The 3.6–4kWh flagship battery fight, and it splits on a single spec: 240V. The EcoFlow produces it from one unit — well pumps, transfer switches, dryers all in play — while the Jackery needs a second paralleled unit to get there. If your backup plan is 120V (fridge, electronics, lights, CPAP), the Jackery delivers nearly the same capacity for roughly $700 less in a dramatically lighter package. If 240V is anywhere in the plan, the EcoFlow is the only one-box answer.

Pick the Jackery if…

✓120V-only backup — save ~$700 for the same mission
✓Lightest big battery made; moves like carry-on luggage
✓6,000-cycle cells and the 21kWh expansion ceiling

Pick the EcoFlow if…

✓240V loads from a single unit — well pump, transfer switch
✓Sub-20ms UPS switchover for computers and medical gear
✓2,600W solar input for serious off-grid recharging

Spec by spec

Spec	Jackery HomePower 3600 Plus	EcoFlow DELTA Pro 3
Our score	8.9 / 10	9.2 / 10
Capacity	3,584Wh (LFP, expandable to 21kWh)	4,096Wh (LFP, expandable)
AC output	3,600W continuous (120V; 240V via paired units)	4,000W continuous, 120/240V dual voltage
Outlets	Multiple AC, USB-C, 12V	Multiple AC incl. 240V, USB-C, 12V
Solar input	Up to 1,000W	Up to 2,600W
Cycle life	6,000 cycles	4,000 cycles to 80%
Design	Wheeled, telescoping handle, CTB construction	—
Warranty	5 years	5 years
UPS switchover	—	<20 ms
Weight	—	~115 lb

Still deciding?

Read the full reviews for the complete story, or check both current prices — sale pricing swings this class of decision all the time.

~$1,699 typical price

Buy on Amazon

~$2,399 typical price

Buy on Amazon