EcoFlow STREAM vs Anker SOLIX RS40P: Which UK Kit Should You Buy?

The two most popular plug-in solar kits in the UK are the EcoFlow STREAM 800W and the Anker SOLIX RS40P. Both generate 800W, both are UKCA certified, both install in under two hours, and both come with monitoring apps and UK warranties. So which one should you buy?

The honest answer is: for most buyers, it doesn't matter much. Both are good products that will generate similar amounts of electricity. But there are meaningful differences in price, panels, app quality, and ecosystem that make one or the other the right choice depending on your priorities. For the full financial case on either kit, use our payback calculator.

Price: Anker wins

The Anker SOLIX RS40P typically retails at £419–£449. The EcoFlow STREAM at £499. That's a £50–£80 gap. If cost is your primary consideration, Anker is the clear answer.

Panels: EcoFlow wins (narrowly)

EcoFlow's STREAM includes bifacial panels. Anker's RS40P uses monofacial. In a typical UK install, bifacial panels generate approximately 5–10% more due to reflected light. A modest but real advantage for EcoFlow.

App and monitoring: EcoFlow wins

The EcoFlow app is significantly more polished — real-time wattage, daily and monthly charts, carbon tracking. Anker's app is functional but more utilitarian. If you'll check your stats daily, EcoFlow's experience is meaningfully better.

Storage expandability

EcoFlow's STREAM Pro adds an integrated 1kWh battery for £979. For Anker, the Solarbank 2 Pro adds 1.6kWh storage at £599–£699. If you want maximum expandable storage, the Zendure SolarFlow works with either kit. See our home battery guide for a full comparison.

The verdict

Budget buyers: Anker SOLIX RS40P. Buyers who want better panels, a more polished app, and don't mind paying more: EcoFlow STREAM. For the full picture on both, see our best plug-in solar kits guide.