EcoFlow PowerOcean vs Anker SOLIX X1 (UK 2026)

The short version

EcoFlow PowerOcean and Anker SOLIX X1 are both modular, LFP-based residential battery systems designed for installed use in a UK home — not portable units. They compete for the same buyer: someone who wants a Tesla Powerwall 3 alternative from a large consumer-electronics brand with an MCS-installer network.

The systems are genuinely close on chemistry (both LFP, both ~6,000 cycles) and module size (both 5 kWh), and diverge on warranty terms, maximum scale, backup switchover speed, environmental rating and installer network depth.

Capacity and scale

EcoFlow PowerOcean uses 5 kWh modules and scales up to 15 kWh single-phase, or 45–60 kWh in a three-phase configuration. That covers the vast majority of UK domestic use cases, including large households with heat pumps and EVs.

Anker SOLIX X1 also uses 5 kWh modules but scales further: 5–30 kWh in a single-phase configuration and up to 180 kWh three-phase (six modules per stack, multiple stacks). For typical UK homes that's overkill; for larger properties, small commercial sites or homes running significant off-grid loads, it's a real advantage.

Continuous output

EcoFlow PowerOcean delivers up to 6 kW continuous single-phase, and 10–12 kW in three-phase configurations.

Anker SOLIX X1 delivers 3.68–6 kW single-phase (configurable, with G99 DNO approval required above 3.68 kW as with any UK home battery), and up to 12 kW in three-phase.

For most UK single-phase homes, both are broadly comparable and both sit below Tesla Powerwall 3's 11.04 kW single-unit ceiling. On three-phase installs, both can support genuinely heavy simultaneous loads.

Backup performance

This is a clear Anker win on published specs. Anker SOLIX X1 quotes 0 ms switchover on load-side backup (uninterruptible for connected loads) and under 10 ms for on-grid to off-grid transition. Sensitive electronics — desktops, home lab equipment, medical devices — see no interruption.

EcoFlow PowerOcean does not publish a specific switchover time for its backup configuration. In practice most homeowner loads (fridges, boilers, lighting) tolerate a brief switchover without issue, but if uninterruptible backup for sensitive kit is a priority, absence of a published figure matters.

Warranty

EcoFlow PowerOcean: 15-year warranty to 70% of original capacity. That's one of the longest warranties on the UK residential battery market.

Anker SOLIX X1: 10-year battery warranty to 80% of original capacity, with a throughput cap of 13.17 MWh per 5 kWh module. Whichever limit is hit first ends warranty coverage on that module.

In plain English: EcoFlow gives you five more years of coverage but permits deeper degradation before it declines a claim; Anker gives you fewer years but holds you to a tighter capacity floor. Which is the better deal depends on how hard you cycle the battery.

Chemistry, cycles and enclosure

Both use LFP (LiFePO4) chemistry and are rated at approximately 6,000 cycles. LFP is the industry-standard choice for residential storage in 2026: thermally stable, long cycle life, no cobalt, low fire risk.

Enclosure-wise, EcoFlow PowerOcean is IP65 rated. Anker SOLIX X1 is IP66 with C5-M anti-corrosion coating and rated for −20°C to 55°C operating range. If your intended location is exposed (coastal, unheated outbuilding, exposed exterior wall), Anker's environmental spec is genuinely tougher.

Fitted UK prices (indicative)

EcoFlow PowerOcean: around £5,500 fitted for a 5 kWh single-module install, rising to around £10,000 for a 15 kWh single-phase configuration.

Anker SOLIX X1: around £3,700 fitted for a 6 kW hybrid inverter plus 5 kWh battery module, rising to around £8,500 for the same inverter plus 20 kWh of battery.

Both benefit from 0% VAT on battery storage installations in Great Britain until 31 March 2027. Both need MCS-certified installers who are trained on the specific product — installer networks for both are smaller than Tesla's, so lead times and pricing can vary more by region.

Installer network and practical availability

Both brands operate through certified installer networks in the UK — you can't buy the hardware standalone and DIY the install. Both networks are considerably smaller than Tesla Powerwall 3's, so 'is anyone near me trained on this?' is a real question in some regions.

For getting real numbers, we recommend requesting quotes for both product families from MCS-certified installers in your area — the mix of hardware available at competitive fitted prices varies significantly by region.

Verdict

EcoFlow PowerOcean wins if warranty length matters most to you — 15 years is genuinely category-leading, and the 70% capacity threshold is manageable for most homes cycling once per day.

Anker SOLIX X1 wins if you need serious scale (up to 180 kWh three-phase), published fast backup switchover for sensitive loads, or a tougher enclosure for a challenging install location.

Neither has Tesla Powerwall 3's UK installer footprint or its 11.04 kW single-unit continuous output. If those factor into your decision, Powerwall 3 is worth comparing directly — see the best home battery UK roundup for a side-by-side.