EcoFlow DELTA Pro 3 vs DELTA Pro vs DELTA Pro Ultra: Which Whole-Home Backup Fits Your Panel?

By Ross Calder · Updated 2026-10-26T02:54:05.974Z · How we choose · How we make money

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EcoFlow DELTA Pro 3 Portable Power Station (UL9540 Certificated)

$3099.00 90-day range $3099.00 – $3099.00 trend: flat Lowest price in 90 days

Pros

• 4096 Wh LFP capacity expands up to 48,000 Wh for whole-home backup
• 4000 W output with 120V/240V charging and 12 kW scalability system
• IP65 rating and 4000 cycles to 80% capacity
• 10 ms UPS switchover and 5-year warranty

Cons

• Weighs 113.5 lb, heavy to move
• Costs $140 more than the DELTA Pro

Who it's for: Anyone needing expandable 120V/240V whole-home backup with a rugged IP65 build and long cycle life.

Check price at us.ecoflow.com

EcoFlow DELTA Pro Portable Power Station

$2959.00 90-day range $2959.00 – $2959.00 trend: flat Lowest price in 90 days

Pros

• 3600 Wh LFP capacity with 3600 W output and X-Boost supporting 3600W-4500W devices
• Long cycle life: 6,500 cycles to 50% capacity and 3,500 cycles to 80%
• 15 output ports across AC, USB, car charger, DC5521 and Anderson, with up to 1600W solar input
• Rated 4.9 by users

Cons

• At $2959.00 it is the lowest-priced of the three, but capacity is 3600 Wh versus 4096 Wh on the DELTA Pro 3
• No IP rating or UPS switchover time listed

Who it's for: Anyone wanting a high-rated, long-cycle-life 3600 Wh home backup battery at the lowest current price of the three.

Check price at us.ecoflow.com

EcoFlow DELTA Pro Ultra Whole-Home Backup Power (UL 9540 Certificated)

$4799.00 90-day range $4799.00 – $4799.00 trend: flat Lowest price in 90 days

Pros

• 7200 W output and 21.6 kW scalability system for whole-home 120V/240V backup
• 6144 Wh LFP capacity with 80% capacity after 3,500 cycles
• IP54 rating and operating range of -4°F to 113°F
• 5-year warranty and 4-step professional installation service

Cons

• $4799.00, which is $1700.00 more than the DELTA Pro 3 and $1840.00 more than the DELTA Pro
• Bypass limited to 100-120V~30A total

Who it's for: Anyone needing expandable whole-home 120V/240V backup with high output and professional installation.

Check price at us.ecoflow.com

How we chose

We compared the three units on capacity, output wattage, expandability, UPS switchover, IP rating and current price.

The DELTA Pro 3 lists 4,096 Wh of capacity, expandable to 48,000 Wh, with 4,000 W output, a 10 ms UPS switchover and an IP65 rating. The DELTA Pro Ultra lists 6,144 Wh of base capacity, 7,200 W output and an IP54 rating. The original DELTA Pro lists 3,600 Wh and 3,600 W output.

On price, the DELTA Pro 3 is $3,099.00, the DELTA Pro is $2,959.00, and the DELTA Pro Ultra is $4,799.00. The DELTA Pro 3 costs $140.00 more than the DELTA Pro, and the DELTA Pro Ultra costs $1,700.00 more than the DELTA Pro 3. Each of the three prices is at its 90-day low and has held flat over that range.

Who should skip these

If you rent, or you can't mount equipment or run wiring where you live, these units aren't a practical fit. The DELTA Pro Ultra Whole-Home Backup Power is set up around a 4-step professional installation process, and its battery alone weighs 50.7 kg, so it assumes a permanent install rather than something you move between rooms or take with you when you leave.

The other thing to check before buying is whether your critical loads fit under the output of the unit you're considering. The DELTA Pro 3 Portable Power Station is rated at 4,000 W, the original DELTA Pro Portable Power Station at 3,600 W, and the DELTA Pro Ultra at 7,200 W. If what you need to keep running adds up to more than the unit you're looking at, that unit is the wrong one — the Ultra is the only one of the three rated at 7,200 W.

On price, the DELTA Pro 3 is $3,099.00, the DELTA Pro is $2,959.00, and the DELTA Pro Ultra is $4,799.00. The Ultra costs $1,700.00 more than the DELTA Pro 3 and $1,840.00 more than the DELTA Pro.

How to choose the right one

Start with output. The DELTA Pro 3 delivers 4,000 W, the DELTA Pro Ultra 7,200 W, and the original DELTA Pro 3,600 W. Add up the largest 120V/240V loads you plan to run at once and pick the unit that covers them; the DELTA Pro's X-Boost supports 3600W-4500W devices.

Then size capacity to the hours you need. The DELTA Pro 3 has 4,096 Wh base capacity and expands to 48,000 Wh, with a 12 kW scalability system. The DELTA Pro Ultra starts at 6,144 Wh with a 21.6 kW scalability system. The original DELTA Pro has 3,600 Wh.

Finally, weigh the price gaps against those needs. The DELTA Pro 3 costs $140.00 more than the original DELTA Pro. The DELTA Pro Ultra costs $1700.00 more than the DELTA Pro 3, and $1840.00 more than the original DELTA Pro. All three carry a 5-year warranty.

Questions readers ask

By Ross Calder · Published 2026-09-11 · Updated 2026-10-26