EcoFlow DELTA vs DELTA Pro: 1.26 kWh Mid-Box or Expandable Home Battery?

Last updated September 24, 2026. Manufacturer-spec comparison only—not a Boom lab test. Specs from EcoFlow’s original DELTA materials (often labeled DELTA 1300; 1,260 Wh) and the current DELTA Pro US PDP / ecoflow.com/us/delta-pro page. Original DELTA ≠ DELTA 2 / DELTA 3. Real runtime depends on load, temperature, and inverter losses.

Same family name, different eras: the original ~1.26 kWh / 1,800 W mid-station versus the wheeled ~3.6 kWh / 3,600 W home-backup flagship that expands into the tens of kilowatt-hours. Off Grid Power Boom will not flatten that gap into a fake photo-finish.

Index

Quick decision

Pick original EcoFlow DELTA when you want ~1,260 Wh, 1,800 W continuous, six AC outlets, and a ~31 lb mid-box—accepting NMC-class cycle marketing (800+ to 80%+) and no Pro-class expansion / Smart Home Panel story.
Pick DELTA Pro when you need 3,600 Wh base, 3,600 W AC (X-Boost into the ~4,500 W class; dual-unit 7,200 W path), LFP longevity, up to ~1,600 W solar, EV-station / MultiCharge language, and expandability EcoFlow prints toward ~25 kWh with Extra Batteries + Smart Generator kits.

Check EcoFlow DELTA (EcoFlow US) · Check EcoFlow DELTA Pro (EcoFlow US)

Decision table (manufacturer-stated)

Spec	EcoFlow DELTA (original)	EcoFlow DELTA Pro
Capacity	1,260 Wh	3,600 Wh base; EcoFlow prints expandability into the ~3.6–25 kWh class with Extra Batteries / dual units / Smart Generator kits
Continuous AC	1,800 W	3,600 W total (US materials); X-Boost supports higher resistive loads into the ~4,500 W class; two units + Double Voltage Hub path to 7,200 W / 240 V
Surge	3,300 W	7,200 W peak on AC output table
Chemistry / cycles	Lithium-ion (NMC-class); 800+ cycles to 80%+	LFP; 3,500 cycles to 80% / 6,500 cycles to 50% (PDP table)
Max AC input	1,200 W X-Stream; 0–80% in ~1 hour / ~1.6 h full class	1,800 W Max @ 120 V (~2.7 h); 3,000 W Max @ 240 V path (~1.8 h) on US notes; MultiCharge marketing up to ~6,500 W combined methods
Max solar	400 W (10–65 V DC, 10 A max on DELTA materials)	1,600 W Max (11–150 V, 15 A Max)
AC outlets	6× AC (US materials)	5× AC outlets, 3,600 W total (PDP table)
USB-C	USB-C present (confirm live sheet for per-port watts)	2× 100 W Max
Weight	~30.9 lb / ~14 kg	~99 lb / ~45 kg (wheeled handle)
Expandable / home panel	No Pro-class Extra Battery / Smart Home Panel path	Yes — Extra Batteries, Double Voltage Hub, Smart Home Panel / EV-station charging language on EcoFlow materials
Warranty (pages)	Confirm on current EcoFlow listing—do not invent	5-year path cited (3+2 with app registration on current US PDP)

Sources: EcoFlow DELTA, EcoFlow DELTA US marketing, EcoFlow DELTA Pro, EcoFlow DELTA Pro US.

Who should buy / who should skip

Buy original DELTA if…

You want ~1.2 kWh / 1,800 W without rolling a ~99 lb home battery into the garage.
Six AC outlets on a mid-size footprint beat Pro-class expandability for your checklist.

Skip original DELTA if…

You are shopping new LFP mid-size—compare DELTA 2 instead (see RIVER vs DELTA 2); original DELTA is the older NMC-class story.
Multi-day whole-home / RV 30 A Anderson duty is the job—DELTA Pro’s printed ecosystem is the honest lane.

Buy DELTA Pro if…

Arizona outage planning needs kilowatt-hours you can stack, Smart Home Panel / dual-voltage paths, and 3,600 W continuous headroom.

Skip DELTA Pro if…

~99 lb + accessories budget is overkill for camping phones and a mini-fridge—original DELTA or DELTA 2 are the mid-box lane.

Failure modes

Name collision: DELTA ≠ DELTA 2 ≠ DELTA Pro ≠ DELTA Pro Ultra—buy the nameplate.
Wh vs watts: 3.6 kWh at 3,600 W is still roughly an hour at full inverter; size continuous loads first.
Expansion vocabulary: Extra Batteries / Smart Generator / Double Voltage Hub are kit purchases, not free capacity.
Heat + dust: garage installs still need airflow; fans on Pro materials cite ~48–60 dB class at 1 m.