OUPES Mega 1 vs EcoFlow DELTA 3 Classic: Budget UPS Showdown 2026

Short answer: The EcoFlow DELTA 3 Classic ($449) wins on brand trust, warranty, and ecosystem. The OUPES Mega 1 ($399) wins on raw specs per dollar — 4,500W surge vs 3,600W, expandable to 5.12kWh, same UPS. If you need expansion or higher surge, OUPES. If you want EcoFlow’s ecosystem and service, DELTA 3 Classic.

Specs Comparison

Spec	OUPES Mega 1	EcoFlow DELTA 3 Classic
Capacity	1,024Wh	900Wh
Continuous output	2,000W	1,800W
Surge	4,500W ✓	3,600W
UPS switchover	<20ms ✓	<30ms ✓
Solar input	1,000W	500W
Expandable	To 5.12kWh ✓	No
Battery type	LFP	LFP
Warranty	5 years	5 years
Weight	26.5 lbs	22 lbs
Price	$399	$449

CPAP Compatibility

Both generators pass the CPAP test. OUPES Mega 1 at under 20ms and EcoFlow DELTA 3 Classic at under 30ms — both fast enough for CPAP and BiPAP machines. The OUPES has a slight edge for medical devices requiring the tightest switchover tolerances.