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I tested the EcoFlow Stream Ultra X — a balcony solar battery that's a game-change for renters

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The Stream Ultra X is a genuinely impressive piece of kit. It packs a serious 3.84 kWh LFP battery into a unit that bolts to a balcony wall or sits inside a home or business. The AI energy management is smart, the app is polished, and the expandability up to 22 kWh is compelling.

Pros

  • +Massive 3.84 kWh LFP battery capacity
  • +In theory, plug-and-play, no electrician required
  • +Expandable up to 23 kWh with additional units.
  • +AI-driven Time-of-Use optimisation
  • +IP65 rated for outdoor use with a built-in battery heater.

Cons

  • -Weighs 38.8 kg, making installation a two-person job at a minimum.
  • -Not a cheap item
  • -Some AI features require a paid app subscription.
  • -Only 800W to house

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