If you’re fed up with flipping breakers during storms or you live somewhere where the grid treats outages like a seasonal sport, EcoFlow just made a very big, very portable answer: the DELTA Pro Ultra X. It’s the company’s new top-tier whole-home battery system — the one with more numbers and bolder type than the last one — and it’s built to keep a house running not for hours, but for days or even weeks depending on how stingy you are with the lights.

EcoFlow says the Ultra X delivers up to 12kW of continuous output from a single inverter (and up to 36kW when three inverters are paralleled), with battery capacity that scales from 12kWh up to 180kWh. That combination—big inverter power plus very large storage—means the box can run heavy loads: central air, an induction oven, even an EV charger. On paper, a fully maxed-out system could keep an average U.S. household running for roughly a week or more, depending on how many circuits you keep on.

The Ultra X is an evolutionary jump rather than a total rethink. EcoFlow frames it as a ~60% increase in continuous power over the previous model, aiming squarely at households that want full-home coverage without the fuss of a permanent roof-mounted battery bank and months-long installs. The inverter scaling (one to three in parallel) is a practical touch for larger homes or small commercial setups that need short bursts of heavy power or sustained high loads.

The device stays modular—an EcoFlow hallmark—so you can start with an inverter and a couple of batteries and add more storage or a second inverter later. That makes it possible to spread the cost, move the system to a new house, or haul an inverter and batteries to a cabin or RV if your life includes summer migration.

How long will it keep your lights on?

Numbers help: the U.S. Energy Information Administration reports average household electricity use on the order of about 10,500–10,800kWh per year, which works out to roughly 29–30kWh per day. So a fully loaded 180kWh bank could — in theory — power a typical home for around six days if you ran everything. In practice, most people will isolate circuits (fridge, well pump, phone chargers, critical lights), and with that kind of selective load management, you can stretch the system into weeks. EcoFlow’s Smart Home Panel 3 is aimed at precisely this: letting you isolate essential circuits and shed the rest during an outage.

The install pitch: faster and (supposedly) easier

EcoFlow is leaning hard into “fast install” as a selling point. The company says it has 425 certified installer partners across the U.S. and claims the system can be scheduled and fully installed in under seven days, with the on-site electrician’s work taking about a day. That’s a striking promise compared with conventional whole-home battery projects, which can involve multiple trades and longer lead times. If you’re shopping, check local availability and whether your utility or permitting process introduces delays—those are the usual wild cards.

Smart panel, time-of-use, and the grid

The Ultra X pairs with EcoFlow’s Smart Home Panel 3, a 200-amp unit that can be wired as a main panel or a subpanel and monitor/control up to 32 circuits. It supports Time-of-Use (TOU) policies so the system can automatically charge when electricity is cheap and discharge when rates spike—or when outages occur. EcoFlow says the hardware works with third-party generators, solar, and EV chargers, and it includes two-way high-voltage PV inputs for sizable solar arrays. Those integrations make the Ultra X less of a standalone emergency generator and more of an energy-management platform.

Price and availability

EcoFlow opened preorders in mid-October. A DELTA Pro Ultra X bundle (one inverter + two batteries) starts at $7,999. The Smart Home Panel 3 sells separately for $2,999, though EcoFlow is offering a bundled package (inverter + two batteries + panel) at $10,899 for a limited time.

Who should care — and who should wait

The DELTA Pro Ultra X will be most interesting to homeowners who want near-seamless whole-home backup without permanent, welded-in battery walls, or to buyers who like the idea of a scalable, portable system that can be reconfigured over time. It’s also a serious option for people in storm-prone regions or rural areas where outages are frequent. If you already have a rooftop solar array and a willing utility, the Ultra X becomes a powerful energy-management hub.

If you’re price-sensitive, have a simple emergency-only use case, or prefer vendor-neutral grid-scale solutions, it’s worth waiting for independent long-term tests and reviews. Early adopters will pay a premium for speed and flexibility; patient buyers might find comparable value in integrated, roof-mounted systems after a season or two of reviews.

EcoFlow has taken the “portable battery” idea and quite literally upscaled it: more continuous power, more storage, faster installs, and a tighter plug-and-play story than the stodgier wall units you see in lots of new builds. For many households that want the security of multi-day backup plus the flexibility to move gear between properties, that’s a compelling trade. Just bring a checklist: installer availability in your area, the fine print on warranties and certifications, and a realistic estimate of how many circuits you actually need to keep on when the lights go out.