Every EcoFlow Delta Compared: DELTA 2 to Delta Pro Ultra X

Every EcoFlow Delta model compared in one table, from the $449 DELTA 2 to the Delta Pro Ultra X, with a straight recommendation for each use case.

The Short Answer

EcoFlow sells more than a dozen Delta-branded power stations, and the names do not make the hierarchy obvious. This guide puts every current model in one table, explains what separates the tiers, and gives a direct recommendation for each common use case. It also notes the discontinued models you will still see in used listings and older reviews. Prices and specifications are from the Wild Oak Trail product pages as of September 2026.

Every Current EcoFlow Delta at a Glance

All current models use LFP cells. Where a specification is not on the product page we say so rather than estimate.

How to Read the Lineup

Capacity decides how long

Watt-hours is the fuel tank. A 1kWh unit runs a refrigerator for about 15 hours; 2kWh for about 30; 3.6kWh for about two days. Whole-home systems start at 6kWh per battery because a typical house's essential loads are 5 to 10kWh a day. If your question is "how long will it run my stuff," start here.

Output decides what

Watts is the size of the pipe. 1,800W covers plug-in household appliances. 2,400 to 3,600W adds window air conditioners, power tools and multiple kitchen appliances at once. 4,000W with 240V adds well pumps, dryers and ranges. 7,200 to 12,000W runs a whole house including central air. Surge rating matters for motors and compressors that spike at start-up; every model surges to at least 2,700W.

Expansion decides the future

Fixed units, the DELTA 3 Classic and Ultra, are cheaper per watt-hour but what you buy is what you get. Expandable units cost more up front and grow with you. The DELTA 3 Max Plus is the smallest unit that scales to a serious 10kWh; the Delta Pro is the cheapest way to 10.8kWh; the Pro 3 and Ultras are platforms rather than products.

Charging speed is the 2026 differentiator

The DELTA 3 generation refills in about an hour from a wall outlet. The DELTA 2 generation takes closer to two. The Ultras refill from solar in about an hour with a large array. If you use a power station daily or rely on short grid windows, newer is better.

Tier by Tier

1kWh: DELTA 2, DELTA 3 Classic, DELTA 3, DELTA 3 Plus

All four are 1,024Wh, 1,800W units around 27 lbs that you carry in one hand. The DELTA 2 is the previous generation and the value pick at $449. The DELTA 3 Classic ($529) brings new-generation charging and a five-year warranty but does not expand. The DELTA 3 ($629) adds expansion to 5kWh. The DELTA 3 Plus ($699) adds a second solar input, 140W USB-C and a sub-10ms UPS switchover, and is the one most people should buy. Our DELTA 2 guide covers the older unit in depth.

2kWh: DELTA 3 Max, DELTA 3 Max Plus, DELTA 2 Max

Doubling the battery moves you from "keep the fridge going" to "run the kitchen for a day." The DELTA 3 Max ($899) is the newest, lightest and cheapest, with 2,400W, 25dB fans and a fast wall charger but only 500W of solar. The DELTA 3 Max Plus ($1,199) raises output to 3,000W, solar to 1,000W and expansion to 10kWh, and is the best 2kWh platform for growth. The DELTA 2 Max ($1,249) is the previous generation; it still offers 1,000W of solar and expansion to 6,144Wh, and makes sense mainly if you already own its extra batteries.

3 to 4kWh: DELTA 3 Ultra, Delta Pro, DELTA Pro 3

This is the home-backup tier. The DELTA 3 Ultra ($1,499) delivers 3,600W and a 30A outlet from a fixed 3,072Wh battery, the cheapest storage per kWh in the line. The Delta Pro ($1,899) has 3,600Wh, 1,600W of solar and expands to 10.8kWh alone or 25kWh paired; it is the value expandable platform. The DELTA Pro 3 ($2,799) is the successor with 4,096Wh, 4,000W, 120/240V on a single unit, 2,600W of solar and expansion to 48kWh. Read our Delta Pro review for the value case and the Delta Pro Ultra review for the step beyond.

Whole home: Delta Pro Ultra, Delta Pro Ultra X

Both are modular systems: an inverter plus stackable 6kWh-class batteries, connected to the house through a smart home panel installed by an electrician. The Delta Pro Ultra offers 7,200W, 5.6kW of solar and up to 90kWh. The Delta Pro Ultra X raises that to 12kW, 10kW of solar and 184kWh, and adds weather-aware pre-charging. Two batteries, 12.2kWh, run a typical home's essentials for about a day; five run a whole home for a day. Our home battery backup guide explains sizing.

Permanent installs: Power Kits

For vans, RVs and off-grid cabins that want a fixed system rather than a portable unit, EcoFlow's Power Kits in 2, 4, 5, 10 and 15kWh sizes ($4,747 to $16,999) are a separate line built for that job.

Recommendations by Use Case

Use case	Recommendation	Why
Weekend camping, tailgating	DELTA 3 Plus, or DELTA 2 on a budget	27 lbs, runs fridge, lights and devices for days, dual solar on the Plus
Home office UPS	DELTA 3 Plus or DELTA 3 Max	Sub-10ms switchover, quiet, doubles as outage power
Short outages, fridge and router	DELTA 3 Max	30 hours of fridge, 2,400W for the kitchen, $899
RV and trailer	DELTA 3 Max Plus or DELTA 3 Ultra	3,000 to 3,600W for microwave and AC; Ultra has a 30A outlet
Multi-day outages, essentials	Delta Pro with extra batteries	10.8kWh for $4,300; 1,600W solar keeps it full
Well pump, dryer, 240V loads	DELTA Pro 3	240V from one unit, 4,000W, expands to 48kWh
Off-grid cabin or tiny home	Delta Pro + 2 batteries + 1,600W solar, or a Power Kit	Portable system that refills in an afternoon, or a fixed install
Whole-home, hands-off backup	Delta Pro Ultra X, 2+ batteries	12kW, under 10ms switchover, scales to 184kWh
Job site tools	DELTA 3 Max Plus or DELTA 3 Ultra	6,000 to 7,200W surge starts saws and compressors

Discontinued Models You Will Still See

• Delta 1300 (original Delta): 1,260Wh, 1,800W, nickel-based cells rated for about 800 cycles. Replaced by the DELTA 2. Still a usable unit but its battery chemistry is the weak point in used listings.
• Delta Max: 2,016Wh, 2,400W, expandable to about 6kWh with Delta Max extra batteries. Replaced by the DELTA 2 Max and then the DELTA 3 Max. Its extra batteries remain compatible with the DELTA 2, DELTA 2 Max, DELTA 3 and DELTA 3 Plus. Our Delta Max vs Delta Mini article covers it.
• Delta Mini: 882Wh, 1,400W, the smallest Delta. Replaced in practice by the River series and the DELTA 3 Classic.
• River series: EcoFlow's sub-1kWh line for backpacking and day trips. Not covered here; see the EcoFlow collection for current River models.

Extra Batteries Across Generations

EcoFlow's extra batteries are more cross-compatible than the model names suggest. DELTA 2, DELTA 2 Max, DELTA 3 and DELTA Pro 3 extra batteries all work with the DELTA 3 and DELTA 3 Plus. Delta Pro Smart Extra Batteries work with the Delta Pro and the DELTA Pro 3. The Ultras use their own 6kWh modules. Before buying an extra battery, check our expansion battery guide for the current compatibility matrix.

Every model in this guide is stocked at Wild Oak Trail with solar and battery bundles. Browse the EcoFlow collection, or call or chat with our team to match a unit to your loads. We price match.

Frequently Asked Questions

Which EcoFlow Delta is best for home backup?

For essentials through a day or two, the Delta Pro with one or two Smart Extra Batteries is the best value. For 240V loads such as a well pump or dryer, the DELTA Pro 3. For whole-home backup with automatic switchover, the Delta Pro Ultra X with two or more batteries.

What is the difference between EcoFlow DELTA 3 and Delta Pro?

The DELTA 3 is a 1,024Wh, 1,800W, 27 lb unit for camping and short outages. The Delta Pro is a 3,600Wh, 3,600W, 99 lb unit on wheels for home backup that expands to 10.8kWh. They are different classes of product; the DELTA 3 Ultra at 3,072Wh and 3,600W is the model closest to the Delta Pro in the new generation.

Which EcoFlow is the best value?

Per kilowatt-hour, the DELTA 3 Ultra at about $488 per kWh and the DELTA 2 at about $438 per kWh. For expandable home backup, the Delta Pro at $1,899 for 3.6kWh with expansion to 10.8kWh is the strongest value.

Is the EcoFlow DELTA 3 Max better than the DELTA 2 Max?

The DELTA 3 Max is newer, lighter, quieter, cheaper and charges faster, but takes only 500W of solar. The DELTA 2 Max takes 1,000W of solar and expands to 6,144Wh. Buy the DELTA 3 Max unless solar input is your priority, in which case the DELTA 3 Max Plus matches the DELTA 2 Max's 1,000W and adds 3,000W output and 10kWh expansion.

Can EcoFlow Delta models power a whole house?

The Delta Pro Ultra and Delta Pro Ultra X can, connected through a smart home panel. The Ultra X delivers 12kW and runs central air, a well pump and a kitchen at once, with two batteries covering essentials for about a day. Smaller Deltas run selected circuits or plug-in appliances, not a whole house.

Do EcoFlow extra batteries work across models?

Largely, yes. DELTA 2, DELTA 2 Max, DELTA 3 and DELTA Pro 3 extra batteries all work with the DELTA 3 and DELTA 3 Plus. Delta Pro Smart Extra Batteries work with the Delta Pro and DELTA Pro 3. The Ultras use dedicated 6kWh modules. Check the expansion battery guide before buying.