EcoFlow DELTA Pro Ultra Review: Silent Power, Pricey Setup

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Overview

A gas generator gets a house through an outage with noise, exhaust and trips for fuel. The EcoFlow DELTA Pro Ultra does the same job from a battery: a 7,200W inverter with true 120V and 240V output, sitting on a 6,144Wh lithium iron phosphate (LFP) battery. This Amazon.com listing pairs it with two 400W portable solar panels. It is built for homeowners who need a fridge, a furnace blower, a well pump or a few 240V circuits to keep running when the grid goes down, and who would rather not store gasoline to do it.

Most large power stations are one box you can expand a little. The DELTA Pro Ultra is modular from the start. The inverter and battery are separate pieces, one inverter takes up to five batteries for 30kWh, and EcoFlow’s Smart Home Panel 2 can link three inverters for 21.6kW of output and 90kWh of storage. EcoFlow also says it is the only portable power station certified to both UL 1973 and UL 9540, the battery and energy-storage-system safety standards used for home batteries.

Key Specifications

EcoFlow DELTA Pro Ultra Power Output and 240V Capability

The headline number is 7,200W of continuous output at either 120V or 240V split phase, and EcoFlow rates surge at 10.8kW. In The Solar Lab’s testing, the unit held a 9,200W load for about 10 seconds, briefly touching 9,300W before it shut down: well above the continuous rating, though short of the surge figure. It also ran a load just under 6,000W for 59 minutes, which the outlet worked out as 98% efficiency. EcoFlow says, and SolarReviews repeats, that a single unit can run a three-ton central air conditioner.

Most power stations stop at 120V, which rules out a well pump, an electric dryer or a central AC compressor entirely. This one runs them directly. Noise is the other half of the case against a gas generator. The Solar Lab found it dead silent under heavy load and called it one of the quietest power stations it has tested. Yahoo Tech’s Rick Broida described it as completely silent while it backed up his home.

Battery Runtime and Expansion

6,144Wh is a lot for a power station but modest for a house, and Yahoo Tech’s outage tests show where the line falls. On a mild day with little furnace use, one battery was on pace for about 15 hours by Broida’s estimate; he ended that test at 10 hours with 20% left. On a cold day with the furnace working hard, it lasted about six hours, with the furnace accounting for half of the total draw. Heating season is when a single battery runs out fastest.

The answer is more batteries, which is where the modular design pays off: each inverter takes up to five, for 30kWh. Each extra battery is a major purchase in its own right, and The Solar Lab lists expansion cost among its main complaints. For a sense of scale, SolarReviews points to the U.S. Energy Information Administration’s figure of about 30kWh of daily use for an average home, and estimates that a two-battery setup with solar could run most homes for a full day. The LFP cells are rated to keep 80% of their capacity after 3,500 cycles.

Charging and Solar Input

From a standard wall outlet, The Solar Lab measured a full charge at 4 hours 4 minutes, drawing about 1,800W, against the roughly 3 hours 20 minutes that charging rate implies. Filling the 6,144Wh battery took 7.25kWh from the wall. Faster input is available: Yahoo Tech saw it go from 20% to 90% in about 90 minutes in its setup.

Solar input tops out at 5,600W across two ports, a 4,000W high-voltage input and a 1,600W low-voltage one. The two 400W panels in this bundle add up to 800W, about a seventh of what the inverter accepts. Even at their full rating they would need close to eight hours of peak output to fill one battery, so treat them as a starter set that slows the drain during a long outage rather than a fast refill. The Solar Lab also counts the 5.6kW ceiling as low once a system grows to several batteries.

Home Integration, Weight and Installation

Plugged in on its own, the DELTA Pro Ultra is a very large power station. Automatic whole-home backup takes EcoFlow’s Smart Home Panel 2, which is sold separately and wired into your electrical panel by an electrician. Yahoo Tech’s installation took around nine hours in total, and it put the electrician’s bill in the low thousands of dollars. The panel handles up to 12 circuits. With the panel, Yahoo Tech reports switchover in a few seconds as standard, and in 20 milliseconds with the EPS (emergency power supply) mode on.

Weight is the other commitment. The inverter is 70 lb and the battery 111.8 lb by EcoFlow’s spec sheet, a little over 180 lb together, and Yahoo Tech notes it climbs close to 300 lb with a second battery. In practice it stays where it is installed. The Solar Lab also points out that it does not work with accessories from the original DELTA Pro. The 5-year warranty is shorter than the 10 years or more SolarReviews says is common for home batteries.

How Does It Stack Up Against the Competition?

The DELTA Pro Ultra leads this group on capacity and solar input and costs the most, and its listed price includes two 400W panels while the rivals are priced as bare units. The others trade some capacity for a single-box design.

Is the EcoFlow DELTA Pro Ultra Worth It?

Buy it if your outage plan includes 240V loads, such as a well pump, central air or an electric dryer, and you want to start with one battery and add more over the years. Budget for the whole system before you buy, not just the box: the Smart Home Panel 2, an electrician, and probably a second battery if you heat with a furnace and lose power in winter. Bought on those terms, it is the most expandable system here and a near-silent way to run 240V appliances through an outage.

Look elsewhere if your needs stop at the fridge, internet, lights and a furnace blower for a day. The DELTA Pro 3 covers that in a single box for far less. If you want the same 7,200W output without the two-piece build, the Jackery Explorer 5000 Plus comes close on capacity at a lower price tier. And if you are counting on solar to carry you through a multi-day outage, plan on adding panels beyond the two in this bundle.

EcoFlow DELTA Pro Ultra

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Marcus WebbSenior Editor 𝕏

Marcus has been hunting for the best tech and gear for over 40 years — as a coder, gamer, and lifelong outdoors enthusiast, he knows the gap between a good spec sheet and something that actually holds up.

How this was made: Researched and written with AI from manufacturer specs, independent tests and published reviews, then checked by automated quality checks. We haven’t tested this product ourselves. How we review →