10-17
  3. Amazon UK — EF ECOFLOW Stream Ultra X 3.84kWh Balcony Power Plant, 4 MPPT (exact UK offer)checked 2026-10-17

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